Part I - Anticipatory Grief: Experiencing grief before the loss has happened
BIOMOLECULES MCQ.docx
1. BIOMOLECULES
Q1) Which one of the following statements is correct, with reference to
enzymes? (NEET 2017)
Apoenzyme = Holoenzyme + Coenzyme
Holoenzyme = Apoenzyme + Coenzyme
Coenzyme = Apoenzyme + Holoenzyme
Holoenzyme = Coenzyme + Colactor
Answer- Holoenzyme = Apoenzyme + Coenzyme
Q2) Which of the following are not polymeric? (NEET 2017)
Nucleic acid
Proteins
Polysaccharides
Lipids
Answer- Lipids
Q3) A typical fat molecule is made up of (NEET 2016, PHASE I)
One glycerol & three fatty acid molecules
One glycerol & one fatty acid molecule
Three glycerol & three fatty acid molaecules
Three glycerol molecules & one fatty acid molecule
Answer- One glycerol & one fatty acid molecule
Q4) Which one of the following statements is wrong? (NEET 2016, PHASE I)
Cellulose is a polysaccharide
Uracil is a pyrimidine
Glycine is a sulphur containing amino acid
Sucrose is a disaccharide
Answer- Glycine is a sulphur containing amino acid
Q5) Which of the following describes the given graph correctly? (NEET 2016,
2. PHASE II)
Endothermic reaction with energy A in the presence of enzyme & B in the absence of
enzyme
Exothermic reaction with energy A in the presence of enzyme & B in the absence of
enzyme
Endothermic reaction with energy A in the absence of enzyme & B in the presence
of enzyme
Exothermic reaction with energy A in the absence of enzyme & B in the presence of
enzyme
Answer- Exothermic reaction with energy A in the presence of enzyme & B in
the absence of enzyme
3. Q6)Which of the following is the least likely to be involved in stabilising the
three-dimensional folding of most proteins? (NEET 2016, PHASE II)
Hydrogen bonds
Electrostatic interaction
Hydrophobic interaction
Ester bonds
Answer- Ester bonds
Q7) A non-proteinaceous enzyme is (NEET 2016, PHASE II)
Lysozyme
Ribozyme
Ligase
Deoxyribonuclease
Answer- Ribozyme
Q8) The chitinous exoskeleton of arthropods is formed by the polymerisation
of (CBSE AIPMT 2015)
Keratin sulphate & chondroitin sulphate
D-glucosamine
N-acetyl glucosamine
Lipoglycans
Answer- D-glucosamine
Q9) Which of the following biomolecules does have a phosphodiester
bond? (CBSE AIPMT 2015)
Fatty acids in a diglyceride
Monoscchrides in a polysaccharide
Amino acids in a polypeptide
Nucleic acids in a nucleotide
Answer- Nucleic acids in a nucleotide
4. Q10) Which one of the following is a non-reducing carbohydrate? (CBSE
AIPMT 2014)
Maltose
Sucrose
Lactose
Ribose 5-phosphate
Answer- Sucrose
Q11) Select the option which is not correct with respect to enzyme
action. (CBSE AIPMT 2014)
Substrate binds with enzyme as its active site.
Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase
by malonate
A non- competitive inhibitor binds the enzyme at a site distinct from that which binds
the substrate
Malonate is a competititve inhibitor of succinic dehydrogenase
Answer- Addition of lot of succinate does not reverse the inhibition of succinic
dehydrogenase by malonate
Q12) Transition state structure of the substrate formed during an enzymatic
reaction is (NEET 2013)
Transient but stable
Permanent but unstable
Transient & unstable
Permanent & stable
Answer- Transient & unstable
Q13) The essential chemical components of many coenzymes are (NEET 2013)
Proteins
Nucleic acids
Carbohydrates
Vitamins
Answer- Vitamins
5. Q14) A phosphoglyceride is always made up of (NEET 2013)
Only a saturated fatty acid esterified to a glycerol molecule to which a phosphate
group is also attached
Only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate
group is also attached
A saturated or unsaturated fatty acid esterified to glycerol molecule to which a
phosphate group is also attached
A saturated or unsaturated fatty acid esterified to a phosphate group which is also
attached to a glycerol molecule
Answer- A saturated or unsaturated fatty acid esterified to glycerol molecule to
which a phosphate group is also attached
Q15) Macromolecule chitin is (NEET 2013)
Nitrogen containing polysaccharide
Phosphorous containing polysaccharide
Sulphur containing polysaccharide
Simple polysaccharide
Answer- Nitrogen containing polysaccharide
Q16) Given below is the diagrammatic representation of one of the categories od
small molecular weight organic compounds in the living tissues. Identify the category
shown & the one blank component X in it.
Category Component
Cholestrol – Guanine
6. Amino acid – NH₂
Nucleotide – Adenine
Nucleoside – Uracil
Answer- Nucleoside – Uracil
Q17) Which one is the most abundant protein in the animal world? (CBSE
AIPMT 2012)
Trypsin
Haemoglobin
Collagen
Insulin
Answer- Collagen
Q18) Which one out of A-D given below correctly represents the structural
formula of the basic amino acid? (CBSE AIPMT 2012)
C
D
A
B
Answer- D
Q19) The curve given below shows enzymatic activity with relation to three
conditions (pH, temperature & substrate concentration) (CBSE AIPMT 2011)
7. What do the two axis (X & Y) represent?
X-axis Y-axis
Temperature – Enzyme activity
Substrate concentration – Enzymatic activity
Enzymatic activity – Temperature
Enzymatic activity – Ph
Answer- Temperature – Enzyme activity
Q20) Which one of the following structural formula of two organic compounds
is correctly identified along with its related function? (CBSE AIPMT 2011)
8. A- Triglyceride major – Source of energy
B – Uracil – A component of DNA
A- Lecithin – A component of cell membrane
B- Adenine – A nucleotide that makes up nucleic acids
Answer- A- Lecithin – A component of cell membrane
Q21) Which one of the following is the correct matching of three items & their
grouping category? (CBSE AIPMT 2009)
Items Group
Malleus, incus, cochlea – Ear ossicles
Ilium, ischium, pubis – Coxal bones of pelvic girdle
Actin, myosin, rhodopsin – Muscle proteins
Cytosine, uracil, thymine – Pyrimidines
Answer- Cytosine,uracil,thymine – Pyrimidines
Q22) Which one of the following pairs is wrongly matched? (CBSE AIPMT
2009)
Detergents – Lipase
9. Alcohol – Nitrogenase
Fruit juice – Pectinase
Textile- Amylase
Answer- Alcohol- Nitrogenase
Q23) In the DNA molecule (CBSE AIPMT 2008)
The total amount of purine nucleotides & pyrimidine nucleotides is not always equal
There are two strands which run parallel in the 5’→3’ direction
The proportion of adenine in relation to thymine varies with the organism
There are two strands which run antiparallel one in 5’→3’ direction & other in 3’→5’
Answer- There are two strands which run antiparallel one in 5’→3’ direction &
other in 3’→5’
Q24) Which one of the following pairs of nitrogenous bases of nucleic acids, is
wrongly matched with the category mentioned against it? (CBSE AIPMT 2008)
Thymine, Uracil – Pyrimidines
Uracil, Cytosine – Pyrimidines
Guanine, Adenine – Purines
Adenine, Thymine – Purines
Answer- Adenine, Thymine – Purines
Q25) Modern detergents contain enzyme preparation of (CBSE AIPMT 2008)
Acidophiles
Alkaliphiles
Thermoacidophiles
Thermophiles
Answer- Alkaliphiles
Q26) A competitive inhibitor of succinic dehydrogenase is (CBSE AIPMT 2008)
Malonate
Oxaloacetate
α-ketoglutarate
10. Malate
Answer- Malonate
Q27) Which one of the following is not a constituent of cell membrane? (CBSE
AIPMT2007)
Cholesterol
Glycolipids
Proline
Phospholipids
Answer- Proline
Q28) The two polynucleotide chains in DNA are (CBSE AIPMT 2007)
Parallel
Discontinuous
Antiparallel
Semiconservative
Answer- Antiparallel
Q29) About 98% of the mass of every living organism is composed of just six
elements including carbon, hydrogen, nitrogen, oxygen & (CBSE AIPMT 2007)
Phosphorous & sulphur
Sulphur & magnesium
Magnesium & sodium
Calcium & phosphorous
Answer- Phosphorous & sulphur
Q30) One turn of the helix in a B-form DNA is approximately? (CBSE AIPMT
2006)
0.34nm
3.4nm
2nm
20nm
11. Answer- 3.4nm
Q31) Antibodies in our body are complex (CBSE AIPMT 2006,2000)
Steroids
Prostaglandins
Glycoproteins
Lipoproteins
Answer- Glycoproteins
Q32) Antiparallel strands of a DNA molecule means that (CBSE AIPMT 2006)
The phosphate groups of two DNA strands, at their ends, share the same position
The phosphate groups at the start of two DNA strands are in opposite position (pole)
One strand turns clockwise
One strand turns anti-clockwise
Answer- The phosphate groups at the start of two DNA strands are in opposite
position (pole)
Q33) An organic substance bound to an enzyme & essential for its activity is
called (CBSE AIPMT 2006)
Holoenzyme
Spoenzyme
Isoenzyme
Coenzyme
Answer- Coenzyme
Q34) An enzyme that can stimulate germination of barley seeds is (CBSE
AIPMT 2006)
α-amylase
lipase
protease
invertase
Answer- α-amylase
12. Q35) Nucleotides are building blocks of nucleic acids. Each nucleotide is a
composite molecule formed by (CBSE AIPMT 2005, 1991)
base-sugar-phosphate
base-sugar-OH
(base-sugar-phosphate)n
Sugar-phosphate
Answer- Base-sugar-phosphate
Q36) Which of the following is the simplest amino acid? (CBSE AIPMT 2005)
Alanine
Asparagine
Glycine
Tyrosine
Answer- Glycine
Q37) Which one of the following hydrolyses internal phosphodiester bonds in
a polynucleotide chain? (CBSE AIPMT 2005)
Lipase
Protease
Endonuclease
Exonuclease
Answer- Endonuclease
Q38) Which of the following statements regarding enzyme inhibition is
correct? (CBSE AIPMT 2005)
Competitive inhibition is seen when a substrate competes with an enzyme for
binding to an inhibitor protein
Competitive inhibition is seen when the substrate & the inhibitor compete for the
active site on the enzyme
Non-competitive inhibition of an enzyme can be overcome by adding large amount of
substrate
Non-competitive inhibitors bind to the enzyme irreversibly
Answer-Non-competitive inhibition of an enzyme can be overcome by adding
large amount of substrate
13. Q39) Enzymes, vitamins & hormones can be classified into a single category
of biological chemicals, because all of these (CBSE AIPMT 2005)
Help in regulating metabolism
Are exclusively synthesised in the body of a living organism as at present
Are conjugated proteins
Enhance oxidative metabolism
Answer- Help inregulating metabolism
Q40) The catalytic efficiency of two different enzymes can be compared by
the (CBSE AIPMT 2005)
Formation of the product
pH optimum value
Km value
Molecular size of the enzyme
Answer- Km value
Q41) The most abundant element present in plants is (CBSE AIPMT 2004)
Carbon
Nitrogen
Manganese
Iron
Annswer- Carbon
Q42) Which form of RNA has a structure resembling clover leaf? (CBSE AIPMT
2004)
rRNA
hnRNA
c)mRNA
d)tRNA
Answer- tRNA
Q43) The major portion of the dry weight of plants comprises of (CBSE AIPMT
14. 2003)
carbon, nitrogen & hydrogen
carbon, hydrogen & oxygen
nitrogen, phosphorous & potassium
calcium, magnesium & sulphur
Answer- Carbon, hydrogen & oxygen
Q44) Collagen is (CBSE AIPMT 2002)
fibrous protein
globular protein
lipid
carbohydrate
Answer- Fibrous protein
Q45) Lipids are insoluble in water because lipid molecules are (CBSE AIPMT
2002)
hydrophilic
hydrophobic
neutral
Zwitter ions
Answer- Hydrophobic
Q46) Which of the following is a reducing sugar? (CBSE AIPMT 2002)
Galactose
Gluconic acid
β-methyl galactoside
sucrose
Answer- Galactose
Q47) Which steroid is used for transformation? (CBSE AIPMT 2002)
cortisol
cholesterol
testosterone
15. progesterone
Answer- Cholestrol
48) Hydrolytic enzymes which act at low low pH are called as (CBSE AIPMT
2002)
proteases
α-amylase
hydrolases
peroxidises
Answer- Hydrolases
Q49) Most abundant organic compound on earth is (CBSE AIPMT 2001, 04)
protein
cellulose
lipids
steroids
Answer- Cellulose
Q50) Spoilage of oil can be detected by which faty acid? (CBSE AIPMT 2001)
Oleic acid
Linolenic acid
Linoleic acid
Erucic acid
Answer- Erucic acid
Q51) Cytochrome is (CBSE AIPMT 2001)
Metallo flavoprotein
Fe containing porphyrin pigment
Glycoprotein
Lipid
Answer- Fe containing porphyrin pigment
16. Q52) Element necessary for the middle lamella (CBSE AIPMT 2001)
Ca
Zn
K
Cu
Answer- Ca
Q53) In plants, inulin & pectin are (CBSE AIPMT 2001)
Reserve materials
Wastes
Excretory material
Insect-attracting material
Answer- Reserve material
Q54) Conjugated proteins containing carbohydrates as prosthetic group are
known as (CBSE AIPMT 2000)
Chromoproteins
Glycoproteins
Lipoproteins
Nucleoproteins
Answer- Glycoproteins
Q55) The transfer RNA molecule in 3D appears (CBSE AIPMT 2000)
L-shaped
E-shaped
Y-shaped
S-shaped
Answer- L-shaped
Q56) Enzymes enhance the rate of reaction by (CBSE AIPMT 2000)
Forming a reactant-product complex
Changing the equilibrium poin of the reaction
Combining with the product as soon as it is formed
17. Lowering the activation energy of the reaction
Answer- Lowering the activation energy of the reaction
Q57) Feedback inhibition of an enzymatic reaction is caused by (CBSE AIPMT
2000)
End product
Substrate
Enzyme
Rise in temperature
Answer- End product
Q58) One of the similarities between DNA & RNA is that both (CBSE AIPMT
2000)
Are polymers of nucleotides
Are capable of replicating
Have similar sugars
Have similar pyrimidine bases
Answer- Are polymers of nucleotides
Q59) Which is an essential amino acid? (CBSE AIPMT 2000)
Serine
Aspartic acid
Glycine
Phenylalanine
Answer- Phenylalanine
Q60) ATP is a (CBSE AIPMT 2000)
Nucleotide
Nucleosome
Nucleoside
Purine
Answer- Nucleotide
18. 1. This is a correct statement with reference to enzymes (NEET 2017)
A. Holoenzyme = Coenzyme + Co-factor
B. Holoenzyme = Apoenzyme +Coenzyme
C. Apoenzyme = Holoenzyme +Coenzyme
D. Coenzyme = Apoenzyme + Holoenzyme
2. This is a non-proteinaceous enzyme (NEET – II 2016)
A. deoxyribonuclease
B. ligase
C. Ribozyme
D. lysozyme
3. This from the following is least likely to be involved in stabilizing the three-dimensional
folding of most of the proteins (NEET – II 2016)
A. Hydrophobic interaction
B. Electrostatic interaction
C. Hydrogen bonds
D. Ester bonds
4. Pick the incorrect statement (NEET – I 2016)
A. Sucrose is a disaccharide
B. Uracil is a pyrimidine
C. Glycine is a sulphur containing amino acid
D. Cellulose is a polysaccharide
5. The chitinous exoskeleton of arthropods is formed by the polymerization of (2015)
A. D-glucosamine
B. lipoglycans
C. N – acetyl glucosamine
D. keratin sulphate and chondroitin sulphate
6. This biomolecule has a phosphodiester bond (2015)
A. fatty acids in a diglyceride
B. amino acids in a polypeptide
C. monosaccharides in a polysaccharide
D. nucleic acids in a nucleotide
7. Pick the incorrect statement with regards to enzyme action (2014)
A. Malonate is a competitive inhibitor of succinic dehydrogenase
B. Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by
malonate
C. substrate binds with enzyme at its active site
19. D. a non-competitive inhibitor binds the enzyme at a site distinct from that which binds the
substrate
8. Macromolecule chitin is (NEET 2013)
A. Nitrogen-containing polysaccharide
B. phosphorous-containing polysaccharide
C. sulphur containing polysaccharide
D. simple polysaccharide
9. This about enzymes is incorrect (NEET 2013)
A. enzymes are highly specific
B. enzymes are denatured at high temperatures
C. enzymes require optimum pH and temperature for maximum activity
D. enzymes are mostly proteins but some are lipids also
10. This biomolecule is correctly characterized (Mains 2012)
A. Alanine amino acid – contains an amino group and an acidic group anywhere in the molecule
B. Palmitic acid – an unsaturated fatty acid with 18 carbon atoms
C. Lecithin – a phosphorylated glyceride found in the cell membrane
D. Adenylic acid – adenosine with a glucose phosphate molecule
Question Answer Key
1 B
2 C
3 D
4 C
5 C
6 D
7 B
8 A
9 D
10 C
20. question_answer (1)
In fructose the possible optical isomers are
A)
12
B)
8
C)
16
D)
4
question_answer2)
Glucose molecule reacts with X number of molecules of phenylhydrazine to yield
osazone. The value of X is
A)
three
B)
two
C)
one
D)
four
question_answer3)
Which L-sugar on oxidation gives an optically active dibasic acid (2 COOH
groups)?
A)
B)
C)
21. D)
question_answer4)
In cells the net production of ATP molecules generated from one glucose molecule
is
A)
46
B)
32
C)
36
D)
40
question_answer5)
Which is correct statement?
A)
Starch is a polymer of
α
-glucose
B)
In cyclic structure of fructose, there are four carbons and one oxygen atom
C)
Amylose is a component of cellulose
D)
Proteins are composed of only one type of amino acids
question_answer6)
Vitamin D is also known as
A)
22. sunshine vitamin
B)
ascorbic acid
C)
growth vitamin
D)
reproductive vitamin
question_answer7)
Night blindness is caused by deficiency of
A)
vitamin
B12
B)
vitamin A
C)
vitamin C
D)
vitamin E
question_answer8)
The hormone which controls the processes of burning of fats, proteins and
carbohydrates to liberate energy in the body is
A)
cortisone
B)
adrenaline
C)
thyroxine
D)
insulin
question_answer9)
Two vitamins absorbed from intestine along with fast are
A)
A, D
B)
A, B
23. C)
A, C
D)
D, B
question_answer10)
Which one of the following is an amine hormone?
A)
Thyroxine
B)
Oxypurin
C)
Insulin
D)
Progesterone
question_answer11)
Complete hydrolysis of starch gives:
A)
glucose only
B)
galactose and fructose in equimolar amounts
C)
glucose and galactose in equimolar amounts
D)
glucose and fructose in equimolar amounts
question_answer12)
Accumulation of which of the following molecules in the muscles occurs as a
result of vigorous exercise?
A)
Glycogen
B)
Glucose
C)
Pyruvic acid
D)
L-lactic acid
24. question_answer13)
Which of the following will not show mutarotation?
A)
Maltose
B)
Lactose
C)
Glucose
D)
Sucrose
question_answer14)
An organic compound with the formula C6H12O6 forms a yellow crystalline solid
with phenylhydrazine and gives a mixture of sorbitol and mannitol when reduced
with sodium. Which among the following could be the compound?
A)
fructose
B)
glucose
C)
mannose
D)
sucrose
question_answer15)
When α-D-glucose and β -D-glucose are dissolved in water in two separate
beakers I and II respectively and allowed to stand, then -
A)
specific rotation in beaker I will decrease while in II will increase upto a
constant value
B)
the specific rotation of equilibrium mixture in two beakers will be different
C)
the equilibrium mixture in both beakers will be leavorotatory
D)
the equilibrium mixture in both beakers will contain only cyclic form of
glucose
question_answer16)
25. The pK4 values for the three ionizable groups X, Y and Z of glutamic acid are 4.3,
9.7 and 2.2 respectively
HO2CX−CH2−C|+NH3HY−CO2HZ
The isoelectric point for the amino acid is:
A)
7.00
B)
3.25
C)
4.95
D)
5.95
question_answer17)
A vitamin that contains both N and P is
A)
Vitamin C
B)
Vitamin K
C)
Vitamin B12
D)
Vitamin D
question_answer18)
Match List I (name of vitamin) with List II (deficiency result/disease) and select the
correct answer using the codes given below the lists:
List I List II
I. Ascorbic acid A. Beri-beri
II. Retinol B. Cracked lips
III. Riboflavin C. Scurvy
IV. Thiamine D. Night blindness
A)
I-B, II-A, III-C, IV-D
B)
I-A, II-B, III-C, IV-D
C)
I-D, II-C, III-B, IV-A
D)
26. I-C, II-D, III-B, IV-A
question_answer19)
Nucleotides in DNA are linked by -
A)
hydrogen bond
B)
3', 5'-phosphodiester bond
C)
glycosidic bond
D)
peptide bond
question_answer20)
If one strand of DNA has the sequence ATGCTTGA, the sequence in the
complimentary strand would be
A)
TACGAACT
B)
TCCGAACT
C)
TACGTACT
D)
TACGTAGT
question_answer21)
Which of the following pairs can be distinguished by Fehling's solution?
A)
Glucose and fructose
B)
Glucose and sucrose
C)
Methanal and ethanol
D)
Hydroxypropanone and benzaldehyde.
question_answer22)
27. Which of the following statement(s) is (are) true?
(i) All amino acids contain one chiral center.
(ii) Some amino acids contain one, while some contain more chiral center or
even no chiral center.
(iii) All amino acids found in proteins have L configuration.
(iv) All amino acids found in proteins have
1∘
amino group.
A)
(ii), (iii) & (iv)
B)
(ii) & (iii)
C)
(i), (iii) & (iv)
D)
(i) & (iv).
question_answer23)
In osazone formation, glucose reacts with three molecules of phenylhydrazine.
Which statement is true regarding this?
A)
All the three molecules react in similar fashion
B)
Two molecules react in similar manner, while the third reacts in different way
C)
All the three molecules react in different ways
D)
None of the above is true
question_answer24)
Natural glucose is termed D-glucose because:
A)
−OH on the second carbon is on the right side in Fischer projection
B)
−OH on the sixth carbon is on the right side in Fischer projection.
C)
−OH on the fifth carbon is on the right side in Fischer projection.
D)
It is dextrorotatory.
28. question_answer25)
Which of the following statement is not correct?
A)
Amylopectin is a branched polymer of α- glucose.
B)
Cellulose is a linear polymer of β-glucose
C)
Glycogen is the food reserve of plants
D)
All proteins are polymers of α- amino acids.
question_answer26)
Amylopectin is a polymer of
A)
α−D-glucose
B)
amino acid
C) β−D- glucose
D)
amylase.
question_answer27)
Which of the following is a non-reducing sugar?
A)
Lactose
B)
Fructose
C)
Sucrose
D)
Maltose
question_answer28)
Glycosidic linkage is actually an:
A)
Carbonyl bond
29. B)
Ether bond
C)
Ester bond
D)
Amide bond
question_answer29)
Which of the following does not reduce Benedict's solution?
A)
Glucose
B)
Fructose
C)
Sucrose
D)
Aldehyde
question_answer30)
Hydrolysis of sucrose is called
A)
hydration
B)
saponification
C)
esterification
D)
inversion
question_answer31)
Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at
pH 1.0, which of the following species will predominate?
A)
H3N+C|RHCO2H
B)
H2NC|RHCO2H
C)
H3N+C|RHCO2
30. D)
H2NC|RHCO−2
question_answer32)
A mixture of two amino acids having pI 9.60 and 5.40 can be separated
A)
by adjusting the pH of the solution at 9.60
B)
by adjusting the pH of the solution at 4.20
C)
by adjusting the pH of the solution at 7.0
D)
by adjusting the pH of the solution at 7.5.
question_answer33)
The correct statement in respect of protein haemoglobin is that it
A)
acts as an oxygen carrier in the blood
B)
forms antibodies and offers resistance to diseases
C)
enzymes are specific biological catalysts that can normally function at very
high temperature (T ~1000K)
D)
enzymes are specific biological catalysts that possess well-defined active
sites
question_answer34)
Which of the following carbohydrates is not related to (+)-glucose?
A)
Amylopectin
B)
Amylose
C)
Inulin
D)
Glycogen
31. question_answer35)
What will happen when D-(+)-glucose is treated with methanolic −HCl followed by
Tollens' reagent?
A)
A black ppt. will be formed
B)
A red ppt. will be formed
C)
A green colour will appear
D)
No characteristic colour or ppt. will be formed.
question_answer36)
Glucose-D has a great tendency to be converted into cyclic isomer. Which two
carbon atoms get joined through 'O' to form this hemiacetal?
A)
C1 and C4
B)
C1 and C5
C)
C1 and C6
D)
C2 and C6
question_answer37)
Among the three compounds shown below, two yield the same product on
reaction with warmHNO3. The exception is:
A)
B)
32. C)
D)
None of these
question_answer38)
The enantiomer of α−D−(+)-glucose is
A)
β−D−(+)-glucose
B)
α−D−(−) -glucose
C)
α−L−(−)-glucose
D)
β−L−(−)-glucose.
question_answer39)
Compounds I and II may be grouped as
A)
diastereomers
B)
epimers
C)
C-2 epimers
D)
all of the three.
33. question_answer40)
Which of the following evolves carbon dioxide, on oxidation with periodate?
A)
B)
C)
Both
D)
None
question_answer41)
Imino acid among these compounds is
A)
serine
B)
proline
C)
tyrosine
D)
lysine
question_answer42)
Which amino acid is achiral?
A) alanine
B)
valine
C)
proline
D)
34. None of these
question_answer43)
Which is not a true statement?
A)
α-carbon of α-amino acid is asymmetric
B)
All proteins are found in L-form
C)
Human body can synthesize all proteins they need
D)
At pH = 7 both amino acids and carboxylic groups exist in the ionised form
question_answer44)
Which of the following is a steroid hormone?
A)
Cholesterol
B)
Adrenaline
C)
Thyroxine
D)
Progesterone
question_answer45)
Vitamin B6 is known as
A)
pyridoxine
B)
thiamine
C)
tocopherol
D)
riboflavin
question_answer46)
A sequence of how many nucleotides in messenger RNA makes a codon for an
amino acid?
35. A)
Three
B)
Four
C)
One
D)
Two
question_answer47)
The process by which synthesis of protein takes place based on the genetic
information present in m-RNA is called
A)
Translation
B)
Transcription
C)
Replication
D)
Messenger hypothesis
question_answer48)
Which of the following substances is not present in nucleic acids?
A)
Cytosine
B)
Adenine
C)
Thymine
D)
Guanidine
question_answer49)
Which of the following is not present in a nucleotide?
A)
Guanine
B)
Cytosine
36. C)
Adenine
D)
Tyrosine
question_answer50)
Iso-electric point of alanine is (pH = 6). At which pH, maximum concentration of
zwitter ion of alanine will be present?
A)
pH>6
B)
pH<6
C)
pH=6
D)
pH=7
question_answer51)
H−C≡C−H−→−−−H2SO4HgSO4(A)
−→−−−−−−−−(2)H3O+(1)NH3+HCN(B);
Product [B] of given reaction is:
A)
Glycine
B)
Alanine
C)
valine
D)
Leucine
question_answer52)
The dipeptide, Gly. Ala has structure -
A)
H3N+CH2C||ONHC|CH3HCO¯2
B)
H3N+C|CH3HC||ONHCH2CO−2
C)
O−2CC|CH3HNH−C||O−CH2N+H3
37. D)
O−2CCH2NH−C||OC|CH3HN+H3
question_answer53)
All of the following statements apply to proteins except
A)
Proteins generally have no definite melting point
B)
Proteins contain the grouping -CONH-
C)
Proteins have high molecular weight
D)
Proteins can only contain the elements C, H, O and N.
question_answer54)
The reason for double helical structure of DNA is the operation of:
A)
Electrostatic attractions
B)
van der Waals forces
C)
Dipole - Dipole interactions
D)
Hydrogen bonding
question_answer55)
Among the following organic acids, the acid present in rancid butter is:
A)
Pyruvicacid
B)
Lactic acid
C)
Butyric acid
D)
Acetic acid
question_answer56)
Which of the following enzyme converts starch into maltose?
38. A)
Diastase
B)
Maltase
C)
Zymase
D)
Invertase
question_answer57)
Which statement is incorrect about peptide bond?
A)
C-N bond length in proteins is longer than usual C-N bond length
B)
Spectroscopic analysis shows planar structure of −C||O−NH− bond
C)
C-N bond length in proteins is smaller than usual C-N bond length
D)
None of these
question_answer58)
D−(+)−Glucose −→−−−−−−5(CH3CO)2OD−(+)−Glucose
pentaacetate Which statement is true about glucose pentaacetate?
A)
It will react with phenylhydrazine but not with Tollens' reagent.
B)
It will react with Tollens' reagent but not with phenylhydrazine.
C)
It will react with both of the above mentioned reagents.
D)
It will react neither with phenylhydrazine nor with Tollens' reagent.
question_answer59)
Which of the following structures represents thymine?
A)
39. B)
C)
D)
question_answer60)
Among the following vitamins the one whose deficiency causes rickets (bone
deficiency) is
A)
Vitamin A
B)
Vitamin B
C)
Vitamin D
D)
Vitamin C
A)
Three
B)
Four
C)
Five
D)
Six
question_answer2)
40. The nucleic acid base having two possible binding sites is [AIIMS 2004]
A)
Thymine
B)
Cytosine
C)
Guanine
D)
Adenine
question_answer3)
Subunits present in hemoglobin are [AIIMS 2003]
A)
2
B)
3
C)
4
D)
5
question_answer4)
A sequence of how many nucleotides in messenger RNA makes a codon for an
amino acid [CBSE PMT 2004]
A)
One
B)
Two
C)
Three
D)
Four
question_answer5)
Chargaff's rule states that in an organism [CBSE PMT 2003]
A)
Amounts of all bases are equal
B)
41. Amount of adenine A is equal to that of thymine T and the amount of guanine
G is equal to that of cytosine C
C)
Amount of adenine A is equal to that of guanine G and the amount of thymine
T is equal to that of cytosine C
D)
Amount of adenine A is equal to that of cytosine C and the amount of thymine
T is equal to guanine G
question_answer6)
DNA multiplication is called [Kerala (Med.) 2000]
A)
Translation
B)
Transduction
C)
Transcription
D)
Replication
question_answer7)
Insulin is a protein which plays the role of [KCET 1986]
A)
An antibody
B)
A harmone
C)
An enzyme
D)
A transport agent
question_answer8)
Proteins fulfil several functions in living systems. An example of a protein which
acts as a hormone is [KCET 1985]
A)
Casein
B)
Oxytocin
C)
42. Trypsin
D)
Keratin
question_answer9)
Pick out the unsaturated fatty acid from the following [KCET 2004; MHCET 2002]
A)
Stearic acid
B)
Lauric acid
C)
Oleic acid
D)
Palmitic acid
question_answer10)
Vitamin B12 contains metal [Bihar MEE 1997; RPET 1999; Pb. PMT 1999; AFMC
2002; CBSE PMT 2003; CPMT 2003; MP PMT 2003]
A)
Ca (II)
B)
Zn (II)
C)
Fe (II)
D)
Co (III)
question_answer11)
The number of molecules of ATP produced in the lipid metabolism of a molecule of
palmitic acid is [CBSE PMT 1998]
A)
130
B)
36
C)
56
D)
86
43. question_answer12)
Protein can be most easily removed from [UPSEAT 2000, 02]
A)
Alkanes
B)
Alkenes
C)
Alkynes
D)
Benzene
question_answer13)
The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called
[CBSE PMT 2004]
A)
Zymase
B)
Pepsin
C)
Maltase
D)
Lipase
question_answer14)
The helical structure of protein is stabilized by [CBSE PMT 2004]
A)
Ether bonds
B)
Peptide bonds
C)
Dipeptide bonds
D)
Hydrogen bonds
question_answer15)
The cell membranes are mainly composed of [CBSE PMT 2005]
44. A)
Carbohydrates
B)
Proteins
C)
Phospholipids
D)
Fats
question_answer16)
A compound of mol. wt. 180 is acetylated to give a compound of mol. wt. 390. The
number of amino groups in the initial compound is [KCET 1996]
A)
2
B)
4
C)
5
D)
6
question_answer17)
Starting with three different amino acid molecules, how many different tripeptide
molecules are formed [Kerala PMT 1999; KCET 1999]
A)
12
B)
9
C)
8
D)
6
question_answer18)
Which one of the following is a polysaccharide [NDA 1999]
A)
Nylon
B)
Amylose
45. C)
Ribose
D)
Polyethylene
question_answer19)
Which of the following is not an acidic amino acid
A)
Lysine
B)
Arginine
C)
Aspartic acid
D)
Histidine
question_answer20)
Proteins do not respond to
A)
Biuret test
B)
Heller's ring test
C)
Ninhydrin test
D)
Lucas test
question_answer21)
Alkyl benzene sulphonates can be conductivity used as detergents in hard water,
unlike soaps, as [AMU 2002]
A)
They are highly soluble in water
B)
Their Ca++/Mg++ salts are water soluble
C)
They are non-ionic
D)
Their Ca++/Mg++ salts are insoluble in water
46. question_answer22)
When glucose reacts with bromine water, the main product is [Pb. CET 2003; BHU
2004]
A)
Acetic acid
B)
Saccharic acid
C)
Glyceraldyhyde
D)
Gluconic acid
question_answer23)
A zwitter ion is [KCET 1989]
A)
A positively charged ion without a metal atom in it
B)
A negatively charged ion without metal atom in it
C)
An ion with positive and negative charges at different points on it
D)
A heavy ion with a small charge on it
question_answer24)
Ribose is an example of [KCET 1998]
A)
Ketohexose
B)
Aldopentose
C)
Disaccharide
D)
Aldohexose
question_answer25)
The two forms of D-glucopyranose obtained from the solution of D-glucose are
called [IIT JEE Screening 2005]
