This document contains a biology midterm exam with multiple choice and short answer questions about various biology topics like photosynthesis, digestion, the Krebs cycle, limiting nutrients, caffeine toxicity, drug deaths, and pharmacological terms. The exam is assessing the student's understanding of key course concepts through questions that require recalling, explaining, and applying biological knowledge.

1. Bio-Assignment02: week two
Term: 2019 Summer
Assignment 2
Name: ___________________________ Time:
_______________Total: _________
1. True or False
(i) Viruses contain either RNA or DNA as a genetic material.
Answer:___________
(ii) Virus having an arthropod as vector or intermediate host is
called arbovirus.
Answer:___________
2. Select the correct pair.
Answer:___________
(a) Acidic amino acid - Arginine
(b) Basic amino acid - Phenylalanine
(c) Alcoholic amino acid - Threonine
(d) Neutral amino acid – Cysteine
3. Which of the following is an example of polysaccharides?
Answer:__________
(a) Sucrose (b) Maltose (c) Raffinose (d) Cellulose
4. Select the correct statement regarding nucleic acids.
Answer:__________
(a) These are long chain micromolecules formed by
polymerisation of nucleotides.
(b) The backbone of a DNA strand is built up of deoxyribose
and phosphoric acid groups.

2. (c) The two DNA chains are identical.
(d) RNA is Fuelgen positive.
5. The double stranded DNA has 15% of cytosine. The
percentage of adenine in DNA will be:
Answer:__________
(a) 35% (b) 30% (c) 45% (d) 70%.
6. A phosphoglyceride is always made up of :
Answer:__________
(a) a saturated or unsaturated fatty acid esterified to a
glycerol molecule to which a phosphate group is also attached
(b) a saturated or unsaturated fatty acid esterified to a
phosphate group which is also attached to a glycerol
molecule
(c) only a saturated fatty acid esterified to a glycerol
molecule to which a phosphate group is also attached
(d) only an unsaturated fatty acid esterified to a glycerol
molecule to which a phosphate group is also attached.
7. In India, we find mangoes with different flavours, colours,
fibre content, sugar content and even shelf-life. The large
variation is on account of: Answer:__________
(a) species diversity (b) induced mutations
(c) genetic diversity (d) hybridisation.
8. Select the correct chronological order of the evolution
of man.
Answer:__________
(a) Australopithecus → Homo erectus → Homo habilis→sapiens

3. (b) Australopithecus →Homo habilis→ Homo erectus
→sapiens
(c) sapiens → Australopithecus → Homo erectus → Homo
habilis
(d) sapiens → Australopithecus → Homo habilis → Homo
erectus
9. Essential Amino Acids.
10.Describe the mechanism of inheritance of ABO blood groups
in humans.
CHEM-Mid term test:
Term: 2019 Summer
Mid term test
Name: ___________________________ Time:
_______________Total: _________
1. Choose the right answer: (2points each, 6 points)
(1)Which of the substances below is not a compound?
A. Sugar
B. Water
C. Chlorine
D. Carbon dioxide
Answer:_________________
(2)In the periodic a group of family is described as:

4. A. Horizontal rows
B. Diagonal rows
C. Vertical columns
D. None of the above
Answer:_________________
(3)In what period does iodine belong to:
Answer:_________________
A. 5 B. 4 C. 3 D. 2
2. Write ground-state electron configurations for these ions,
which play important roles in biochemical processes in our
bodies: (2points each, 16 points)
(a) Na+ Answer:_________________
(b) Mg2+ Answer:_________________
(c) Cl - Answer:_________________
(d) K+ Answer:_________________
(e) Ca2+ Answer:_________________
(f) Fe2+ Answer:_________________
(g) Cu2 + Answer:_________________
(h) Zn2+ Answer:_________________
3.Classify these bonds as ionic, polar covalent, or co-valent:
(2points each, 8 points)
(a) the Si-Si bond inCl3SiSiCl3,
Answer:_________________

5. (b) the Si-Cl bond in Cl3SiSiCl3
Answer:_________________
(c) the Ca-F bond in CaF2
Answer:_________________
(d) the N-H bond in NH3
Answer:_________________
4. Complete and balance the following equations(3points each,
15 points)
(a) Sr + Se →
(b) Ca + H2 →
(c) Li + N2 →
(d) Al + S →
(e) HCOOH + CH3OH →
5. Name the following compounds: (3points each, 15 points)
H
3
C
C
H
CH
3
H
2
C
H
2
C

6. CH
3
(a)
H
3
C
H
2
C
H
C
H
2
C
CH
3
(b)
H
2
C
H
2
C
CH
3
(c)
H
3
C
C
H
C
2
H
5
C

7. H
C
H
CH
3
CH
3
CH
3
H
2
C
H
C
C
H
H
2
C
CH
3
(d)
Br
H
3
C
C
C
H
2
C
CH
3
(e)
Answer:_________________

8. Answer:_________________
Answer:_________________
Answer:_________________
Answer:_________________
6. Draw three resonance structures for the chlorate ion, ClO3- .
Show formal charges. (10 points)
7. Draw all possible isomers for the molecule C3H5Br. (10
points)
8. Suggest two chemical tests that would help you distinguish
between these two compounds: (10 points)
(a) CH3CH2CH2CH2CH3 (b) CH3CH2CH2CH=CH2
9. Diethyl ether (CH3CH2OCH2CH3)has a boiling point of 34.5
0C, and1-butanol (CH3CH2CH2CH2OH) has a boiling point
of 117 0C. (10 points)
� EMBED ChemDraw.Document.6.0 ���
H
3
C
C
H
CH
3
H
2
C
H
2
C
CH
3
(a)

9. H
3
C
H
2
C
H
C
H
2
C
CH
3
(b)
H
2
C
H
2
C
CH
3
(c)
H
3
C
C
H
C
2
H
5
C
H
C
H

10. CH
3
CH
3
CH
3
H
2
C
H
C
C
H
H
2
C
CH
3
(d)
Br
H
3
C
C
C
H
2
C
CH
3
(e)
_1620046520.cdx
CHEM-Assignment02: week two
Term: 2019 Summer

11. Assignment 2
Name: ___________________________ Time:
_______________Total: _________
1.Single Chioce:
(i) In the solution of the following groups , the ions in which
group will generate precipitation after adding HCl solution.
A. Hg22+, Pb2+ B. Be2+, Sn2+ C. Ag+,
Cu2+ D. Ba2+,Cd2+
Answer:________________________
(ii) The environment performs 10kJ work on the system, and the
system loses 5kJ of heat to the environment, the internal energy
of the system changes : ?。
(A) -15kJ (B) 5kJ (C) - 5kJ (D) 15kJ
Answer:________________________
(iii) The following substances can not release hydrogen in the
presence of water?
A. B2H6 B. CaH2 C. SiH4 D. N2H4
Answer:________________________
2. Characterize the following compounds as soluble or insoluble
in water: (a) Ca3(PO4)2, (b)Mn(OH)2, (c)AgClO3, (d)K2S,
(e)CaCO3, (f) ZnSO4,(g) Hg(NO3)2, (h) HgSO4, (i) NH4ClO4
Answer:
Soluble:
Insoluble:
3. On the basis of oxidation number considerations, one of
the following oxides would not react with molecular
oxygen: NO, N2O, SO2, SO3, P4O6. Which one is it? Why?.

12. 4. Acetic acid (CH3COOH) is an important ingredient of
vinegar. A sample of 50.0 m L of a commercial vinegar is
titrated against a 1.00 M NaOH solution. What is the
concentration (in M) of acetic acid present in the vinegar if
5.75 mL of the base were required for the titration?
5. Propane (C3H8) burns in oxygen to produce carbon dioxide
gas and water vapor. (a) Write a balanced equation for this
reaction. (b) Calculate the number
of liters of carbon dioxide measured at STP that could be
produced from 7.45 g of propane.
6. Water is an extremely weak electrolyte and therefore cannot
conduct electricity. Why are we often cautioned not to
operate electrical appliances when our hands are wet?
BIO-Mid term:
Term: 2019 Summer
Mid term test
Name: ___________________________ Time:
_______________Total: _________
1. Complete the following statement: (2.5points each, 20 points)
(1) The major chemical process in the light reactions of
photosynthesis involves the splitting of _____ and the release of
_____.
(2)In the dark reactions of photosynthesis, _____ from the
atmosphere is incorporated into organic molecules such as
_____.
(3) In a neuron that is not conducting an impulse, there is an
excess of _____ ions inside the cell and an excess of _____ ions
just outside the cell membrane.
(4) An action potential is caused by a large number of _____
ions moving across the cell membrane toward the _____.
2.Explain the differences between chemical digestion and

13. mechanical digestion.(10 points)
3.What kinds of food molecules can supply precursors to the
Krebs cycle. (10 points)
4.Which can lead to health problems: vitamin deficiencies or
vitamin megadoses? (10 points)
5. What is a limiting nutrient? What are some examples of
nutrients that can be limiting for the growth of plants? How can
farmers supply limiting nutrients to plants? (10 points)
6. Which of the following causes more cases of cancer:
heredity, smoking, or viruses? (10 points)
7.If the toxic dose of caffeine is about 16 g for a person
weighing 80 kg (about 180 pounds), how many cups of coffee,
consumed at one time, would it take to realize this dose? (10
points)
8.Of the many drugs described in chapter 14, which causes the
largest number of deaths from people under its influence? (10
points)
9.If a drug is described as an opiate agonist, what does that
mean? (10 points)