Please help! Not sure about these questions..thanks QUESTION 1 An example of an endergonic reaction is A. Polymerizing a protein from amino acids. B. Breaking a protein down into amino acids. C. Breaking down ATP into ADP and P. D. Breaking down glucose (using oxygen) to make CO2 and H2O. QUESTION 2 When ATP breaks down to supply energy for cellular reactions, it often transfers its 3rd phosphate to another molecule. This is called ______, and makes the other molecule _______ reactive. A. catalysis . . . more B. phosphorylation . . . more C. phosphorylation . . . less D. polymerization . . . less QUESTION 3 Which is true of enzymes? A. They are highly specific in the reactions they catalyze. B. Chemically, most are carbohydrates. C. They accelerate reactions by adding energy. D. They break down and are used up as they catalyze reactions. QUESTION 4 What is peristalsis? A. Rings of muscle that can contract to close off the stomach at each end. B. A gland that secretes saliva. C. Coordinated muscle contractions that move the contents of the GI tract. D. A stomach enzyme that breaks down proteins. QUESTION 5 Which is not a component of gastric juice? A. H2O B. acid C. pepsin D. amylase QUESTION 6 What does the enzyme pepsin do? A. Completely breaks down proteins into individual amino acids. B. Completely breaks down carbohydrates into monosaccharides. C. Partially breaks down proteins into smaller polypeptides. D. Partially breaks down fats into fatty acids. A. Polymerizing a protein from amino acids. B. Breaking a protein down into amino acids. C. Breaking down ATP into ADP and P. D. Breaking down glucose (using oxygen) to make CO2 and H2O. Solution Ans. 1. B. Polymerizing a protein from amino acids. A reaction that requires (consume) energy (here, ATP in cells) to proceed is called endergonic reaction. Polymerization of amino acids into protein requires ATP expenditure. During elongation (in translation), the formation of each peptide bond requires energy equivalent to 4 ATP. So, it’s an endergonic reaction. Option A, C and D are exergonic reaction because they release ATP. Ans. 2.B. Phosphorylation, more Transfer of a phosphate group to a substrate is called phosphorylation and it makes the molecule more reactive. Ans. 3. A. Enzymes (enzymes are biocatalyst- most of them are protein, a few are RNA) are highly specific in the reaction they catalyze. Option B incorrect as enzyme are chemically proteins, not carbohydrates. Option C incorrect as they don’t add energy to a reaction. Option D incorrect as, being catalyst, they’re not consumed up during reaction. Ans. 4. C. The coordinated movement of GIT muscles to move intestinal content forwards trough the tract is called peristalsis. It is NOT a ring of muscles, or gland or an enzyme, it’s JUST the pattern of GIT contraction. Ans. 5. D. Amylase is produced by saliva or pancreas; but NOT by gastric glands. Ans. 6. C. Pepsin hydrolyze protein into smaller peptides at specific peptide bond. It does.

1. Please help! Not sure about these questions..thanks
QUESTION 1
An example of an endergonic reaction is
A.
Polymerizing a protein from amino acids.
B.
Breaking a protein down into amino acids.
C.
Breaking down ATP into ADP and P.
D.
Breaking down glucose (using oxygen) to make CO2 and H2O.
QUESTION 2
When ATP breaks down to supply energy for cellular reactions, it often transfers its 3rd
phosphate to another molecule. This is called ______, and makes the other molecule _______
reactive.
A.
catalysis . . . more
B.
phosphorylation . . . more
C.
phosphorylation . . . less
D.
polymerization . . . less
QUESTION 3
Which is true of enzymes?
A.
They are highly specific in the reactions they catalyze.
B.
Chemically, most are carbohydrates.
C.
They accelerate reactions by adding energy.
D.
They break down and are used up as they catalyze reactions.
QUESTION 4
What is peristalsis?

2. A.
Rings of muscle that can contract to close off the stomach at each end.
B.
A gland that secretes saliva.
C.
Coordinated muscle contractions that move the contents of the GI tract.
D.
A stomach enzyme that breaks down proteins.
QUESTION 5
Which is not a component of gastric juice?
A.
H2O
B.
acid
C.
pepsin
D.
amylase
QUESTION 6
What does the enzyme pepsin do?
A.
Completely breaks down proteins into individual amino acids.
B.
Completely breaks down carbohydrates into monosaccharides.
C.
Partially breaks down proteins into smaller polypeptides.
D.
Partially breaks down fats into fatty acids.
A.
Polymerizing a protein from amino acids.
B.
Breaking a protein down into amino acids.
C.
Breaking down ATP into ADP and P.
D.
Breaking down glucose (using oxygen) to make CO2 and H2O.

3. Solution
Ans. 1. B. Polymerizing a protein from amino acids.
A reaction that requires (consume) energy (here, ATP in cells) to proceed is called endergonic
reaction. Polymerization of amino acids into protein requires ATP expenditure. During
elongation (in translation), the formation of each peptide bond requires energy equivalent to 4
ATP. So, it’s an endergonic reaction.
Option A, C and D are exergonic reaction because they release ATP.
Ans. 2.B. Phosphorylation, more
Transfer of a phosphate group to a substrate is called phosphorylation and it makes the molecule
more reactive.
Ans. 3. A.
Enzymes (enzymes are biocatalyst- most of them are protein, a few are RNA) are highly specific
in the reaction they catalyze.
Option B incorrect as enzyme are chemically proteins, not carbohydrates.
Option C incorrect as they don’t add energy to a reaction.
Option D incorrect as, being catalyst, they’re not consumed up during reaction.
Ans. 4. C.
The coordinated movement of GIT muscles to move intestinal content forwards trough the tract
is called peristalsis.
It is NOT a ring of muscles, or gland or an enzyme, it’s JUST the pattern of GIT contraction.
Ans. 5. D.
Amylase is produced by saliva or pancreas; but NOT by gastric glands.
Ans. 6. C. Pepsin hydrolyze protein into smaller peptides at specific peptide bond.
It does not hydrolyze proteins into amino acids.
It does NOT hydrolyze carbohydrates or lipid.