Name:______________________________Class: _________________ Date: _________________
Assessment
Biological Chemistry
Teacher Notes and Answers
SECTION: AMINO ACIDS AND PROTEINS
1. a
2. c
3. c
4. b
5. c
6. d
7. c
8. b
9. c
10. d
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
1
Quiz
Name:______________________________Class: _________________ Date: _________________
Assessment
Biological Chemistry
Section Quiz: Amino Acids and Proteins
In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question.
_____ 1. Which elements are contained in all protein molecules?
a. carbon, nitrogen, and oxygen
b. carbon, sulfur, and oxygen
c. carbon, nitrogen, and sulfur
d. carbon, nitrogen, and iron
_____ 2. The characteristic functional groups of a protein are
a. OH and NH2.
b. COOH and CH2
c. COOH and NH2.
d. COOH and SH.
_____ 3. The symbol R in the structural formula of an amino acid represents
a. a metal.
b. a side chain.
c. a monosaccharide.
d. a disaccharide.
_____ 4. Which of the following is a product of the reaction of two amino acids
to form a dipeptide?
a. ammonia
b. nitrogen
c. water
d. oxygen
_____ 5. The unique characteristic of the amino acid cysteine is
a. a high level of acidity.
b. its ability to form hydrogen bonds with other amino acids.
c. its ability to form a chemical bond with another cysteine.
d. a second amino group.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
2
Quiz
Name:______________________________Class: _________________ Date: _________________
Section Quiz, continued
_____ 6. On a protein molecule, side chains of amino acids affect
a. only the primary structure.
b. primary and secondary structures.
c. secondary and tertiary structures.
d. tertiary and quaternary structures.
_____ 7. The specific function of a protein is determined by its
a. weight.
b. size.
c. shape.
d. precipitate.
_____ 8. What is the active site of an enzyme?
a. the disulfide bridge
b. the section of the molecule that interacts with a substrate
c. the carboxylic acid group at the end of the protein chain
d. a group of amino acids in the middle of the protein chain
_____ 9. An enzyme increases the rate of a reaction through formation of an
enzyme-substrate complex, which
a. raises the initial energy of the reactants.
b. lowers the final energy of the products.
c. lowers the activation energy.
d. raises the activation energy.
_____ 10. An enzyme can be denatured by
a. heating.
b. interaction with a substrate.
c. a very low pH.
d. Both (a) and (c)
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
3
Quiz