Simple proteins. Structure and function

QUESTIONS FOR TEST CONTROL MODULE 1

PRACTICAL LESSON 1

SIMPLE PROTEINS. STRUCTURE AND FUNCTION

Choose the one correct answer:

1. A peptide bond:

A. has a partial double-bond character.

B. is ionized at physiologic pH

C. is cleaved by agents that denature proteins, such as organic solvents and high concentrations of urea.

D. is stabile to heating to strong acid

E. occurs most commonly in the cis configuration

2. Which one of the following correctly pairs an amino acid with a valid chemical characteristic?

A. Glutamine	contains a hydroxyl group in its side chain
B. Serine	can form disulfide bonds
C. Cysteine	contains the smallest side chain
D. Isoleucine	Is nearly always found buried in the center of proteins
E. Glycine	Contains an amide group in its side chain

3. Which one of the following statements concerning glutamine is correct?

A. Contains three titrable groups.

B. Is classified as an acidic amino acid.

C. Contains as amide group.

D. Has “E” as its one-letter symbol.

E. Migrates to the cathode (negative electrode) during electrophoresis at pH 7,0.

4. Which one of the following statements concerning protomer is correct?

A. the compact globular functional unit

B. the thermodynamically less stable structure

C. the proteins consisting of one or two polypeptide chain

D. a single subunit in the multimer

E. a multimer protein consisting of few subunits

5. What is the highest level of organization in albumin?

A. primary structure

B. secondary structure

C. tertiary structure

D. quaternary structure

E. peptide bond

6. What is the highest level of organization in hemoglobin?

A. primary structure

B. secondary structure

C. tertiary structure

D. quaternary structure

E. peptide bond

7. What is the primary structure of protein?

A. the sequence of D-amino acids in the polypeptide chain

B. the sequence of L- amino acids in the polypeptide chain

C. the three- dimensional structure

D. the compact globular functional unit

E. the thermodynamically most stable structure

8. What is the secondary structure of protein?

A. the sequence of D-amino acids in the polypeptide chain

B. the sequence of L- amino acids in the polypeptide chain

C. the three- dimensional structure

D. the compact globular functional unit

E. the thermodynamically most stable structure

9. What is the domain?

A. the sequence of D-amino acids in the polypeptide chain

B. the sequence of L- amino acids in the polypeptide chain

C. the three- dimensional structure

D. the compact globular functional unit

E. the thermodynamically less stable structure

10. Which one of the following statements concerning oligomer protein is correct?

A. the compact globular functional unit

B. the thermodynamically less stable structure

C. the proteins consisting of one or two polypeptide chain

D. a single subunit in the multimer

E. a multimer protein consisting of few subunits