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Quiz 2 and Test 2 Review - BHCM2024 Smr II 2025

Total questions: 50

Worksheet time: 57mins

Name
Class
Date
1.

Which of the following is NOT a function of proteins?

a)

Energy storage

b)

Enzyme catalysis

c)

Structural support

d)

Signal transduction

2.

Which amino acid is achiral?

a)

Alanine

b)

Glycine

c)

Leucine

d)

  Serine

3.

At physiological pH (~7.4), which group of amino acids is typically positively charged?
  

a)

Hydrophobic

b)

  Polar

c)

Acidic

d)

   Basic

4.

Which of the following amino acids can form disulfide bonds?

a)

Serine

b)

Cysteine

c)

Threonine

d)

Tyrosine

5.

The pKa of the carboxyl group of an amino acid is approximately:

a)

2

b)

5

c)

7

d)

9

6.

Which level of protein structure is defined by the sequence of amino acids?

a)

Primary 

b)

Secondary

c)

Tertiary

d)

   Quaternary

7.

Which of the following amino acids is a helix breaker?

a)

Alanine

b)

Leucine

c)

Proline

d)

Glutamate

8.

Which protein structure level involves interactions between multiple polypeptide chains?

a)

Primary 

b)

Secondary

c)

Tertiary

d)

Quaternary

9.

Which of the following is true about peptide bonds? 

a)

They are formed by hydrolysis

b)

They allow free rotation

c)

They are planar and rigid

d)

They are ionic in nature

10.

Which of the following is NOT a noncovalent interaction stabilizing tertiary structure? 

a)

Hydrogen bonds

b)

Ionic interactions

c)

Disulfide bonds

d)

Hydrophobic interactions

11.

Which protein structure is most affected by denaturation?

a)

Primary

b)

Secondary

c)

Tertiary

d)

Quaternary

12.

Which of the following is a post-translational modification?  

a)

Peptide bond formation

b)

Phosphorylation

c)

Translation

d)

Transcription

13.

Which of the following best describes a zwitterion?

a)

A molecule with no charge  

b)

A molecule with both positive and negative charges

c)

A molecule with only positive charge

d)

A molecule with only negative charge

14.

Which of the following is a method used to predict protein structure? 

a)

PCR

b)

  AlphaFold

c)

Western blot

d)

ELISA

15.

Which of the following amino acids is most likely to be found in the interior of a protein? 

a)

Serine

b)

Glutamine

c)

Valine

d)

Arginine

16.

Which of the following is true about metamorphic proteins? 

a)

They are always unfolded

b)

They have only one native state

c)

They can adopt multiple functional conformations

d)

They are always denatured

17.

Which of the following best describes the hydrophobic effect?

a)

Attraction between charged groups 

b)

Repulsion of water by nonpolar groups

c)

Formation of hydrogen bonds

d)

Disulfide bond formation

18.

All amino acids are chiral.

a)

True

b)

False

19.

The tertiary structure of a protein is stabilized only by covalent bonds

a)

True

b)

False

20.

Explain the defiinitions of and interplay between primary, secondary, tertiary, and quaternary structure in proteins.

4 lines
21.

The bond that links amino acids together in a protein is called a:

(a)  

22.

Explain in detail how two amino acids are bonded together. I'm looking for the type of reaction this is, what product is released, etc.

4 lines
23.

Explain all of the charges on the amino acid lysine at pH 7.

4 lines
24.

The (a)   value indicates the pH at which a functional group is 50% protonated

25.

How does pH influence the ionization state of amino acids?

4 lines
26.

An amino acid that has a neutral charge at pH 7 has a +1 charge at pH 5.

Explain:

  1. 1. What we know about the pKa of this amino acid

  2. 2. What would be the charge of this amino acid at pH 1.5?

  3. 3. What would be the charge of this amino acid at pH 11.5?

4 lines
27.

How do post-translational modifications affect protein function?

4 lines
28.

Describe what AlphaFold is and how it has transformed protein structure prediction

4 lines
29.

Which enzyme initiates protein digestion in the stomach?

a)

Trypsin

b)

Pepsin

c)

Chymotrypsin

d)

Amylase

30.

What type of amino acids must be obtained from the diet?

a)

Nonessential

b)

Essential

c)

Conditional

d)

Aromatic

31.

Which organ is primarily responsible for amino acid metabolism?

a)

Kidney

b)

Brain

c)

Liver

d)

Pancreas

32.

Which molecule transports amino acids to the liver?

a)

Hemoglobin

b)

Albumin

c)

Myosin

d)

Insulin

33.

Which vitamin is a precursor for NAD+?

a)

B1

b)

B2

c)

B3

d)

B5

34.

Which enzyme catalyzes the committed step of the urea cycle?

a)

CPSI

b)

ALT

c)

AST

d)

NAG synthase

35.

Which of the following is NOT a function of bile salts?

a)

Emulsify fats

b)

Kill bacteria

c)

Hydrolyze proteins

d)

Denature proteins

36.

Which coenzyme is derived from vitamin B2?

a)

NAD+

b)

FAD

c)

Coenzyme A

d)

Biotin

37.

Which enzyme is used as a diagnostic marker for liver damage?

a)

CPSI

b)

Alanine aminotransferase

c)

Pepsin

d)

Chymotrypsin

38.

Which of the following is true about holoenzymes?

a)

They are inactive

b)

They lack cofactors

c)

They are active

d)

They are vitamins

39.

Explain the relationship between cofactors, apoenzymes, and holoenzymes.

4 lines
40.

Which molecule is excreted in urine as a result of amino acid metabolism?

a)

Ammonia

b)

Urea

c)

Glucose

d)

Ketone

41.

Which of the following is NOT a feature of enzyme active sites?

a)

Large volume

b)

Excludes water

c)

3D crevice

d)

Noncovalent interactions

42.

Which of the following is a coenzyme?

a)

Mg2+

b)

Zn2+

c)

NAD+

d)

Fe2+

43.

Which of the following is a function of chymotrypsin?

a)

Cleaves nucleic acids

b)

Cleaves oligopeptides

c)

Transports amino acids

d)

Synthesizes urea

44.

(a)   is the most abundant protein in the blood.

45.

Bile salts are synthesized from (a)  

46.

Explain what the induced conformational model is

4 lines
47.

How do enzymes lower activation energy?

4 lines
48.

Explain the difference between competitive, uncompetitive, and noncompetitive inhibitors

4 lines
49.

Describe the metabolic fate of keto acids derived from amino acids

4 lines
50.

All enzymes require cofactors

a)

True

b)

False

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