Biochemistry Practice Questions

1. Nonenzymatic glycosylation or glycation creates glycoproteins by:
A. Chemical addition of sugars to polypeptides
B. Extracellular synthesis
C. Attaching 20 amino acids
D. Secretion into extracellular matrix

2. Which of the following is a 5-carbon sugar?
A. Glucose
B. Fructose
C. Ribose
D. Sucrose

3. The optimum pH of pepsin is:
A. 5
B. 7.1
C. 8.1
D. 2

4. A catabolic enzyme:
A. Joins two or more substances into a larger molecule
B. Cleaves a molecule into two or more parts
C. Inserts a substance between two or more existing molecules
D. Acts as a chemical messenger between amino cells

5. An anabolic enzyme:
A. Cleaves a molecule into two or more parts
B. Inserts a substance between two or more existing molecules
C. Joins two or more substances into a larger molecule
D. Acts as a chemical messenger between amino cells

6. An allosteric enzyme has which of the following properties?
A. It can only operate in an acidic environment,
B. It can only operate in an alkaline environment,
C. It becomes active only when it binds with a specific cofactor,
D. It can function either as a catabolic or anabolic enzyme.

7. A proteolytic enzyme has the following action:
A. It cleaves complex sugars into simple sugars.
B. It joins fatty acids into proteins.
C. It joins proteins to sugars to form glycoproteins.
D. It cleaves protein molecules into smaller units.

8. Amylase has all of the following properties except:
A. It breaks down starches into sugars.
B. It cleaves proteins into amino acids.
C. It is a component of human saliva.
D. High serum levels may indicate pancreatic inflammation.

9. The function of a protein is determined primarily by:
A. Its molecular weight
B. The number of amino acids it contains
C. Its spatial conformation
D. Its affinity for hydrocarbons

10. Which of the following is not involved in the biosynthesis of a protein molecule?
A. Codon
B. Ribosome
C. Messenger RNA
D. Amylase

11. Amino acids in a protein are joined by:
A. Zwitterions
B. Hydrogen bonds
C. Peptide bonds
D. Van der Waals bonds

12. Protein catabolism can yield which of the following:
A. Complex carbohydrates
B. Glucose
C. Free fatty acids
D. Omega-3 fatty acids

13. The primary function of the Citric Acid Cycle is to:
A. Facilitate aerobic cellular energy production
B. Oxidize cellular toxins
C. Produce anaerobic energy by fermentation
D. Synthesize vitamin D

14. Which of the following is not produced by or an intermediate of the Citric Acid Cycle?
A. NADH
B. Citrate
C. Water
D. Glucose

15. What is ATP?
A. A cellular energy transfer medium
B. A source of biological electrons
C. A purine base and sugar bound to three phosphates
D. All of the above

16. ATP is synthesized from ADP by which process?
A. Dehydration synthesis
B. Oxidative phosphorylation
C. Protein catabolism
D. Beta oxidation

17. The reduced intermediaries produced by the TCA Cycle are used to:
A. Digest carbohydrates
B. Link amino acids into polypeptides
C. Supply electrons to phosphorylate ADP into ATP
D. Cleave polypeptides into amino acids

18. Which of the following is a free fatty acid?
A. Eicosapentaenoic acid
B. Citric acid
C. Cholesterol
D. Glycerol

19. Fatty acids are esterified into mono-, di-, or triglycerides by attaching to:
A. Sterol
B. Cholesterol
C. Glycerol
D. Sodium chloride

20. Omega-3 fatty acids have which of the following?
A. At least 3 double bonds
B. A 3-carbon backbone
C. A double bond 3 carbons from the end of the chain
D. At least 3 fatty acid molecules linked by omega bonds

Behavioral Science Practice Questions Answer Key

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Last Updated: 07/05/2018


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