MCAT Biochemistry Questions | Practice Test / Quiz / MCQs

Home > Fashion Business > Quizzes > MCAT Biochemistry Questions

MCAT Biochemistry Questions

Fast practice, instant feedback. Timer auto-submits when time’s up.

Avg score: 25% • Most missed: “What is the Watson-Crick model of DNA structure?”

Biochemistry Subjects To Study For The MCAT are:
Amino Acids, Peptides and Proteins
Biological Membranes
Carbohydrate metabolism
Carbohydrate structure
DNA and RNA
Enzymes
Lipids and lipid metabolism
Nonenzymatic proteins
Regulation of metabolism

MCAT Biochemistry Questions

Time left 00:00

25 Questions

1. What are the main components of the ETC?

When an inhibitor can bind to the enzyme or the enzyme substrate complex, but with different affinity. One must know the relative affinities of the inhibitor to know how the Km will be affected. However, the Vmax is always lowered in mixed inhibition.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.

2. What are Elongation Factors?

1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.When an inhibitor can bind to the enzyme or the enzyme substrate complex, but with different affinity. One must know the relative affinities of the inhibitor to know how the Km will be affected. However, the Vmax is always lowered in mixed inhibition.

3. What is the leading strand?

When an inhibitor can bind to the enzyme or the enzyme substrate complex, but with different affinity. One must know the relative affinities of the inhibitor to know how the Km will be affected. However, the Vmax is always lowered in mixed inhibition.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

4. What is mixed inhibition?

Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)When an inhibitor can bind to the enzyme or the enzyme substrate complex, but with different affinity. One must know the relative affinities of the inhibitor to know how the Km will be affected. However, the Vmax is always lowered in mixed inhibition.

5. What are the three possible fates for Pyruvate?

The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.1. Conversion into acetyl-coa by Pyruvate Dehydrogenase (PDH) 2. Conversion into lactate by lactate dehydrogenase 3. Conversion to oxaloacetate by pyruvate carboxylase.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

6. What is a daughter strand?

The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The newly synthesized DNA strand.

7. What is saturation?

Saturation is the point at which every enzyme has a substrate bound. Adding substrate at this point will not increase the speed of the reaction.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

8. What is an enzyme?

The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.A biological catalyst.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

9. What are counterregulatory hormones?

1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The counterregulatory hormones are a group of hormones that have the opposite effect of insulin on muscle, liver, and adipose tissue. These hormones are Glucagon, Epinephrine, cortisol, and growth hormone.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.

10. What is glycogenin?

1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)Glycogenin is a core protein that glycogen uses as its core and starting synthesis point.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.

11. Describe Acetyl-CoA Carboxylase

1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)Acetyl-CoA Carboxylase uses biotin, ATP, and CO2 to form malonyl-CoA from Acetyl-CoA. This is one of the first steps of fatty acid synthesis. This enzyme is activated by insulin and citrate.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.

12. What are the three main control points of the citric acid cycle?

1. Citrate Synthase (step 1) 2. Isocitrate Dehydrogenase (step 3) 3. A-Ketoglutarate Dehydrogenase Complex (step 4)Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.

13. What is the 5th step of Glycolysis?

1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Glyceraldehyde 3-P is the only molecule that can continue down the glycolytic pathway, and so the DHAP molecule from the cleavage of Fructose 1,6 -bis P is converted into Glyceraldehyde 3-P by an Isomerase for a total of two Glyceraldehyde 3-P's

14. Describe the first step of the Citric Acid Cycle

Acetyl-CoA and Oxaloacetate undergo a condensation reaction with the help of Citrate Synthase to form Citrate and a free CoA.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

15. What is a Line-Weaver Burke Plot?

Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.A Line-Weaver Burke Plot is a modified Michaelis-Menten equation. It measures 1/v and 1/s instead of v and s. For this reason, Line-Weaver Burke Plots are often called double reciprocal graphs. These plots are used because they represent the equation behind enzyme kinetics in the form of a straight line.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.

16. What is the role of structural proteins?

1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.Structural proteins help the body maintain structure by making up the cytoskeleton of cells, the extracellular matrix, and connective tissue like tendons and ligaments.

17. What is Vitamin A?

18. What is an irreversible enzyme?

Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.An enzyme that pushes a reaction forward so hard that it is essentially unreversable. These steps are important to note because, unlike the other steps of metabolism, they aren't in much of an equilibrium. At these steps, the reaction goes almost exclusively forward.

19. How does replication of DNA proceed differently in prokaryotes versus eukaryotes?

1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Eukaryotes will have multiple origins of replication and result in two attached sister chromatids. Prokaryotes will only have one origin of replication and result in two unattached chromosomes.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.

20. All chiral amino acids in eukaryotes are [L- or D- amino acids?]

21. What is an anomer?

22. What are transcription factors?

Transcription factors are proteins that bind to DNA and either help or hurt the transcription of certain genes. In the case of helping, transcription factors help RNA pol find and bind to the DNA of interest.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

23. Describe the metabolic changes associated with the Postabsorptive state.

In the postabsorptive state, glycogen is degraded in the liver and released into the blood to fuel other tissues. Gluconeogenesis in the liver also helps to make glucose for the body, albeit much more slowly and over time. The release of amino acids from proteins and fatty acids from adipose tissue are both stimulated by the decrease in insulin and the presence of counterregulatory hormones. Again, the point is to make glucose so these get shuttled to gluconeogenic pathways in the liver.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

24. Describe Mismatch Repair

Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.In the G2 phase of the cell cycle, special enzymes will check the DNA for errors and correct them.1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)

25. What are the 3 main types of lipids?

1. Structural Lipids 2. Signalling Lipids 3. Energy Storage Lipids1. Complex 1 (NADH-CoQ oxioreductase) 2. Complex 2 (Succinate-CoQ Oxioreductase) 3. Complex 3 (CoQH2 -cytochrome c Oxioreductase) 4. Complex 4 (Cytocrhome c Oxidase) 5. ATP Synthase (technically its own thing, but extremely closely linked to the ETC and often referred to as the 5th complex.)The daughter strand that is copied in a continous fashion because it is moving in the same direction as the replication fork.Proteins that speed up elongation by bringing in tRNAs and GTP. Elongation Factors also get rid of GDP (used up GTP) so that fresh GTP's can take their place.

⚡ Recently practiced quizzes in this topic

Live quiz activity

Fashion Design: Elements & Principles Of Design Fashion Marketing (India) Fashion & Interior Design Fashion Retail NOCTI Fashion Merchandising Review Fashion Industry Fashion Merchandizing Menswear Textile Final Exam

25 Questions

❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | What Should We Know?
Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com

All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.

25 Questions

❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | What Should We Know? Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson© 2026 Fatskills.com

All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | What Should We Know?
Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com