AAMC MCAT Practice Exam 2 Questions and Answers | Latest Version | 2024/2025 | 100% Verified
7 views 0 purchase
Course
AAMC MCAT Practice
Institution
AAMC MCAT Practice
AAMC MCAT Practice Exam 2 Questions
and Answers | Latest Version | 2024/2025
| 100% Verified
Which of the following best describes the role of enzymes in biochemical reactions?
- A) Enzymes increase the activation energy required for reactions to occur
- B) Enzymes are consumed in the re...
AAMC MCAT Practice Exam 2 Questions
and Answers | Latest Version | 2024/2025
| 100% Verified
Which of the following best describes the role of enzymes in biochemical reactions?
- A) Enzymes increase the activation energy required for reactions to occur
- B) Enzymes are consumed in the reaction and not regenerated
✔✔ C) Enzymes lower the activation energy required for reactions to occur
- D) Enzymes change the equilibrium constant of a reaction
Rationale: Enzymes act as catalysts by lowering the activation energy required for a biochemical
reaction to proceed, which speeds up the reaction without being consumed or altering the
equilibrium constant.
In a solution, the pH is 4. What is the concentration of hydrogen ions in the solution?
- A) 10⁴ M
- B) 10⁵ M
1
,- C) 10⁻⁴ M
✔✔ D) 10⁻⁴ M
Rationale: The concentration of hydrogen ions in a solution is determined by the formula [H⁺] =
10⁻pH. For a pH of 4, [H⁺] = 10⁻⁴ M.
Which type of bond is primarily responsible for holding together the two strands of a DNA
molecule?
- A) Ionic bonds
✔✔ B) Hydrogen bonds
- C) Covalent bonds
- D) Van der Waals forces
Rationale: Hydrogen bonds are primarily responsible for holding together the complementary
base pairs in the two strands of a DNA molecule.
What is the main function of the ribosome in a cell?
2
,- A) Replication of DNA
✔✔ B) Protein synthesis
- C) ATP production
- D) Lipid synthesis
Rationale: The ribosome is responsible for protein synthesis by translating messenger RNA
(mRNA) into amino acid sequences.
Which of the following is a key difference between prokaryotic and eukaryotic cells?
- A) Prokaryotic cells have a nucleus; eukaryotic cells do not
✔✔ B) Eukaryotic cells have membrane-bound organelles; prokaryotic cells do not
- C) Prokaryotic cells have a cell wall; eukaryotic cells do not
- D) Eukaryotic cells are smaller than prokaryotic cells
Rationale: Eukaryotic cells have membrane-bound organelles, including a nucleus, whereas
prokaryotic cells lack these structures.
During cellular respiration, which molecule is the primary electron carrier?
3
, - A) ATP
✔✔ B) NADH
- C) FADH₂
- D) CO₂
Rationale: NADH is the primary electron carrier in cellular respiration, transferring electrons to
the electron transport chain for ATP production.
What is the primary role of the myelin sheath in neurons?
- A) To increase neurotransmitter release
✔✔ B) To insulate the axon and increase the speed of nerve impulse transmission
- C) To support cellular metabolism
- D) To facilitate synaptic transmission
Rationale: The myelin sheath insulates the axon of neurons and increases the speed of electrical
impulse transmission along the nerve cell.
4
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller SterlingScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.76. You're not tied to anything after your purchase.
