Question 1

Which of the following best describes the function of cytoplasmic microtubules in a neuron?

Accepted Answer

They provide structural support and serve as tracks for vesicle transport along axons.

Question 2

What is the critical concentration ($C_c$) in microtubule polymerization?

Accepted Answer

The concentration of tubulin at which the rate of addition equals the rate of loss.

Question 3

During muscle contraction, which motor protein interacts with actin filaments?

Accepted Answer

Myosin

Question 4

Which statement about the 5' and 3' ends of DNA and RNA is correct?

Accepted Answer

The 5' end has a phosphate group, and the 3' end has a hydroxyl group.

Question 5

A cell is exposed to a non-competitive inhibitor of an enzyme. Which of the following best describes the effect on $V_{max}$ and $K_m$?

Accepted Answer

$V_{max}$ decreases, $K_m$ remains unchanged.

Question 6

Which process occurs in the nucleolus of a eukaryotic cell?

Accepted Answer

Ribosomal RNA (rRNA) synthesis and ribosome assembly

Question 7

Given the peptide sequence Ala-Gly-Ser, which bond is a peptide bond?

Accepted Answer

The bond between the carboxyl group of Ala and the amino group of Gly

Question 8

Which of the following is true about the function of the centrosome during cell division?

Accepted Answer

It organizes microtubules to form the mitotic spindle.

Question 9

Which enzyme is responsible for synthesizing the leading strand during DNA replication?

Accepted Answer

DNA polymerase III

Question 10

A mutation in the TATA box of a gene would most likely affect which process?

Accepted Answer

Initiation of transcription

Question 11

Which of the following best explains the difference between competitive and non-competitive enzyme inhibition?

Accepted Answer

Competitive inhibitors bind to the active site, while non-competitive inhibitors bind elsewhere on the enzyme.

Question 12

Which of the following is a function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Synthesis of membrane-bound and secretory proteins

Question 13

During the G1 phase of the cell cycle, which of the following occurs?

Accepted Answer

Cell growth and preparation for DNA synthesis

Question 14

Which of the following best describes the role of kinesin in intracellular transport?

Accepted Answer

It moves cargo toward the plus end of microtubules, typically away from the centrosome.

Question 15

Which of the following is a post-transcriptional modification in eukaryotic mRNA processing?

Accepted Answer

Addition of a 5' cap

Question 16

Which of the following bonds is found in carbohydrates and is responsible for branching in glycogen?

Accepted Answer

$\alpha$-1,6 glycosidic bond

Question 17

A cell is treated with a drug that depolymerizes microtubules. Which cellular process would be most directly affected?

Accepted Answer

Chromosome segregation during mitosis

Question 18

Which of the following is true regarding the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 19

Which of the following best describes the role of the GTP cap in microtubule dynamics?

Accepted Answer

It stabilizes the growing end of the microtubule and prevents depolymerization.

Question 20

Which of the following is a function of the mitochondria in eukaryotic cells?

Accepted Answer

Production of ATP through oxidative phosphorylation

Cell Biology Final Exam Study Guide: Cytoskeleton, Cell Division, and Molecular Biology

Study Guide - Practice Questions