Question 1

Which of the following best describes the structural organization of eukaryotic chromatin as depicted in the first image?

Accepted Answer

Chromatin is organized into nucleosomes, which further coil into secondary and tertiary structures.

Question 2

Based on the second image, which statement about plasmids in bacterial cells is correct?

Accepted Answer

Plasmids are independent genetic elements separate from the bacterial chromosome.

Question 3

Referencing the third image, what is the diploid chromosome number for horses?

Accepted Answer

64

Question 4

Which phase of the cell cycle is characterized by the condensation of chromatin into visible chromosomes?

Accepted Answer

Prophase

Question 5

During which stage of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 6

If a human somatic cell undergoes mitosis, how many chromosomes will each daughter cell contain?

Accepted Answer

46

Question 7

Which checkpoint in the cell cycle is considered the 'restriction point' in mammalian cells?

Accepted Answer

G1 checkpoint

Question 8

What is the role of cyclin-dependent kinases (Cdks) in cell cycle regulation?

Accepted Answer

They activate cell cycle events by phosphorylating target proteins.

Question 9

Which of the following best explains why cancer cells can divide indefinitely?

Accepted Answer

They have escaped normal cell cycle controls and do not stop at checkpoints.

Question 10

A cell is observed to have a cleavage furrow forming. What type of cell is this most likely, and what process is occurring?

Accepted Answer

Animal cell undergoing cytokinesis

Question 11

Which equation correctly represents the number of chromosomes in a gamete relative to a somatic cell in humans?

Accepted Answer

$$n = N/2$$

Question 12

If a cell fails to pass the G1 checkpoint, what is its likely fate?

Accepted Answer

It will enter the G0 phase and stop dividing.

Question 13

Which of the following is a real-world example of density-dependent inhibition?

Accepted Answer

Normal skin cells stopping division when a wound is healed.

Question 14

Which process is unique to prokaryotic cell division and not found in eukaryotic mitosis?

Accepted Answer

Binary fission involving a single origin of replication

Question 15

A scientist observes a cell with chromosomes aligned at the metaphase plate. Which equation best describes the force balance at this stage?

Accepted Answer

$$F_{left} = F_{right}$$

Question 16

Which of the following treatments is most appropriate for a benign tumor?

Accepted Answer

Surgical removal

Question 17

Which of the following best describes the function of the kinetochore during mitosis?

Accepted Answer

It attaches chromosomes to spindle microtubules for segregation.

Question 18

A mutation causes a cell to ignore anchorage dependence. What is a likely outcome?

Accepted Answer

The cell may become cancerous and divide uncontrollably.

Question 19

Which equation represents the relationship between the number of chromosomes before and after DNA replication in the S phase?

Accepted Answer

$$C_{after} = C_{before}$$

Question 20

Which of the following is a plausible consequence of a defective M phase checkpoint?

Accepted Answer

Chromosomes may not be properly attached to the spindle, leading to aneuploidy.

The Cell Cycle: Mechanisms and Regulation

Study Guide - Practice Questions