Question 1

Which structure is indicated by the arrows in the first image, and what is its primary function during mitosis?

Accepted Answer

Centromere; it holds sister chromatids together and is the attachment site for spindle fibers.

Question 2

Refer to the second image. Which phase of mitosis is depicted, and what key event occurs during this phase?

Accepted Answer

Metaphase; chromosomes align at the metaphase plate.

Question 3

The third image shows two cells connected by a structure. What process is being illustrated, and what is the structure called?

Accepted Answer

Cytokinesis; the structure is the cleavage furrow.

Question 4

In the fourth image, which molecule is responsible for activating cyclin-dependent kinases (Cdks) and what is the result of this activation?

Accepted Answer

Cyclin; activation of Cdks triggers progression through the cell cycle.

Question 5

The fifth image illustrates chromosome duplication and segregation. Which statement best describes what is happening at the DNA level during the middle stage?

Accepted Answer

Each chromosome has been duplicated, forming two sister chromatids held together at the centromere.

Question 6

Based on the sixth image, which phase of the cell cycle is the longest, and what major event occurs during this phase?

Accepted Answer

Interphase; the cell grows and DNA is replicated.

Question 7

The seventh image shows a cell with two yellow structures near the nucleus. What are these structures, and what is their role in cell division?

Accepted Answer

Centrosomes; they organize the microtubules of the mitotic spindle.

Question 8

In the eighth image, what is the significance of the microtubules attaching to the chromosomes, and what are these attachment sites called?

Accepted Answer

Microtubules attach to kinetochores, allowing chromosomes to be moved during mitosis.

Question 9

The ninth image shows chromosomes aligned in the center of the cell. What is this structure called, and why is it important?

Accepted Answer

Metaphase plate; it ensures chromosomes are evenly divided between daughter cells.

Question 10

In the tenth image, what is the main event occurring, and what would happen if this process failed?

Accepted Answer

Chromosomes are being separated to opposite poles (anaphase); failure would result in aneuploidy.

Question 11

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before proceeding, and what could result if this checkpoint is bypassed?

Accepted Answer

M checkpoint; bypassing it can lead to unequal chromosome distribution and aneuploidy.

Question 12

What is the role of cyclin in the cell cycle, as depicted in the fourth image, and why does its concentration fluctuate?

Accepted Answer

Cyclin binds to Cdks to activate them; its concentration fluctuates to regulate cell cycle transitions.

Question 13

If a cell fails to pass the G1 checkpoint, what is the most likely outcome for the cell?

Accepted Answer

The cell enters the G0 phase and stops dividing.

Question 14

Which of the following best describes the difference between chromatin and a chromosome?

Accepted Answer

Chromatin is the uncondensed form of DNA, while a chromosome is the condensed, organized structure visible during mitosis.

Question 15

A scientist observes a cell with chromosomes lined up at the metaphase plate but not yet separated. Which checkpoint must be passed before the cell can proceed, and what is being checked?

Accepted Answer

M checkpoint; it checks that all kinetochores are attached to spindle fibers.

Question 16

Which of the following equations correctly represents the number of chromosomes ($$n) $$and DNA molecules ($$d) in a $$human somatic cell during G2 phase?

Accepted Answer

$$n = 46$$, $$d = 92$$

Question 17

Which process is unique to plant cell cytokinesis and not found in animal cells?

Accepted Answer

Formation of a cell plate from vesicles derived from the Golgi apparatus.

Question 18

What is the primary function of nonkinetochore microtubules during mitosis?

Accepted Answer

They elongate the cell during anaphase by pushing against each other.

Question 19

A patient is treated with a drug that inhibits microtubule depolymerization. What stage of mitosis would be directly affected, and what would be the consequence?

Accepted Answer

Anaphase; chromosomes would fail to separate properly.

Study Guide for Chapter 12: The Cell Cycle (General Biology)

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