Question 1

Which of the following best describes the main purpose of mitosis in multicellular organisms?

Accepted Answer

To produce two genetically identical daughter cells for growth and repair

Question 2

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 3

What is the role of the mitotic spindle during mitosis?

Accepted Answer

It controls chromosome movement by attaching to kinetochores

Question 4

Which structure is responsible for organizing microtubules during mitosis in animal cells?

Accepted Answer

Centrosome

Question 5

What event marks the transition from metaphase to anaphase during mitosis?

Accepted Answer

Cohesins are cleaved, allowing sister chromatids to separate

Question 6

In animal cells, cytokinesis is accomplished by which of the following mechanisms?

Accepted Answer

Cleavage furrow produced by a contractile ring of microfilaments

Question 7

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

Accepted Answer

They do not require growth factors to divide and may have abnormal cell cycle control systems

Question 8

A researcher observes a cell with chromosomes aligned at the metaphase plate. Which phase of mitosis is this cell in?

Accepted Answer

Metaphase

Question 9

Which of the following is a key difference between cytokinesis in plant and animal cells?

Accepted Answer

Animal cells form a cleavage furrow, plant cells form a cell plate

Question 10

Which of the following best describes the 'Pac-man' mechanism during anaphase?

Accepted Answer

Motor proteins walk chromosomes along microtubules, which then depolymerize at the kinetochore ends

Question 11

Which equation best represents the number of chromosomes in daughter cells after mitosis, if the parent cell has $$2n$$ chromosomes?

Accepted Answer

$$2n$$

Question 12

In which phase of mitosis does the nuclear envelope begin to fragment, allowing spindle microtubules to interact with chromosomes?

Accepted Answer

Prometaphase

Question 13

Which of the following is true about binary fission in bacteria?

Accepted Answer

It results in two genetically identical daughter cells

Question 14

A scientist treats a plant cell with a drug that prevents vesicle fusion. What is the most likely effect on cytokinesis?

Accepted Answer

The cell will fail to form a cell plate, preventing proper cytokinesis

Question 15

Which of the following scenarios best illustrates metastasis?

Accepted Answer

Cancer cells spread to other parts of the body and form new tumors

Question 16

If a mutation prevents the production of separase, what would be the most direct effect during mitosis?

Accepted Answer

Sister chromatids would fail to separate during anaphase

Question 17

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

Accepted Answer

They attach chromosomes to spindle microtubules

Question 18

A cell is observed with two groups of chromosomes at opposite ends of an elongated cell, and the nuclear envelope is reforming. Which phase is this?

Accepted Answer

Telophase

Question 19

Which of the following treatments is most appropriate for a localized tumor that has not undergone metastasis?

Accepted Answer

High-energy radiation to damage DNA in cancer cells

Question 20

Which of the following best explains why personalized cancer treatments are becoming more common?

Accepted Answer

Advances in DNA sequencing allow treatments to target specific mutations in a patient's tumor

Mitotic Division and Regulation of the Eukaryotic Cell Cycle

Study Guide - Practice Questions