Question 1

Which of the following best describes the primary difference between mitosis and meiosis in terms of chromosome number in daughter cells?

Accepted Answer

Mitosis results in daughter cells with the same chromosome number as the parent cell, while meiosis results in daughter cells with half the chromosome number.

Question 2

During which phase of the cell cycle does DNA replication occur, and what is the significance of this process?

Accepted Answer

DNA replication occurs during the S phase, ensuring that each daughter cell receives a complete set of chromosomes.

Question 3

A researcher observes a cell with chromosomes aligned at the center of the cell, spindle fibers attached to kinetochores, and centrosomes at opposite poles. Which stage of mitosis is being observed?

Accepted Answer

Metaphase

Question 4

Which of the following events distinguishes anaphase from other stages of mitosis?

Accepted Answer

Sister chromatids are separated as cohesin proteins are cleaved, and they move toward opposite poles.

Question 5

In animal cells, cytokinesis is characterized by the formation of which structure, and what is its function?

Accepted Answer

Cleavage furrow; it pinches the cell membrane to divide the cytoplasm.

Question 6

A mutation causes a cell to bypass the G1 checkpoint even when resources are insufficient. What is the most likely consequence?

Accepted Answer

The cell may replicate damaged or incomplete DNA, leading to genomic instability.

Question 7

Which of the following best explains why cancer cells can form tumors that invade other tissues?

Accepted Answer

Cancer cells lose anchorage dependence and can divide without being attached to a substratum.

Question 8

A scientist is studying a plant cell undergoing cytokinesis. Which structure is observed, and how does it differ from animal cell cytokinesis?

Accepted Answer

Cell plate; it forms by vesicles fusing at the center of the cell to separate the cytoplasm.

Question 9

Which protein complex is responsible for triggering a cell’s passage past the G2 checkpoint into the M phase, and what is its composition?

Accepted Answer

MPF, composed of cyclin and cyclin-dependent kinase (Cdk)

Question 10

If a cell fails to attach its chromosomes to spindle fibers during prometaphase, which checkpoint will prevent the cell from proceeding, and why is this important?

Accepted Answer

M checkpoint; it ensures all chromosomes are properly attached to the spindle before anaphase.

Question 11

Which of the following scenarios best illustrates density-dependent inhibition in cell division?

Accepted Answer

A wound heals as cells divide until the gap is filled, then stop dividing.

Question 12

A cell is observed with two centrosomes at opposite poles, chromosomes attached to spindle fibers at the metaphase plate, and kinetochores facing opposite directions. What is the next event that will occur?

Accepted Answer

Cohesin proteins will be cleaved, and sister chromatids will separate.

Question 13

Which of the following best describes the role of growth factors in the regulation of the cell cycle?

Accepted Answer

Growth factors are external signals released by certain cells to stimulate other cells to divide.

Question 14

A patient is diagnosed with a benign tumor. Which characteristic distinguishes this tumor from a malignant one?

Accepted Answer

The tumor cells remain at the original site and do not invade other tissues.

Question 15

Which of the following is true regarding the G0 phase of the cell cycle?

Accepted Answer

Cells in G0 phase have exited the cell cycle and are not preparing to divide.

Question 16

In bacterial cell division by binary fission, what is the role of the origin of replication?

Accepted Answer

It is the specific location on the DNA where replication begins.

Question 17

A cell is exposed to a drug that prevents the depolymerization of spindle microtubules. Which stage of mitosis will be directly affected, and what is the likely outcome?

Accepted Answer

Anaphase; sister chromatids will not move to opposite poles.

Question 18

Which of the following best defines a genome?

Accepted Answer

All the DNA in a cell.

Question 19

Which of the following is a correct sequence of events during the mitotic phase?

Accepted Answer

Prophase → Prometaphase → Metaphase → Anaphase → Telophase

Question 20

A cell is unable to form kinetochores during mitosis. Which process will be directly impaired?

Accepted Answer

Attachment of spindle microtubules to chromosomes

Mitosis and the Cell Cycle: Study Guide for BIOL150

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