Question 1

Which of the following best describes the difference between mitosis and meiosis in terms of genetic information passed to daughter cells?

Accepted Answer

Mitosis produces daughter cells with identical genetic information to the parent cell, while meiosis produces daughter cells with half the genetic information.

Question 2

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

Accepted Answer

S phase

Question 3

A scientist observes a cell with condensed chromosomes aligned at the center of the cell. Which phase of mitosis is this cell most likely in?

Accepted Answer

Metaphase

Question 4

What is the function of the mitotic spindle during cell division?

Accepted Answer

It controls chromosome movement by attaching to kinetochores and separating sister chromatids.

Question 5

Which checkpoint in the cell cycle is most critical for determining whether a cell will proceed to division?

Accepted Answer

G$$_1$$ checkpoint

Question 6

A mutation causes a cell to ignore density-dependent inhibition. What is a likely consequence of this mutation?

Accepted Answer

The cell will divide uncontrollably, potentially leading to tumor formation.

Question 7

Which of the following best explains why anti-cancer drugs like vinblastine are effective in treating cancer?

Accepted Answer

They inhibit microtubule polymerization, disrupting mitotic spindle formation and preventing cell division.

Question 8

If a cell fails to receive a go-ahead signal at the G$$_1$$ checkpoint, what is the most likely outcome?

Accepted Answer

The cell will exit the cell cycle and enter a non-dividing state called G$$_0.$$

Question 9

Which structure is responsible for attaching chromosomes to spindle microtubules during mitosis?

Accepted Answer

Kinetochore

Question 10

A plant cell is observed forming a cell plate during cytokinesis. What is the significance of this structure?

Accepted Answer

It initiates the formation of a new cell wall between daughter cells.

Question 11

Which of the following equations correctly represents the number of chromosomes in gametes compared to somatic cells?

Accepted Answer

$$n_{gamete} = \frac{1}{2} n_{somatic}$$

Question 12

Which molecular complex allows cells to pass the G$$_2$$ checkpoint and enter mitosis?

Accepted Answer

Maturation-promoting factor (MPF), a cyclin-Cdk complex

Question 13

A researcher treats cells with Taxol, which prevents microtubule depolymerization. What effect will this have on mitosis?

Accepted Answer

Sister chromatids will not separate properly during anaphase.

Question 14

Which of the following is NOT a function of cell division in multicellular organisms?

Accepted Answer

Protein synthesis

Question 15

What is the role of cyclin in the cell cycle?

Accepted Answer

Cyclin binds to Cdks to activate them, regulating progression through cell cycle checkpoints.

Question 16

Which of the following best describes the process of binary fission in bacteria?

Accepted Answer

The bacterial chromosome replicates and the cell divides into two genetically identical daughter cells.

Question 17

A cell is observed with a contractile ring of microfilaments forming a cleavage furrow. What type of cell is this most likely?

Accepted Answer

Animal cell undergoing cytokinesis

Question 18

Which of the following mechanisms helps regulate the cell cycle in normal mammalian cells but is often lost in cancer cells?

Accepted Answer

Anchorage dependence and density-dependent inhibition

Question 19

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

Accepted Answer

Anaphase

Question 20

A cell is observed with fragments of the nuclear envelope and chromosomes attached to spindle microtubules. Which phase is this cell most likely in?

Accepted Answer

Prometaphase

Cell Division and the Cell Cycle

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