Q: Which of the following equations correctly represents the relationship between the number of chromosomes ($$n) $$and the number of chromatids after DNA replication but before mitosis?

$$\text{Number of chromatids} = 2n$$

Question 1

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

Accepted Answer

To enable growth, repair, and asexual reproduction by producing genetically identical cells

Question 2

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

Accepted Answer

S phase; it ensures that each daughter cell receives an identical set of chromosomes

Question 3

A scientist observes a cell with condensed chromosomes aligned at the center of the cell. Which mitotic stage is this, and what is the main event occurring?

Accepted Answer

Metaphase; chromosomes align at the metaphase plate

Question 4

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

Accepted Answer

Kinetochore

Question 5

In the context of binary fission in prokaryotes, which of the following is TRUE?

Accepted Answer

Binary fission results in two genetically identical daughter cells

Question 6

A mutation prevents the formation of the cleavage furrow during cytokinesis in animal cells. What is the most likely outcome?

Accepted Answer

The cell will form two nuclei but remain as one large cell with two nuclei

Question 7

Which of the following equations correctly represents the relationship between the number of chromosomes ($$n) $$and the number of chromatids after DNA replication but before mitosis?

Accepted Answer

$$	ext{Number of chromatids} = 2n$$

Question 8

Which event distinguishes prometaphase from prophase during mitosis?

Accepted Answer

Spindle fibers attach to kinetochores and the nuclear envelope breaks down

Question 9

A plant cell is observed forming a cell plate during cytokinesis. What is the function of the cell plate?

Accepted Answer

To initiate the formation of a new cell wall between daughter cells

Question 10

If a human somatic cell (2n = 46) completes mitosis, how many chromosomes will each daughter cell have?

Accepted Answer

46

Question 11

Which of the following best explains why chromatin condenses into chromosomes before mitosis?

Accepted Answer

To prevent DNA from being damaged or entangled during segregation

Question 12

During which stage of mitosis do non-kinetochore microtubules lengthen, stretching the cell?

Accepted Answer

Anaphase

Question 13

A cell is observed with two nuclei forming at opposite poles and chromosomes beginning to uncoil. Which stage is this?

Accepted Answer

Telophase

Question 14

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

Accepted Answer

Animal cells form a cleavage furrow, while plant cells form a cell plate during cytokinesis

Question 15

If a mutation causes spindle fibers to fail to attach to kinetochores, what is the most likely result during mitosis?

Accepted Answer

Sister chromatids will not separate properly

Question 16

Which of the following best describes the role of the centromere during mitosis?

Accepted Answer

It is the site where spindle fibers attach to separate sister chromatids

Question 17

A researcher treats cells with a drug that prevents the breakdown of the nuclear envelope. Which stage of mitosis will be directly affected?

Accepted Answer

Prometaphase

Question 18

Which of the following is the correct sequence of mitotic stages?

Accepted Answer

Prophase → Prometaphase → Metaphase → Anaphase → Telophase

Question 19

Which of the following best explains why chromosome number is species-specific and remains constant in somatic cells?

Accepted Answer

Mitosis ensures equal distribution of chromosomes to daughter cells

Question 20

A patient’s tissue sample shows cells stuck in metaphase. Which drug mechanism could explain this observation?

Accepted Answer

A drug that prevents spindle fiber formation

Cell Cycle, Chromosomes, and Mitosis: Structured Study Notes

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