Question 1

During which phase of mitosis do chromosomes line up at the center of the cell, and what is the significance of this arrangement?

Accepted Answer

Metaphase; it ensures that each daughter cell receives an identical set of chromosomes.

Question 2

Which structure forms in plant cells during cytokinesis, and what is its function?

Accepted Answer

Cell plate; it develops into a new cell wall between the two daughter cells.

Question 3

If a cell has 8 chromosomes at the start of interphase, how many chromosomes will each daughter cell have after mitosis?

Accepted Answer

$$8$$

Question 4

Which phase of mitosis is characterized by the disappearance of the nuclear envelope and the formation of spindle fibers?

Accepted Answer

Prophase

Question 5

A researcher observes a cell with chromosomes being pulled toward opposite poles. Which phase is the cell in?

Accepted Answer

Anaphase

Question 6

What is the main difference between cytokinesis in animal cells and plant cells?

Accepted Answer

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

Question 7

During which stage of the cell cycle does DNA replication occur, and what is the result?

Accepted Answer

S phase; each chromosome consists of two sister chromatids.

Question 8

Why is metaphase considered the shortest phase of mitosis?

Accepted Answer

Because chromosomes quickly align at the metaphase plate.

Question 9

Which of the following best describes the events of telophase in animal cells?

Accepted Answer

DNA uncoils, two nuclei form, and the cell membrane pinches in to create two daughter cells.

Question 10

A mutation prevents spindle fibers from attaching to centromeres. Which phase of mitosis would be directly affected?

Accepted Answer

Metaphase

Question 11

If a plant cell fails to form a cell plate during cytokinesis, what is the most likely outcome?

Accepted Answer

The cell will have two nuclei but remain as one large cell.

Question 12

Which of the following equations correctly represents the relationship between the number of chromosomes before and after mitosis in a diploid cell?

Accepted Answer

$$N_{daughter} = N_{parent}$$

Question 13

Which phase of mitosis is the longest, and what major event occurs during this phase?

Accepted Answer

Prophase; chromosomes appear and spindle fibers form.

Question 14

A scientist observes a cell with uncoiled DNA and two distinct nuclei. Which phase is the cell most likely in?

Accepted Answer

Telophase

Question 15

Which of the following is NOT a function of interphase?

Accepted Answer

Chromosome separation

Question 16

In which phase do spindle fibers begin to form and centrioles separate in animal cells?

Accepted Answer

Prophase

Question 17

What would happen if the nuclear envelope did not disappear during prophase?

Accepted Answer

Spindle fibers could not attach to chromosomes, preventing proper chromosome segregation.

Question 18

Which of the following best describes the role of spindle fibers during mitosis?

Accepted Answer

They attach to centromeres and pull chromatids apart during anaphase.

Question 19

A cell is observed with chromosomes aligned at the metaphase plate but not separating. Which checkpoint might be malfunctioning?

Accepted Answer

Spindle assembly checkpoint (M checkpoint)

Question 20

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

Accepted Answer

Animal cells pinch in to form daughter cells, while plant cells build a new cell wall between nuclei.

16-Mitosis: Stages and Cellular Processes in Animal and Plant Cells

Guida di studio - Domande di pratica