Question 1

Which of the following statements best describes the difference between prokaryotic and eukaryotic chromosomes?

Accepted Answer

Prokaryotic chromosomes are usually circular and not complexed with histones, while eukaryotic chromosomes are linear and complexed with histones.

Question 2

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

Accepted Answer

S phase

Question 3

A diploid human cell contains 46 chromosomes. After mitosis and cytokinesis, how many chromosomes will each daughter cell contain?

Accepted Answer

46 chromosomes

Question 4

Which structure is the attachment point for spindle microtubules during mitosis?

Accepted Answer

Centromere

Question 5

If a mutation causes the loss of telomere function in a eukaryotic cell, which of the following is the most likely consequence?

Accepted Answer

Chromosome ends will become unstable, leading to degradation and fusion with other chromosomes.

Question 6

Which of the following best describes the genetic consequences of mitosis?

Accepted Answer

Two cells are produced, each genetically identical to the parent cell and to each other.

Question 7

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

Accepted Answer

Prophase, Metaphase, Anaphase, Telophase

Question 8

A cell is observed with chromosomes aligned at the metaphase plate, spindle fibers attached to kinetochores, and the nuclear envelope disintegrated. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 9

Which formula correctly represents the number of possible chromosome combinations in gametes produced by an organism with $$n$$ pairs of chromosomes?

Accepted Answer

$$2^n$$

Question 10

Which of the following is NOT a function of histone proteins in eukaryotic chromosomes?

Accepted Answer

Serving as attachment points for spindle fibers

Question 11

A scientist observes a cell with two distinct nuclei forming and chromosomes decondensing. Which stage of mitosis is being observed?

Accepted Answer

Telophase

Question 12

Which of the following best explains why viruses are not classified as prokaryotic or eukaryotic?

Accepted Answer

Viruses lack cellular machinery and do not possess membrane-bound organelles.

Question 13

Which of the following statements about human chromosomes is correct?

Accepted Answer

Gene density is not correlated with chromosome size.

Question 14

During which stage of mitosis do sister chromatids separate and move toward opposite spindle poles?

Accepted Answer

Anaphase

Question 15

Which of the following is a direct result of the breakdown of the nuclear envelope during mitosis?

Accepted Answer

Spindle microtubules can attach to kinetochores on chromosomes.

Question 16

A cell with a mutation in the centromere region fails to segregate chromosomes properly during mitosis. What is the most likely explanation?

Accepted Answer

Spindle fibers cannot attach to chromosomes, preventing proper segregation.

Question 17

Which of the following best describes the role of the nucleosome in chromatin structure?

Accepted Answer

It is the basic structural unit of chromatin, consisting of DNA wrapped around histone proteins.

Question 18

If a eukaryotic cell fails the spindle assembly checkpoint during metaphase, what is the most likely outcome?

Accepted Answer

The cell will pause in metaphase until all chromosomes are properly attached to spindle fibers.

Question 19

Which of the following equations correctly represents the total number of chromosomes in a diploid human cell?

Accepted Answer

$$2n = 46$$

Question 20

A researcher uses spectral karyotyping (SKY) to analyze chromosomes. What is the primary advantage of this technique?

Accepted Answer

It enables identification and differentiation of individual chromosomes using fluorescent labeling.

Chromosomes and Cellular Reproduction: Structure, Function, and Cell Division

Guida di studio - Domande di pratica

Study guide - Flashcard