Question 1

Which of the following best describes the process by which DNA is packaged into a chromosome, as shown in the image provided?

Accepted Answer

DNA is wrapped around histone proteins to form nucleosomes, which are further coiled and folded to eventually form a condensed chromosome.

Question 2

A human karyotype, as shown in the image, is used to:

Accepted Answer

Visualize and analyze the number and structure of chromosomes in a cell.

Question 3

Which statement about the structure of a duplicated chromosome is correct, based on the diagram provided?

Accepted Answer

A duplicated chromosome consists of two identical sister chromatids joined at a centromere.

Question 4

In the eukaryotic cell cycle diagram, which phase is characterized by DNA synthesis and chromosome duplication?

Accepted Answer

S phase

Question 5

During cytokinesis in a plant cell, as shown in the image, what structure forms to separate the two daughter cells?

Accepted Answer

A cell plate forms from vesicles, which develops into a new cell wall.

Question 6

Which of the following events occurs during metaphase of mitosis, as depicted in the images?

Accepted Answer

Chromosomes align at the equator of the cell, attached to spindle fibers.

Question 7

If a cell is observed with chromosomes lined up in the center and spindle fibers attached to each chromatid, which stage of mitosis is it in?

Accepted Answer

Metaphase

Question 8

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before proceeding to anaphase?

Accepted Answer

Metaphase-anaphase checkpoint

Question 9

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

Accepted Answer

Plant cells form a cell plate, while animal cells form a cleavage furrow.

Question 10

Which of the following best describes the G1 phase of the cell cycle?

Accepted Answer

A period of cell growth and differentiation before DNA synthesis.

Question 11

If a mutation prevents the formation of spindle fibers during mitosis, which stage would the cell be unable to complete?

Accepted Answer

Metaphase

Question 12

Which of the following equations correctly represents the DNA content of a cell in G2 phase compared to G1 phase?

Accepted Answer

$$2C_{G2} = 2 	imes C_{G1}$$

Question 13

A scientist observes a cell with two clusters of chromosomes at opposite poles and the beginning of nuclear envelope reformation. Which stage is this?

Accepted Answer

Telophase

Question 14

Which of the following is true about the chromosomes in a human karyotype?

Accepted Answer

Pairs 1-22 are autosomes, and pair 23 are the sex chromosomes.

Cell Cycle, Chromosome Structure, and Mitosis: Study Notes for BIOL 1001

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