Question 1

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

Accepted Answer

Prokaryotic chromosomes are circular and not associated with proteins, while eukaryotic chromosomes are linear and complexed with proteins.

Question 2

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

Accepted Answer

Anaphase

Question 3

A human somatic cell contains 46 chromosomes. After meiosis I, how many chromosomes and chromatids will each daughter cell contain?

Accepted Answer

$$23$$ chromosomes and $$46$$ chromatids

Question 4

Which of the following events is unique to meiosis and does NOT occur during mitosis?

Accepted Answer

Pairing of homologous chromosomes and crossing over

Question 5

A mutation disrupts the function of the centromere in a eukaryotic chromosome. Which process would be most directly affected?

Accepted Answer

Accurate segregation of chromosomes during cell division

Question 6

Which of the following best explains why sex chromosomes (X and Y) are not considered homologous in humans?

Accepted Answer

They differ in size, morphology, and genetic content.

Question 7

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

Accepted Answer

S phase

Question 8

A cell is observed to have chromosomes aligned at the metaphase plate, with spindle fibers attached to kinetochores from opposite poles. Which stage is this cell in?

Accepted Answer

Metaphase

Question 9

Which of the following statements about the nucleolus organizer region (NOR) is correct?

Accepted Answer

The NOR is a chromosomal region where ribosomal RNA genes are clustered and transcribed.

Question 10

Which of the following best describes the law of independent assortment as it applies to meiosis?

Accepted Answer

Homologous chromosomes orient randomly at the metaphase plate, leading to genetic variation in gametes.

Question 11

A researcher observes a cell with a cell plate forming at the center during cytokinesis. Which type of cell is most likely being observed?

Accepted Answer

Plant cell during mitosis

Question 12

Which of the following is a direct result of crossing over during meiosis?

Accepted Answer

Production of genetically unique gametes

Question 13

If a cell has a mutation that prevents the production of cyclin-dependent kinases (CDKs), what is the most likely consequence?

Accepted Answer

The cell cycle will not progress through key checkpoints, halting cell division.

Question 14

Which of the following best describes the difference between spermatogenesis and oogenesis in humans?

Accepted Answer

Oogenesis produces one functional gamete and polar bodies, while spermatogenesis produces four functional gametes.

Question 15

A cell is in G0 phase. Which of the following best describes its state?

Accepted Answer

It has exited the cell cycle and is not dividing.

Question 16

Which of the following equations correctly represents the change in chromosome number during meiosis?

Accepted Answer

$$2n \rightarrow n$$

Question 17

A geneticist is studying a chromosome with a centromere located very close to one end, resulting in a very short p arm and a long q arm. What is the term for this type of chromosome?

Accepted Answer

Acrocentric

Question 18

Which of the following is the primary function of cohesin proteins during mitosis?

Accepted Answer

To hold sister chromatids together until anaphase

Question 19

A patient is diagnosed with a genetic disorder caused by the loss of a chromosome from a diploid set. What is the term for this condition?

Accepted Answer

Monosomy

Question 20

During meiosis I, homologous chromosomes fail to separate. What is the most likely outcome in the resulting gametes?

Accepted Answer

Some gametes will have an extra chromosome, while others will be missing one.

Mitosis and Meiosis: Chromosomes, Cell Division, and Genetic Variation

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