Question 1

Which of the following best describes the relationship between chromatin, nucleosomes, and chromosomes in eukaryotic cells?

Accepted Answer

DNA wraps around histone proteins to form nucleosomes, which assemble into chromatin; chromatin condenses to form chromosomes during cell division.

Question 2

A cell is observed to have chromosomes aligned at the metaphase plate, with microtubules attached to kinetochores. Which checkpoint is the cell most likely preparing to pass?

Accepted Answer

M (spindle) checkpoint

Question 3

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

Accepted Answer

46 chromosomes and 46 chromatids

Question 4

Which of the following events occurs during the S phase of interphase?

Accepted Answer

DNA is replicated, resulting in two sister chromatids joined at a centromere.

Question 5

A chemotherapeutic drug inhibits the assembly of microtubules. Which phases of the cell cycle would be most directly affected?

Accepted Answer

Metaphase and anaphase

Question 6

Which of the following best explains why cancer cells are considered 'immortal' compared to normal cells?

Accepted Answer

They evade apoptosis and continue dividing even with significant DNA errors.

Question 7

A cell fails to pass the G$$_2$$ checkpoint due to incomplete DNA replication. What is the most likely outcome for this cell?

Accepted Answer

It will attempt to repair the DNA or undergo apoptosis if repair is not possible.

Question 8

Which of the following is a key difference between benign and malignant tumors?

Accepted Answer

Malignant tumors lose anchorage dependence and can spread to other tissues.

Question 9

Which of the following best describes the role of cyclin-dependent kinases (CDKs) in the cell cycle?

Accepted Answer

CDKs are enzymes that are active only when bound to their specific cyclin, phosphorylating target proteins to regulate the cell cycle.

Question 10

A researcher observes that a cell has entered a non-dividing state after failing the G$$_1$$ checkpoint. Which phase has the cell entered?

Accepted Answer

G$$_0$$ phase

Question 11

Which of the following is a real-world example of contact inhibition in cell biology?

Accepted Answer

A wound healing process where cells stop dividing once the wound is closed.

Question 12

Which of the following best explains why DNA must be packaged into chromosomes before cell division?

Accepted Answer

To allow for easier separation and distribution of genetic material during mitosis.

Question 13

A mutation causes a cell to ignore the M (spindle) checkpoint. What is a likely consequence?

Accepted Answer

Chromosomes may not be properly attached to the spindle, leading to unequal chromosome distribution.

Question 14

Which of the following is true regarding homologous chromosomes in a human somatic cell?

Accepted Answer

They have the same length, centromere position, and carry genes for the same traits.

Question 15

Which of the following best describes the process of cytokinesis in plant cells?

Accepted Answer

Vesicles from the Golgi apparatus form a cell plate in the middle of the cell.

Question 16

Which equation correctly represents the chromosome number in a diploid human cell after DNA replication but before mitosis?

Accepted Answer

$$2n = 46$$ chromosomes, $$92$$ chromatids$

Question 17

Which of the following is a function of the centromere during mitosis?

Accepted Answer

It is the region where sister chromatids are most closely attached and where kinetochores form.

Question 18

A cell is exposed to a growth factor. What is the most likely cellular response?

Accepted Answer

The cell will activate CDKs and progress through the cell cycle.

Question 19

Which of the following best explains why regular cancer screenings are important for cancer prevention?

Accepted Answer

They can detect mutations early, allowing for intervention before cells become malignant.

The Cell Cycle: Structure, Function, and Regulation

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