Question 1

Which phase of the eukaryotic cell cycle is responsible for DNA replication, and what would happen if this phase did not occur before cell division?

Accepted Answer

S phase; daughter cells would lack full sets of chromosomes, leading to loss of genetic information and cell malfunction.

Question 2

During which stage of mitosis do chromosomes align at the metaphase plate, and what is the significance of this alignment?

Accepted Answer

Metaphase; alignment ensures each daughter cell receives one copy of each chromosome.

Question 3

Which two types of biomacromolecules are found in chromosomes, and what are their functions?

Accepted Answer

DNA and proteins; DNA stores genetic information and proteins organize/regulate DNA.

Question 4

A diploid cell with 2 pairs of chromosomes (2n = 4) undergoes mitosis. What is the amount of DNA in each daughter cell compared to the original parent cell before replication?

Accepted Answer

Each daughter cell has the same amount of DNA as the original parent cell before replication.

Question 5

Which equation best represents the relationship between the number of chromosomes before and after DNA replication in a diploid cell?

Accepted Answer

$$2n \rightarrow 2n ($$chromosome number stays the same, but each chromosome is replicated)

Question 6

Which process do bacteria use to divide, and how does it differ from mitosis in eukaryotic cells?

Accepted Answer

Binary fission; it involves DNA replication, segregation, and cell splitting without mitotic spindle or complex phases.

Question 7

What is the primary function of the cell cycle checkpoints, and why are they important for human health?

Accepted Answer

To halt the cell cycle if molecular criteria are not met; this prevents diseases like cancer by controlling cell division.

Question 8

Which stage of mitosis is characterized by the splitting of centromeres and the movement of chromosomes toward opposite poles?

Accepted Answer

Anaphase

Question 9

In plant cells, what structure forms during cytokinesis to separate the daughter cells?

Accepted Answer

Cell plate

Question 10

Which of the following statements about chromosomes is correct?

Accepted Answer

A chromosome contains many genes.

Question 11

If a eukaryotic cell fails to complete the G2 phase checkpoint, what is the most likely outcome?

Accepted Answer

The cell will proceed to mitosis with unreplicated DNA, resulting in daughter cells with incomplete genetic material.

Question 12

Which of the following best describes the genome of an organism?

Accepted Answer

All the DNA that makes up an organism, like its complete instruction book.

Question 13

What is the main event that distinguishes the S phase from the G1 phase in the cell cycle?

Accepted Answer

DNA replication occurs in S phase, while cell growth occurs in G1 phase.

Question 14

Which of the following is a correct sequence of events during mitosis?

Accepted Answer

Prophase → Metaphase → Anaphase → Telophase

Question 15

Which cellular process ensures that each new cell receives the same genetic instructions as the original cell?

Accepted Answer

DNA replication

Question 16

What is the function of kinetochores during mitosis?

Accepted Answer

They attach spindle microtubules to chromosomes, facilitating chromosome movement.

Question 17

Which phase of the cell cycle is most likely to be affected in cancer cells, leading to uncontrolled cell division?

Accepted Answer

Cell cycle checkpoints

Question 18

If a cell contains four unreplicated chromosomes during G1, how many replicated chromosomes will it contain after S phase?

Accepted Answer

Four replicated chromosomes

Question 19

Which of the following best describes the relationship between genes, chromosomes, and the genome?

Accepted Answer

Genes are sections of DNA found on chromosomes, and the genome is the complete set of chromosomes in an organism.

The Cell Cycle and Transmission of Genetic Information

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