Q: Which of the following equations correctly represents the DNA content of a cell during the S phase compared to G1?

$$D_{S} \u003e D_{G1}$$,\ \text{but less than}\ 2 \times D_{G1}$

Question 1

Which of the following best describes the main function of mitosis in multicellular organisms?

Accepted Answer

To generate new, identical cells for growth, development, and tissue renewal

Question 2

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

Accepted Answer

S phase

Question 3

Which structure is responsible for organizing microtubules during mitosis in animal cells?

Accepted Answer

Centrosome

Question 4

A scientist observes a cell with condensed chromosomes aligned at the center of the cell, spindle fibers attached to kinetochores, and the nuclear envelope dissolved. Which phase of mitosis is being observed?

Accepted Answer

Metaphase

Question 5

Which cytoskeletal element is directly involved in the pinching of the membrane during cytokinesis in animal cells?

Accepted Answer

Actin microfilaments

Question 6

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

Accepted Answer

Cell plate

Question 7

Which of the following best explains why binary fission is different from mitosis?

Accepted Answer

Binary fission is the process by which prokaryotes divide, lacking a nucleus

Question 8

A mutation disrupts the function of cohesin proteins during mitosis. What is the most likely consequence?

Accepted Answer

Sister chromatids separate prematurely

Question 9

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

Accepted Answer

$$D_{S} \u003e D_{G1}$$,\ 	ext{but less than}\ 2 	imes D_{G1}$

Question 10

A patient is treated with methotrexate, a drug that inhibits DNA synthesis. Which phase of the cell cycle will be most directly affected?

Accepted Answer

S phase

Question 11

Which of the following best describes the role of the nucleolus during interphase?

Accepted Answer

It is the site of ribosome production

Question 12

A lizard loses its tail and regenerates it over time. Which cellular process is most responsible for the regrowth of the tail?

Accepted Answer

Mitosis

Question 13

Which of the following is a key difference between mitosis and meiosis?

Accepted Answer

Mitosis maintains chromosome number, meiosis reduces it by half

Question 14

Which scientist is known for her research on melanin pigment granules and advocacy for underrepresented groups in science?

Accepted Answer

Jewel Plummer-Cobb

Question 15

If a mutation prevents the formation of the cell plate during plant cell cytokinesis, what is the most likely outcome?

Accepted Answer

The cell will form two nuclei but remain as one cell

Question 16

Which of the following best describes the role of microtubules during mitosis?

Accepted Answer

They organize and move chromosomes

Question 17

A cell is observed with a visible nucleolus, relaxed chromatin, and intact nuclear envelope. Which phase is this cell most likely in?

Accepted Answer

Interphase

Question 18

Which of the following is NOT a purpose of cell division in multicellular organisms?

Accepted Answer

Increasing genetic diversity through crossing over

Question 19

Which of the following best explains why methotrexate is effective as a cancer treatment?

Accepted Answer

It inhibits DNA synthesis, preventing cancer cells from dividing

Question 20

Which of the following correctly matches a cell cycle phase with its main event?

Accepted Answer

S phase: DNA synthesis

The Cell Cycle: Structure, Phases, and Cellular Division

Guida di studio - Domande di pratica

Study guide - Flashcard