High School Biology : Cell Division

Study concepts, example questions & explanations for High School Biology

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Example Questions

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Example Question #111 : Cell Division

Most cells spend the vast majority of their time in __________.

Possible Answers:

mitosis

anaphase I

meiosis

interphase

prophase

Correct answer:

interphase

Explanation:

Most cells spend about 90% of their time in interphase. Note that mitosis and meiosis comprise only about 10% of the cell cycle.

Example Question #1 : Understanding Cell Cycle Regulation

During the G1 phase of the cell cycle, in which form will Eukaryotic DNA be found?

Possible Answers:

Chromatid

Unfolded continuous strand

Plasmid

Chromosomes

Chromatin

Correct answer:

Chromatin

Explanation:

Chromosomes and Chromatid are both incorrect because eukaryotic DNA is condensed into these tightly packed chromosomal structures during M phase of mitosis. Plasmids are not found in eukaryotes and an unfolded continuous strand of DNA would be too long to fit within a nucleus. Thus, Chromatin is the correct answer choice; chromatin is a protein-DNA complex in a loosely packed form which allows for gene transcription which is necessary during the G1 phase of the cell cycle. 

Example Question #3 : Understanding Cell Cycle Regulation

What is the initial checkpoint in a mammalian cell cycle whose major function is to allow or disallow a cell to mitotically divide?

Possible Answers:

S checkpoint

G3 checkpoint

M checkpoint

G1 checkpoint

Gcheckpoint

Correct answer:

G1 checkpoint

Explanation:

The GCheckpoint is the correct answer, because if a cell gets a signal at this checkpoint then the cell goes on to complete the S, G2, and M phases and will end up dividing. If this signal is not received at the G1 checkpoint then the cell enters the non-dividing Gphase.

Example Question #1 : Understanding Cell Cycle Regulation

There are several checkpoints during the cell cycle to ensure proper growth and division. Which checkpoint of the cell cycle is considered the "point of no return?"

Possible Answers:

Telophase checkpoint

G1 checkpoint

There is no point of no return. The cell can always go back and resume normal cell function. 

Metaphase checkpoint

G2 checkpoint

Correct answer:

G1 checkpoint

Explanation:

Once the cell passes the G1 checkpoint, the cell becomes committed to the cell cycle and enters the S phase where DNA is replicated. The checkpoint is to ensure the cell has grown enough and has enough resources to begin DNA replication. The next checkpoint is the G2 checkpoint, where the cell checks and makes sure the DNA replicated correctly before beginning mitosis. If the cell does not pass this checkpoint, it commences apoptosis and dies. 

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