High School Biology : Understanding Stages of Mitosis

Study concepts, example questions & explanations for High School Biology

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Example Questions

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Example Question #21 : Mitosis

What are two major events that occur in prometaphase? 

Possible Answers:

The nuclear envelope breaks apart, the mitotic spindle reaches the chromosomes.

The spindle is only beginning to form and the chromosomes are lined up on the metaphase plate.

Chromosomes become condensed and the nuclear envelope breaks down.

The nuclear envelope is still intact and the chromosomes become condensed.

Correct answer:

The nuclear envelope breaks apart, the mitotic spindle reaches the chromosomes.

Explanation:

During premetaphase the nuclear envelop has broken down and this allows the spindle, or the microtubules, begin to attach to the chromosomes at the kinetochore. The microtubules begin to put force on the chromosomes to begin moving them to the middle of the cell.

Example Question #21 : Understanding Stages Of Mitosis

What is interphase?

Possible Answers:

The phase when the actual cell division occurs. 

The phase when the cell begins preparations for mitosis.

The cell arrest phase.

It is the first phase of mitosis.

None of these.

Correct answer:

The phase when the cell begins preparations for mitosis.

Explanation:

It is important to remember that interphase is not actually a part of mitosis, but rather is the preparation phase, setting the stage for mitosis to occur. Cells spend most of their time in this phase. During interphase the cells make copies of its structures and duplicates its chromosomes during DNA synthesis. The G1, S phase, and G2 phase all make up interphase, (if you remember from the previous question). 

Example Question #181 : Cell Biology

Please name the first stage of mitosis and two things that occurs during this phase. 

Possible Answers:

Metaphase; the spindle is fully formed.

Telophase; chromosomes line up on the spindle.

Metaphase; the nuclear envelope breaks down.

Prophase; the mitotic spindle forms and chromosomes become more pronounced.

Prophase; chromosomes line up on the spindle.

Correct answer:

Prophase; the mitotic spindle forms and chromosomes become more pronounced.

Explanation:

Prophase is the first stage of mitosis. The cell cytoplasm and nucleus undergo several changes. At this point the mitotic spindle is forming but the nucleus is still intact. In this phase the chromosomes become tightly packed and the nucleoli disappear. Each chromosome is paired with its sister chromatid joined in the middle at the centromere. 

Prophase

Example Question #22 : Understanding Stages Of Mitosis

Metaphase

What phase is the cell above currently in? How can you tell?

Possible Answers:

Metaphase; you can tell because the chromosomes are neatly lined up in the center of the cell on the mitotic spindle.

Telophase; you can tell because there is no nuclear envelope anymore.

Prophase; you can tell because of the cell's shape.

Prometaphase; you can tell because there is no nuclear envelope anymore.

Anaphase; you can tell because the chromosomes are neatly lined up in the center of the cell on the mitotic spindle.

Correct answer:

Metaphase; you can tell because the chromosomes are neatly lined up in the center of the cell on the mitotic spindle.

Explanation:

The condensed chromosomes are aligned on the metaphase plate (an imaginary line in the middle of the cell). They align this way because of the microtubules that are pulling them to the opposite sides. 

Example Question #23 : Understanding Stages Of Mitosis

Premetaphase

In what stage of mitosis is the cell shown in?

Possible Answers:

Anophase

Prophase

Telophase

Prometaphase

Metaphase

Correct answer:

Prometaphase

Explanation:

The cell in the picture about is in the prometphase stage. Key indicators of this phase are the breakdown of the nuclear envelope around the genetic material and the spindle beginning to interact with the chromosomes.

Example Question #181 : Cell Biology

Prophase

In what phase of mitosis is the cell shown?

Possible Answers:

Anaphase

Telophase

Prophase

Cytokinesis

Metaphase

Correct answer:

Prophase

Explanation:

The cell pictured above is in prophase. Key indicators that the cell is in this stage are that the nuclear envelope is still intact and chromosomes have become condensed and paired up with sister chromatids.

Example Question #23 : Cell Division

 

What is the difference in chromosome number, in each daughter cell, between mitosis and meiosis?

Possible Answers:

Both mitosis and meiosis end with two diploid cells.

Both mitosis and meiosis process end with two haploid cells.

Mitosis ends in a diploid cell and meiosis ends in a haploid cell.

Meiosis ends in a dipliod cell and mitosis ends with a haploid cell.

Mitosis ends with two diploid cells and meiosis ends with 4 haploid cells.

Correct answer:

Mitosis ends with two diploid cells and meiosis ends with 4 haploid cells.

Explanation:

Mitosis has only one round of chromosome separation and creates all cells, other than sex cells. For example skin cells. This process ends with two diploid cells that are genetically identical to the parent cell.

Meiosis is the process that generates the cells that occur in sexual reproduction cells, otherwise known as gametes. This process, since it has two rounds of chromosome separation, will end with 4 haploid cells, or half the genetic information of the parent cell.

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