Understanding Cell Cycle and Mitosis

During which stage of mitosis do the chromosomes line up in the middle of the cell?

• Prophase

• Metaphase

• Anaphase

• Telophase

Answer explanation

During metaphase, chromosomes align at the cell's equatorial plane, ensuring they are properly positioned for separation. This is a key step before the chromosomes are pulled apart in anaphase.

Which of the following is a function of mitosis?

• Production of gametes

• Growth and repair of tissues

• Exchange of genetic material

• Reduction of chromosome number

Answer explanation

Mitosis is primarily responsible for the growth and repair of tissues by producing identical daughter cells. In contrast, gamete production occurs through meiosis, and the exchange of genetic material and reduction of chromosome number are also meiosis functions.

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Why is cell division important for multicellular organisms?

• It allows for the exchange of gases

• It helps in the digestion of food

• It enables growth and repair

• It provides energy to cells

Answer explanation

Cell division is crucial for multicellular organisms as it enables growth and repair. Through this process, new cells are produced to replace damaged ones and to allow the organism to grow, ensuring proper function and health.

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Describe what happens during anaphase of mitosis.

• Chromosomes condense and become visible

• Chromosomes align at the cell equator

• Sister chromatids are pulled apart to opposite poles

• Nuclear envelope re-forms around chromosomes

Answer explanation

During anaphase of mitosis, sister chromatids are pulled apart to opposite poles of the cell, ensuring that each new daughter cell will receive an identical set of chromosomes.

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How does mitosis contribute to genetic stability?

• By reducing the chromosome number by half

• By ensuring each daughter cell receives an identical set of chromosomes

• By allowing for genetic variation through crossing over

• By producing genetically diverse cells

Answer explanation

Mitosis ensures genetic stability by producing two daughter cells that each receive an identical set of chromosomes from the parent cell. This process maintains the chromosome number and genetic information across generations.

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NGSS.HS-LS1-4

Identify the phase of mitosis where the nuclear envelope breaks down.

• Prophase

• Metaphase

• Anaphase

• Telophase

Answer explanation

During prophase, the nuclear envelope breaks down, allowing the chromosomes to condense and become visible. This is a key event that prepares the cell for the subsequent stages of mitosis.

Which stage of mitosis is characterized by the reformation of the nuclear envelope?

• Prophase

• Metaphase

• Anaphase

• Telophase

Answer explanation

Telophase is the stage of mitosis where the nuclear envelope reforms around the separated sets of chromosomes, marking the near end of cell division.

What phase of mitosis is occuring in the picture?

• Prophase

• Metaphase

• Cytokinesis

• Telophase

Answer explanation

In metaphase, chromosomes align at the cell's equatorial plane, making them visible and distinct. This phase is characterized by the arrangement of chromosomes along the metaphase plate, which is why the correct answer is 'Metaphase'.

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What is the role of spindle fibers during mitosis?

• They dissolve the nuclear envelope

• They attach to chromosomes and help separate sister chromatids

• They provide energy for cell division

• They help in the condensation of chromosomes

Answer explanation

Spindle fibers are crucial during mitosis as they attach to chromosomes at the kinetochores and help separate sister chromatids, ensuring proper distribution of genetic material to daughter cells.

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During which phase of mitosis does the cell prepare for division by replicating its DNA?

• Prophase

• Metaphase

• Anaphase

• Interphase

Answer explanation

The cell prepares for division by replicating its DNA during Interphase, which occurs before mitosis begins. Prophase, Metaphase, and Anaphase are stages of mitosis where the cell is already in the process of division.

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