Bio Ch 12.1

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The centromere is a region in which

A) chromatids remain attached to one another until anaphase

What is a chromatid?

B) a replicate chromosome

What is the name for the special region on a duplicated chromosome that holds the sister chromatids together?

B) centromere

Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells?

D) 32

If there are 20 chromatids in a cell, how many centromeres are there?

A) 10

Which of the following statements is not true?

E) The mitotic spindles in prokaryotic cells are composed of microtubules.

If cells in the process of dividing are subjected to colchicine, a drug that interferes with the functioning of the spindle apparatus, at which stage will mitosis be arrested?

D) metaphase

A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes?

D) 46

If the cell, whose nuclear material is shown in the figure below, continues toward completion of mitosis, which of the following events would occur next?

D) formation of telophase nuclei

All of the following occur during prophase of mitosis in animal cells except

D) chromosomes are duplicated.

If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?

B) 20

If there are 20 chromatids in a cell at metaphase, how many chromosomes are there in each daughter cell following cytokinesis?

A) 10

Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that

A) gamma contains more DNA than beta.

The best conclusion concerning delta is that the cells

D) are actually in the G0 phase.

How is the S phase of the cell cycle measured?

B) determining the length of time during which DNA synthesis occurred in the cells

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?

B) centrosome

All of the following occur during mitosis except the

D) synthesis of DNA.

If a cell has 8 chromosomes at metaphase of mitosis, how many chromosomes will it have during anaphase?

E) 16

Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cell with

D) two nuclei.

Regarding mitosis and cytokinesis, one difference between higher plants and animals is that in plants

C) a cell plate begins to form at telophase, whereas in animals a cleavage furrow is initiated at that stage.

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