biology chapter 9 Flashcards


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1

If a eukaryotic cell is in the G1 phase of the cell cycle, which statement about the cell’s chromosomes must be correct?

Each chromosome is made of a complex of DNA and associated proteins

2

Which statement provides the best description of the interphase portion of the cell cycle?

During interphase, a cell is metabolically active.

3

Why is it difficult to observe individual chromosomes with a light microscope during interphase?

They have uncoiled to form long, thin strands

4

Which of the following is true of benign tumors, but not malignant tumors?

They remain confined to their original site

5

A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?

92

6

Which of the following is true of kinetochores?

They are sites at which microtubules attach to chromosomes.

7

Cells will usually divide if they receive the proper signal at a checkpoint in which phase of the cell cycle?

G1

8

Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely

a plant cell in the process of cytokinesis.

9

Which of the following does not occur during mitosis

replication of the DNA

10
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The unlettered circle at the top of the figure shows a diploid nucleus with four chromosomes that have not yet replicated. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is black, and the other is gray. The circles labeled AE show various combinations of these chromosomes.

What is the correct chromosomal condition for one daughter nucleus at telophase of mitosis?

E.

11
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In the figure, mitosis is represented by which numbered part(s) of the cycle?

IV

12
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Which number represents DNA synthesis?

II

13

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

G1 Follows cell division

14

In some organisms, such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this?

large cells containing many nuclei

15

Which of the following is found in binary fission but not in mitosis?

Duplicated chromosomes attach to the plasma membrane.