DNA, Cell Cycle

The diagram below shows the cell cycle. Which of the following activities occurs in the G1 phase?

• growth of the cell

• replication of the DNA

• formation of the mitotic spindle

• breakdown of the nuclear membrane

During which of the following stages shown in Figure 5.1 do the nucleus and cytoplasm of a cell divide?

• Gap 1

• Synthesis

• Gap 2

• Mitosis

CDK and cyclins are internal factors that

• cause cells to die

• controls the cell cycle

• cause cancer cells to break away.

• prevent mitosis from occuring

The illustration below shows a phase of mitosis. Which of the following statements describes what is occurring in this phase?

• The chromosomes are duplicating their DNA.

• The copies of each chromosome are separating.

• The chromosomes are moving toward the center of the cell.

• The homologous chromosomes are preaparing for crossing over.

Which statement describes the chromosome shown in Figure 5.2?

• It is made up of two histones.

• It is made up of two chromatids.

• It is made up of two centromeres.

• It is made up of two telomeres.

Some unicellular protists, such as dinoflagellates, use mitosis to reproduce. Which of the following statements describes the offspring?

• The offspring are twice as large as the parent.

• The offspring are genetically identical to the parent.

• The offspring develop from a parent’s fertilized egg.

• The offspring have half as many chromosomes as the parent.

The diagram below provides information about a carrot cell. A carrot cell contains 18 chromosomes. Which of the following diagrams illustrates the correct number of chromosomes in new cells produced by mitosis?

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Figure 9-4 illustrates which stage of mitosis?

• anaphase

• metaphase

• prophase

• telophase

Which of the following models most accurately represents the structure of DNA

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A nucleotide consists of

• a sugar, a protein, and adenine.

• a sugar, an amino acid, and starch.

• a sugar, a phosphate group, and a nitrogen base.

• a starch, a phosphate group, and a nitrogen base.