AP Bio Unit 7: The Cell Cycle

A new mutation that arose in one copy of gene x in a somatic cell resulted in a tumor. Which of the following pieces of evidence best describes how the new mutation directly caused the tumor?

A: Protein x normally stimulates cell division and the mutation created an overactive version of protein x.

DNA Replication occurs

A: during the S phase of the cell cycle

Which of the following occurs in all species of living organisms and may lead to an increase in genetic variation?

A: Mutations in the genome

What would this cell look like after meiosis 2?

B

What would this cell look like in the beginning of mitosis?

B

The processes illustrated in the models depicted above all result in which of the following?

B: an increase in genetic variation

The vertebrae forelimb initially develops in the embryo as a solid mass of tissue. As development progresses, the solid mass near the end of the forelimb is remodeled into individual digits. Which of the following best explains the role of apoptosis in remodeling of the forelimb?

B: apoptosis involves the regulated activation of proteins in specific cells of the developing forelimb that leads to the death of those cells.

What would this cell look like after meiosis 1?

C

Within a forest ecosystem, there is a large amount of diversity among members of a warbler species. Of the following stages of meiosis illustrated for a typical cell, which contributes most to diversity among the warblers?

C

Cancer can result from a variety of different mutational events. Which of the following is LEAST likely to result in the initiation of a cancerous tumor?

C: a defect in a cell cycle checkpoint prevents a cell from entering S phase.

If chemical signals in the cytoplasm control the progression of a cell to the M phase of the cell cycle, then fusion of a cell in G1 with a cell in early M phase would most likely result in the

C: condensation of chromatin in preparation of nuclear division

What would a daughter cell at the end of mitosis look like?

D

The process depicted in the image above is best summarized by which of the following descriptions

D: During meiosis, crossing over leads to recombination of alleles between homologous chromosomes