Cellular & Sexual Reproduction (I): Question Preview (ID: 2207)

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By the end of prophase, each of the following has occured except ___________.
a) tighter coiling of the chromosomes b) breaking down of the nuclear envelope c) disappearing of the nucleolus d) lining up of chromosomes in the cell
Which of the following does not occur as a cell grows larger and larger?
a) difficulty obtaining nutrients b) difficulty eliminating wastes c) ratio of surface area to volume increases d) diffusion across the cell membrane is impaired
Why is the synthesis stage called this?
a) because protein synthesis is taking place b) because DNA synthesis is taking place c) because it combines several smaller stages into one d) because the chromosomes come together
A cell has 12 chromosomes. How many chromosomes will each daughter cell have?
a) 4 b) 6 c) 12 d) 24
The cell cycle is regulated by __________.
a) cyclins b) enzymes c) hormones d) sugars
Cancer cells can reproduce rapidly because they
a) are smaller than normal cells. b) bypass interphase. c) undergo mitosis faster. d) spend less time in interphase.
What is cancer caused by?
a) cell-membrane damage b) metabolic poisoning c) mutation d) immune-system damage
Prokaryotes divide by binary fission, a form of asexual reproduction in which
a) the nucleus divides into two nuclei. b) the number of chromosomes in the cell is reduced. c) a cell divides into two cells with identical genetic information. d) spindle fibers attach to the poles of the cell.
It is often said that normal cells change into cancerous cells frequently in our bodies. Which of the following explanations accounts for the relative rarity of cancer?
a) The cancerous cells die on their own. b) The DNA repair system fixes the mutation that causes cancer. c) The cancer cells grow only very slowly at first. d) The cancerous cells are normally crowded out by normal cell growth.
What is the role of cyclin-dependent kinases in the cell cycle?
a) They stop the cycle if something has gone wrong. b) They catalyze the condensation of the chromosomes. c) They provide the energy for the actions of the spindle fibers. d) They initiate various stages of the cell cycle.
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