Quiz 9 Fall 07 MCB181R Dr. Jorstad

Quiz 9 Fall 07 MCB181R Dr. Jorstad - Question 3 1 / 1 point...

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Regarding the cell cycle, which of the following statements is/are true? DNA is replicated during the S phase. Cell division occurs in the M phase. Growth in cell volume, and synthesis of organelles and cell structures takes place in G1. Once the cell has passed the S phase, cell division cannot be halted. Question 2    1 / 1 point Cell division in prokaryotes and eukaryotes differs in some ways, and is similar in others. Which of the following statements  is/are correct about this topic? In both cases, each chromosome has a single origin of replication. In both kinds of cells, DNA and other cell components must be duplicated. Initiation of cell division always requires some kind of signal. In both cases, the chromosomes are guided by microtubule spindle fibers.
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Unformatted text preview: Question 3 1 / 1 point Regarding the regulation of cell division, cyclins are signals to turn cell division "on". when cyclins bind to Cdk, they activate Cdk, which can then phosphorylate RB. active RB is a molecule that keeps cells in G1. the default is for cell division to be "off" for most cells. Question 4 1 / 1 point Cancer cells often have mutated genes whose normal function is to regulate the cell cycle. are cells whose cell cycle is no longer being controlled. don't need "on" signals in order to divide. are foreign cells that invade our bodies and attack our own cells. Question 5 1 / 1 point...
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This homework help was uploaded on 04/14/2008 for the course MCB 181 taught by Professor Jorstad during the Fall '07 term at University of Arizona- Tucson.

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Quiz 9 Fall 07 MCB181R Dr. Jorstad - Question 3 1 / 1 point...

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