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Question set 5

Question set 5 - replicating all the time Radiation...

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Hank Greene Question Set 5 1. The chemical go-ahead signal at G2 is a certain concentration of cyclin and cyclin dependant kinases (CDK). Once there is enough cyclin produced, it bonds to its CDK and becomes maturation-promoting factor, which triggers the cell’s passage past the G2 checkpoint and into metaphase. 2. Taxol freezes the mitotic spindle using depolymerization. Polymers are just long chains of like molecules, and since microtubules are just long chains of proteins, or polymers. So by depolymerizing the proteins that make up the microtubules, the mitotic spindles aren’t able to separate the chromatids, and mitosis is stopped after metaphase. 3. Because most cells in the body are in G 0 phase, they aren’t actively replicating. However hair cells, stomach and intestinal cells, and white blood cells all actively
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Unformatted text preview: replicating all the time. Radiation prevents these cells from replicating because the cell’s DNA is destroyed 4. Benign tumors don’t perform metastasis, while malignant tumors are able to detach from their anchors, they don’t have a metabolism and have odd numbers of chromosomes. 5. there are 225 possible combinations 6. A karyotype is a picture of condensed chromosomes arranged in pairs. Karyotyping is useful because specific chromosomes and parts of chromosomes can be identified. 7. This switch evolved because there is less variation produced in offspring when an organism reproduces a-sexually as opposed to gaining another set of chromosomes when reproducing sexually, creating more variation and a better chance of survival for the offspring....
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