Describe the general relationship that may exist between mutations and cancer
What will be an ideal response?
Control of the cell cycle is dependent on a variety of gene-produced proteins such as kinases and cyclins and related factors. Mutations in genes that encode these proteins may disrupt normal cell-cycle control. The G1 checkpoint is altered in some forms of cancer, and mutant cyclins have been shown to be related to a gene product that is overexpressed in some forms of leukemia. Nonmutant genes often suppress the formation of cancer by exerting control over the cell cycle. When mutant, such control may be lost.
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An enzyme has a total of four active sites. When you denature the molecule and study its composition, you find that each active site occurs on a different polypeptide. Which of the following hypotheses does this observation support?
A) The enzyme is subject to regulation. B) The enzyme requires a cofactor to function normally. C) The protein's structure is affected by temperature and pH. D) The protein has quaternary structure.
Where is the primary meristem located?
A. Dermal tissue. B. Vascular tissue. C. Woody stem. D. Root and stem tips. E. Stem tip only.
Check all of the reasons that temperature is important for organisms.
_____ It affects the rate of biochemical reactions. _____ It affects the fluidity and rigidity of plasma membranes. _____ It has a direct effect on blood cell production.
What kind of symbiosis occurs between bioluminescent bacteria and its host?
a. Commensalism b. Mutualistic c. None of these choices d. Parasitism