Explain how chromatin remodeling can involve changes to DNA instead of histones What will be an ideal response?
ANSWER: The addition of methyl groups to cytosine bases in the DNA of promoters turns genes off by
a process called gene silencing. The presence of methyl groups may prevent the binding of
transcriptional proteins to the gene, and methylated DNA binds to non-histone proteins that
promote the formation of genetically inactive chromatin, termed silent chromatin.
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A) a hexose B) a pentose C) a phosphate D) fructose E) maltose
Which of the following is not a phase of the Calvin-Benson Cycle?
A. Carboxylation phase B. Oxidation phase C. Regeneration phase D. Reduction phase
You are studying an ecosystem on your campus. After a solid base of carefully observed and described facts, your
next step would be to ____.
a. make more observations b. make a hypothesis c. share your data with others d. wait for instructions e. design an experiment
Renal failure may result from
a. complications of diabetes b. high blood pressure c. damaged blood vessels in the kidneys. d. pesticide, lead, or arsenic exposure e. all of these.