Miller and Urey's initial simulation resulted in the formation of which one of the following?
A. DNA
B. glucose
C. RNA
D. phospholipids
E. amino acids
Answer: E
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Iron response elements form:
A. RNA hairpin structures. B. DNA stem loop structures. C. poly(A) binding sites. D. iron reducing clusters.
How do protein kinases generally activate their target proteins?
A) The process of phosphorylation causes the target proteins to change conformation. B) The kinases bind to target proteins directly, forming a complex that activates the proteins and lets them change conformation. C) Kinase concentrations vary during the cell cycle, so that proteins are activated only when kinase levels are high. D) Kinases bind to target proteins and inactivate them, so kinase levels must drop for target protein activation. E) The process of dephosphorylation causes the target proteins to change conformation.
After a person has taken antibiotics to treat a yeast infection in the genitourinary tract, the yeast infection lessens and the microbes that are normally present reestablish themselves. The reason for the lessening of the yeast infection is explained by
A. predation. B. symbiosis. C. the competitive exclusion principle. D. the co-inclusion principle. E. endosymbiosis.
Describe three genetic mechanisms whereby proto-oncogenes can become overexpressed
What will be an ideal response?