Pigment can be found in several layers of the epidermis. In which layers would you expect to find the cells that produce melanin?
a. stratum granulosum
b. stratum lucidum
c. stratum basale
d. stratum spinosum
Ans: c. stratum basale
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Evaluate the following statement about heat: Heat is released in all energy conversion processes as a byproduct.
A. False, heat is released in most but not all energy conversion processes. B. False, heat is never released as a byproduct. C. True. D. False, heat is released as a byproduct only in a few energy conversion processes.
Which of the following is not true of the regulation of the arabinose operon?
A. CRP activates expression when bound to cAMP. B. AraC protein recruits RNA polymerase when bound to arabinose. C. Arabinose binds to AraC protein, decreasing its affinity for a DNA site near the promoter. D. Arabinose binding alters the conformation of the dimerization domain of the AraC protein.
Estrogen is most likely to exert its effects by regulating
A. protein kinases. B. phopholipase C. C. expression of genes and production of specific proteins. D. cyclic AMP. E. Ca2+.
A typical systolic pressure for a normal adult is ____.
A. 60 mm Hg B. 80 mm Hg C. 100 mm Hg D. 120 mm Hg E. 140 mm Hg