Why could HIV viruses be considered a cost of sexual reproduction? Keep your answer to one sentence
What will be an ideal response?
ANS:
HIV is sexually transmitted; the risk of acquiring an HIV infection is one of the costs of sex.
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Why are vasodilation and vasoconstriction the main mechanisms to change blood flow?
A. Blood vessel length is relatively fixed and has no effect on blood flow. B. Blood hematocrit has no effect on blood flow. C. Leakage of fluids from the capillaries has no effect on blood flow. D. Sympathetic activation has no effect on blood flow.
All of the products of the light-dependent
reactions of photosynthesis listed below are used in the light-independent reactions EXCEPT for a. O2. b. electrons. c. NADPH. d. ATP. e. hydrogen protons contributed by NADPH.
A(n) ________ is composed of one sugar (deoxyribose or ribose), one phosphate, and one nitrogenous base
Fill in the blank(s) with correct word
Serves as an intracellular second-messenger molecule
a. Adenylate cyclase b. G-protein c. Carrier protein d. cAMP e. Ion channel receptor protein