____ carries protein-assembly instructions from the nucleus to the cytoplasm
a. Template DNA
b. Messenger RNA
c. Transfer RNA
d. Ribosomal RNA
e. Total RNA
ANSWER: b
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If modern humans came from Africa, what explains the loss of pigmentation seen in different races?
A. Since there was less sunlight, darker pigmentation wasn't needed. B. The lighter-pigmented humans are found in colder climates, where having less pigmentation preserves heat. C. The diet found in the areas where lighterpigmented humans are found contain compounds that interfere with the production of pigmentation. D. Lighter pigment allows for more efficient production of vitamin D, an advantage in areas with less sunlight. E. None of the answer options is correct.
Cavitation can occur when what happens?
A. Root pressure pushes water up the xylem. B. Starch grains block the sieve tubes. C. Gas bubbles expand inside a tracheid or vessel member. D. Stomata get stuck closed. E. Clouds block sunlight shining on the leaves.
You have just moved from Norfolk, Virginia (sea level), to Taos, New Mexico (high in the
mountains), and you find yourself out of breath climbing a small hill. Three months later, climbing the same hill, you have no difficulty. In the interim you have not altered your level of activity or diet. Which hormone has been at work? a. angiotensin b. erythropoietin c. aldosterone d. estrogen e. anti-diuretic hormone
How many electrons are involved in a single covalent bond?
A) one B) two C) three D) four