The main type of antibody generated in secondary immune response is
a) IgM
b) IgD
c) IgE
d) IgA
e) IgG
Ans: e) IgG
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The reaction of ethanol fermentation is: pyruvate + NADH ? ethanol + CO2 + NAD+. Why would a yeast need to perform this reaction in the absence of oxygen?
A. To produce CO2 for respiration. B. To produce NAD+ allowing glycolysis to continue. C. NADH is necessary to reduce pyruvate to lactate. D. To produce NAD+ allowing the electron transport chain to run. E. To consume excess pyruvate that cannot enter the Krebs cycle.
Active phytochrome controls
a. flowering and seed set. b. seed germination. c. stem branching and elongation. d. expansion of leaves. e. all of these.
A DUPLICATED CHROMOSOME CONSISTS OF TWO ________
Fill in the blank(s) with the appropriate word(s).
How do males and females differ as they age?
A. Females undergo menopause, but males do not undergo any changes in their reproductive hormone levels. B. Males can continue to produce sperm until death, but females do not continue to produce eggs. C. Females dehydrate faster than males do. D. Males lose skeletal muscle mass, but females tend to gain muscle mass. E. Males develop urinary incontinence, but females do not.