Fate maps have been produced for which of the following
a. humans only
b. chickens only
c. Xenopus only
d. chickens, Xenopus, and Drosophila
e. humans, chickens, Xenopus, and Drosophila
D
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Consider the following equations: Equation 1: ATP + H2O ADP + Pi G1 = -?7 kcal/mol Equation 2: phosphoenolpyruvate + H2O pyruvate + Pi G2 = -?14.8 kcal/mol Equation 3: glucose + Pi glucose-6-phosphate + H2O G3 = +3.3 kcal/mol
Equation 4: ADP + Pi ATP + H2O G3 = +7 kcal/mol Which of these equations is most likely to demonstrate energetic coupling in a cell? A. Equations 1 and 2 B. Equations 2 and 3 C. Equations 3 and 4 D. Equations 1 and 4 E. Equations 1 and 3
Which of the following statements describes how antibody-binding brings about the removal of antigens?
A. Antibodies bind to antigens and hasten their removal through the kidneys. B. Antibodies tag antigens for destruction, either via phagocytes or via complement activation. C. Antibodies directly hydrolyze antigens, destroying them. D. Antibodies directly lyse cells expressing foreign antigen, thus removing the antigen.
Vitamin K is produced in the intestine by
a. Escherichia coli. b. Staphylococcus aureus. c. Streptococcus pyogenes. d. Bacillus subtilis. e. Helicobacter pylori.
Entrepreneurs attempted, but failed, to harvest nuts from plantations grown in Southeast Asia. Attempts to grow Brazil nut trees in South American plantations also failed
In both cases, the trees grew vigorously, produced healthy flowers in profusion, but set no fruit. Consequently, what is the likely source of the problem? A) poor sporophyte viability B) failure to produce fertile ovules C) failure to produce pollen D) pollination failure