Despite the enormous amount of solar energy that plants are exposed to, photosynthesis is only able to transform about 1-2% of that energy into stored chemical energy. Which of the following contributes to this inefficiency?
A. the production of 2-phosphoglycolate
B. the strong preference of rubisco for oxygen
over carbon dioxide
C. the presence of xanthophylls and other
pigments besides chlorophyll in the thylakoid
membrane
D. the presence of two photosystems (I and
II) in the thylakoid membrane that compete
for high energy electrons
A
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________ are microbial infections acquired by hospital patients with noninfectious diseases because they are compromised hosts
A) Healthcare-associated infections B) Immunocompromised infections C) Pathogenic infections D) Virulent infections
Cerebrospinal fluid ____
a. bathes the peripheral nervous system b. is continuous with the lymph system c. is formed from water and solutes that have left capillaries in the brain d. is the solvent that comprises the cytosol of neurons e. is stored in the ventricles
Higher substitution rates are seen in ________ than in ________
A) coding regions, noncoding regions B) 5' flanking regions, 3' flanking regions C) first codon positions, second codon positions D) introns, exons E) charged amino acid codons, noncharged amino acid codons
The risk of developing cancer can be decreased by:
a. increasing the amount of nitrates in the diet. b. exposing questionable tumors to x-rays. c. increasing the amount of unprocessed fruits in the diet. d. examining the breasts and testes every two years. e. exposing neoplasms to UV radiation