The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar.
b. uncharged and nonpolar.
c. basic and polar.
d. positively and negatively charged and nonpolar.
e. uncharged and polar.
B
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Which of the following is a widely supported explanation for the tendency of tropical communities to have greater species diversity than temperate or polar communities?
A) They are less likely to be affected by human disturbance. B) There are fewer parasites to negatively affect the health of tropical communities. C) Tropical communities are low in altitude, whereas temperate and polar communities are high in altitude. D) Tropical communities are generally older than temperate and polar communities. E) More competitive dominant species have evolved in temperate and polar communities.
How can crop yields be increased?
A. All of the answer options are correct. B. converting more land to agricultural fields C. increasing the use of fertilizers to replenish nutrient-depleted soil D. increasing the use of machinery to harvest crops E. using genetically modified crops that are more resistant to disease
The male gametophyte becomes
a. ovules. b. seeds. c. pollen grains. d. cones. e. sperm cells.
The toxic component of lipopolysaccharride is called
A. Lipid A B. NAG C. Lysozyme D. Mucin