What does this figure indicate?
A) Species abundances have dramatically declined.
B) Species richness has dramatically declined.
C) Species have moved higher in elevation over time.
D) Species have moved lower in elevation over time.
C
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Which of the following may characterize monosaccharides?
a. An amino group
b. Carbon and hydrogen 1:2 ratio c. A backbone of eight carbon atoms d. One carbonyl group e. The presence of glycerol and fatty acids
The methanogenic archaeans are ____ that pull electrons from ____
a. chemoautotrophs; oxygen b. chemoheterotrophs; carbon dioxide c. chemoautotrophs; water d. chemoheterotrophs; methane e. chemoautotrophs; hydrogen gas
Which of the following membrane activities requires energy from ATP?
A) facilitated diffusion of chloride ions across the membrane through a chloride channel B) movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid C) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell D) movement of carbon dioxide out of a paramecium
Paland and Lynch showed that sexual populations have fewer deleterious mutations than asexual populations. These results support the hypothesis that
A. asexual reproduction is associated with lower genetic diversity, resulting in the accumulation of highly deleterious mutations. B. sexual reproduction prevents fertilization with gametes carrying alleles with deleterious alleles. C. sexual reproduction produces fewer random mutations than asexual reproduction. D. sexual strains are associated with higher genetic diversity and thus accumulate more beneficial mutations than asexual strains. E. in sexual reproduction, the reassorting of alleles allows for the elimination of more detrimental alleles than in asexual reproduction.