Which type of interaction stabilizes the ?-helix and the ?-pleated sheet structures of proteins?
A) hydrophobic interactions
B) disulfide bonds
C) ionic bonds
D) hydrogen bonds
E) peptide bonds
Answer: D
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Paland and Lynch showed that sexual populations possessed fewer deleterious mutations than asexual populations. These results supported the hypothesis that
A. sexual reproduction prevents fertilization with gametes carrying alleles with deleterious alleles. B. sexual reproduction produces fewer random mutations than asexual reproduction. C. asexual reproduction is associated with lower genetic diversity, resulting in the accumulation of highly deleterious mutations. D. in sexual reproduction, the reassorting of alleles allows for the elimination of more detrimental alleles than in asexual reproduction. E. sexual strains are associated with higher genetic diversity and thus accumulate more beneficial mutations than asexual strains.
Based on fossil evidence, which of the following existed the longest ago?
a. Homo habilis b. Homo erectus c. Australopithecus africanus d. Australopithecus afarensis e. Homo neanderthalensis
When Mendel crossed tall (Tt) plants with tall plants of the same genotype, the offspring
A. were always short. B. were a variable mix of tall and short. C. were an equal mix of short and tall. D. were always tall. E. did not grow and reproduce, because they were separate species.
How many net ATP are produced during alcoholic fermentation?
a. 2 b. 4 c. 6 d.8