A regulatory substance binds an enzyme outside of the active site and changes its shape so that it enhances the enzyme's activity. What does this illustrate?
a. allosteric regulation
b. feedback inhibition
c. redox reaction
d. enhancing activation energy
e. an active site, bound by substrate
a
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Substance X is more concentrated in the extracellular fluid than in the intracellular fluid. Substance X will move OUT of the cell by ________.
Fill in the blank(s) with the appropriate word(s).
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.
What would happen to the HS allele if a vaccine for malaria was 100% effective?
The human ?-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. . The HS allele would increase in frequency in populations where malaria was present. B. The HS allele would decrease in frequency in populations where malaria was present. C. There would be no change in frequency between the HS and HA allele. D. Negative frequency-dependent selection would occur and there would be a balanced frequency between the two alleles. E. The frequency of homozygous individuals would decrease and the heterozygous individuals would increase.
Fluid filtered into Bowman's capsule flows directly into the _____
a. renal artery c. distal tubule b. proximal tubule d. loop of Henle