Which of the following statements concerning osmosis is FALSE?
A) Osmosis requires a selectively permeable membrane.
B) During osmosis, water crosses to the side of the membrane with a lower solute concentration.
C) Cells placed in hypotonic solutions will gain water.
D) Crenation results when blood cells are placed in a hypertonic solution.
E) Osmosis stops when the system reaches equilibrium.
B
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The human b-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. If a vaccine for malaria was created that was 100% effective, affordable, and widely available, what would happen to the frequency of the HS allele?
A. The HS allele would increase in regions where malaria is prevalent and decrease in regions where malaria is absent or rare. B. The HS allele would decrease in regions where malaria is prevalent and increase in regions where malaria is absent or rare. C. Due to balancing selection, the frequency of the HS allele would remain stable in all regions. D. The HS allele would increase in regions where malaria is prevalent and remain stable in regions where malaria is absent or rare. E. The HS allele would decrease in regions where malaria is prevalent and remain stable in regions where malaria is absent or rare.
At night, assuming no artificial lights, primarily
a. Pr absorbs red light and is converted to Pfr. b. Pr absorbs far-red light and is converted to Pfr. c. Pfr absorbs red light and is converted to Pr. d. Pfr absorbs far-red light and is converted to Pr. e. Pfr is converted to Pr.
Scientists studying a group of related bird species on an island archipelago discover that these species are always more closely related to each other within an island than they are between any two islands. The most likely explanation for this result is that
A. many ancestral bird species colonized each island. B. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations. C. each bird species evolved different adaptations in allopatry and then colonized the other islands. D. one bird species colonized each island and then evolved into distinct species on that island through character displacement.
Changes in the DNA are called ________
Fill in the blank(s) with correct word