The decline of the eugenics movement in the U.S. in the early 20th century resulted from ____
a. breakthroughs in genetic technology
b. violent protests by the medical community
c. the ability to manipulate gene expression
d. social outrage at the number of deaths caused by botched sterilizations
e. its misuse for social and political purposes by the Nazis
ANSWER: e
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The results of an experiment on genetic drift on Drosophila melanogaster are illustrated in the accompanying figure. These data show ________
A) the loss of heterozygosity in the population over time B) the fixation of alleles in the population over time C) the permanent loss of alleles from the population over time D) All of the above are accurate. E) None of the above is accurate.
The function of carbonic anhydrase is to increase the rate ____
a. of conversion of CO2 and H2O into HCO3? and H+ b. of conversion of HCO3? and H+ into CO2 and H2O c. at which CO2 binds to hemoglobin d. at which O2 binds to hemoglobin e. of conversion of HCO3? and H+ into CO2 and H2O, and the rate at which CO2 binds to hemoglobin
How does diffusion limit size in cells?
a. Once a cell attains a particular size, the transport proteins in the cell membrane stop functioning and diffusion fails. b. The size of the cell dictates the size of lipids in the membrane. If the lipids become too large, diffusion becomes slower and the cells can starve. c. As cells increase in size, the surface-to-volume ratio decreases and diffusion becomes too inefficient to provide nutrients and waste disposal from the cell. d. Cells that are of a particular size, or greater, enter a state of torpor and growth slows until the cell shrinks again.
If a plant cell is stripped of its cell wall it forms a protoplast. A protoplast would
A. be connected to adjacent protoplasts by a middle lamella. B. be surrounded by cellulose. C. be less rigid than a plant cell. D. be stronger than a plant cell.