Why are chemotherapeutic agents that work on the peptidoglycan cell wall of bacteria a good choice of drug?
a. Bacteria are especially sensitive to these compounds.
b. The drugs also work against DNA gyrase.
c. They are less expensive that other chemotherapeutic agents.
d. Humans and other animal hosts lack peptidoglycan cell walls.
Answer: d. Humans and other animal hosts lack peptidoglycan cell walls.
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In a mammal that you are studying, blood sodium levels are decreasing sharply. To correct this problem, which hormone might you try to administer?
A. cortisol B. aldosterone C. estrogen D. antidiuretic hormone E. testosterone
Crossing over is __________.
A. the formation of tetrads B. the exchange of corresponding portions of homologous chromosomes C. the movement of genetic material from one chromosome to a nonhomologous chromosome D. an independent assortment of chromosomes
A certain kind of snail can have a right-handed direction of shell coiling (DD or Dd) or left-handed coiling (dd)
However, if direction of coiling is due to a protein deposited by the mother in the egg cytoplasm, then a Dd egg-producing snail and a dd sperm-producing snail will have offspring of which genotype(s) and phenotype(s)? A) 1/2 Dd:1/2 dd; all right-coiling B) all Dd; all right-coiling C) 1/2 Dd:1/2 dd; half right-coiling and half left-coiling D) all Dd; half right-coiling and half left-coiling
The rate of facilitated diffusion of a molecule across a membrane will increase as the concentration gradient of the molecule across the membrane increases to a certain point. Eventually, an increase in the concentration of the molecule will not cause any further increase in facilitated diffusion. Thus, there is a maximal rate of facilitated diffusion. This is because
A) the diffusion constant depends on the concentration gradient. B) the increased concentration gradient causes a situation far from equilibrium. C) there are a limited number of carrier proteins in the membrane. D) as the concentration gradient increases, molecules interfere with one another. E) facilitated diffusion requires ATP energy.