Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain dies and becomes nonlethal. Type R Streptococcus pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The R strain would be transformed into the virulent S strain and kill the host.
B. The R strain would be transformed into the virulent S strain and not affect the host.
C. The S strain would be transformed into the nonvirulent R strain and kill the host.
D. The S strain would be transformed into the nonvirulent R strain and not affect the host.
E. Neither the S nor the R strain would change.
Answer: A
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The selective permeability of a cell membrane is due to ____
a. the hydrophobic core formed by the phospholipid tails b. the hydrophilic surface facing the cell's exterior c. glycolipids on the surface of the membrane
d. the position of cholesterol in the membrane bilayer e. the hydrophilic core formed by the phospholipid tails
After several generations, 35 percent of the island population is found to have AB+ blood. This is much higher than the percentage of AB+ people in the populations from which the original settlers came. The high percentage of AB+ blood is probably due to:
A) founder effect. B) disruptive selection. C) nonrandom mating. D) selective mutation.
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What will be an ideal response?