A small group of islanders leave "island A" and travel to "island B." After several generations on island B, a researcher finds that a large percentage of the population is left-handed. Left-handedness is a relatively rare trait on island A. A genetic event that explains this is
A) a population bottleneck.
B) genetic load.
C) a founder effect.
D) natural selection.
C) a founder effect.
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Which of the experiments below would provide the best data set with which to test the hypothesis that female chimpanzees have a greater influence on the vertical transmission of culture than males?
A. Measure the amount of time that young chimps spend with each of their parents, and measure the rate at which they acquire cultural traits. B. Measure the amount of time young chimps spend with their mother only, and measure the rate at which they acquire cultural traits. C. Measure the amount of time young chimps spend with their father only, and measure the rate at which they acquire cultural traits. D. Train a wild chimp to use a new food source, and document how quickly this knowledge spreads to the rest of the population. E. Introduce a new food source to a population and see which chimps learn how to use it first.
It would be necessary to use a tuberculocidal agent to kill a particular species of:
A) Clostridium. B) Mycobacterium. C) Staphylococcus. D) Streptococcus.
Which of these is listed in order from smallest to largest?
a. molecule, macromolecule, atom, cell b. cell, atom, molecule, macromolecule c. atom, molecule, macromolecule, cell d. atom, cell, molecule, macromolecule
Answer the following questions true (T) or false (F)
1. Dendritic cells are the histamine-producing cells of the immune system. 2. Stomach acid is one of our natural defenses against bacteria in food. 3. Cytokines are molecules that cut holes in bacterial membranes.