1. In a density-dependent population, an increase in which of the following will most likely lead to an increase in popu

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1. In a density-dependent population, an increase in which of the
following will most likely lead to an
increase in population density?
A. Birthrate
B. Carrying capacity
C. Death rate
D. Emigration
2. A patient who is treated with antibiotics for a bacterial
infection gets a little better but then relapses with this same
infection. What action, done by the bacteria, can account for
this?
A. A bacterium in the population had a mutation that made
it resistant to the antibiotics.
B. A bacterium used transformation to hide from the antibiotics
and the immune system.
C. Some bacteria were able to infect somatic cells, using them
to reproduce their DNA.
D> Some bacteria conjugated with somatic cells to form a new
strain of the streptococcal infection.
3.
The mutation for sickle-cell anemia is a recessive genetic
disease but also causes resistance to malaria when present. Based
on this information, which combination of the following statements
regarding phenomena of genetic variation does this represent?
A. 1 and 2
B. 1, 2, and 3
C. 2 and 3
D. 2, 3, and 4