All of the individuals of the same species that inhabit the same place at the same time are known as:
a. a gene pool.
b. an ecosystem.
c. a community.
d. a population.
e. a genome.
D
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Rickettsias enter host cells by inducing ________.
Fill in the blank(s) with the appropriate word(s).
Often connected to a petiole, these plant organs may be either simple or compound and are typically
the main organs of photosynthesis and gas exchange.
a. roots b. leaves c. flowers d. stems e. trichomes
Genetic counselors are typically medical doctors who specialize in treating infertile couples
a. True b. False
Answer the following questions true (T) or false (F)
1. T cell subclass differentiation allows T cell clones to recognize different epitopes of the same antigen. 2. Both the light and the heavy chains of an antibody are involved with epitope recognition and binding. 3. The humoral immune response can enhance phagocytosis by either direct interaction of antibodies with their antigen, or though antibody activation of the complement cascade.