Any substance that triggers an immune response in the body is called a(n) ________
A) memory cell B) MHC marker C) complement D) antigen
Answer: D
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In crosses involving linked genes, recombinant offspring result from:
A. Mendelian segregation. B. independent assortment of alleles. C. sex-linked inheritance. D. crossover. E. Mendelian segregation and independent assortment of alleles.
Because most natural populations are actually metapopulations, we can only understand their dynamics if, in addition to the births and deaths of individuals, we also understand:
A. the extinction of local populations. B. the colonization of local populations. C. r and K selection. D. the extinction and colonization of local populations. E. the extinction and colonization of local populations as well as r and K selection.
In the case of infants and small children, how much blood is usually drawn for bacterial culture?
a. 0.5 mL b. 1 mL c. 1 to 5 mL d. No more than 10 mL
In a certain species of salmon, some adult males are extremely large whereas other adult males are very small, compared to the females. There are no intermediate-sized adult males in the population. This is probably the result of
A) directional selection. B) artificial selection. C) disruptive selection. D) stabilizing selection.