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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology