Humoral immunity is mostly the function of 

A. cytotoxic T cells.
B. MHC I.
C. complement cells.
D. B cells.
E. mast cells.


Answer: D

Biology & Microbiology

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At some of the lowest light concentrations, ________ can still grow well due to their ________, which effectively harvest photons for energy

A) green bacteria / antenna pigments B) green bacteria / chlorosomes C) purple bacteria / antenna pigments D) purple bacteria / chlorosomes

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Which of the following is TRUE of fate mapping?

A. It determines the ultimate structure/function of a particular cell type during embryonic development. B. It maps the genes of an embryo. C. It assesses the quality of a developing embryo. D. It maps the proteins within a morphogenic field. E. It determines hereditable disorders in the embryo.

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Many male birds will expend a great deal of

energy building nests. Females will mate with the males who build the best nests. This is best described as an example of

a. natural selection. b. sexual selection. c. runaway selection. d. the Red Queen effect. e. disruptive selection

Biology & Microbiology

Certain base analogs such as 5-bromouracil cause mutations by chemically altering nitrogenous bases in nonreplicating DNA

Indicate whether the statement is true or false

Biology & Microbiology