Embryonic cells that have the potential to become any cell type are called:

a. connective cells
b. epithelial cells
c. muscle cells
d. nerve cells
e. stem cells


e

Biology & Microbiology

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Molecules that regulate defense responses via signal transduction pathways are called ____

a. complement proteins b. histamines c. macrophages d. cytokines e. defensins

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Which of the following is NOT involved in

nitrogen fixation? a. breaking triple bonds b. production of ammonia c. production of NO3 ? d. production of NH4 + e. All of these are involved in nitrogen fixation

Biology & Microbiology

The debate over nature vs. nurture in determining certain human characteristics can be explained by pleiotropic genes. Indicate whether the statement is true or false

Biology & Microbiology

Drier climates tend to prevail:a

on the windward side of mountains. b. in a rain shadow. c. close to the coast of the continent. d. in temperate regions. e. only in the northern hemisphere

Biology & Microbiology