A large group of molecules involved in signaling and regulation of defense responses are:a

complement.
b. prostaglandins.
c. opsonins.
d. cytokines.
e. histamines


D

Biology & Microbiology

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The plant cell organelle analogous to the endosome is the

A) provacuole. B) lysosome. C) peroxisome. D) glycoxysome. E) none of the above

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What theory explains the ability of the electron transport system to pump protons between the inner and outer mitochondrial membranes?

What will be an ideal response?

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Which event is the most direct (or first) result of natural selection on a population?

A) New alleles are created when confronted with a new environment. B) Proteins lose some functions. C) The frequency of some alleles changes in the population. D) Members of the population start reproducing more rapidly.

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Which of the following statements best describes a compound?

A) A compound is a pure element. B) A compound contains two or more different elements in a fixed ratio. C) A compound is exemplified by sodium. D) A compound is a solution.

Biology & Microbiology