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
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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
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?
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.
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.