Cell-signaling molecules are generally which type of macromolecule?

A. protein
B. nucleic acid
C. carbohydrate
D. polysaccharide
E. lipid


A

Biology & Microbiology

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Natural selection is limited in its effectiveness in preserving new favorable mutations in an environment that

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An atom with an electrical charge is a(n) ________

A) isotope B) molecule C) ion D) compound

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A population in biology refers to a group of organisms that

A. are different species. B. are genetically related. C. are the same species. D. live in the same space. E. cannot interbreed.

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The Nod factor is an important component of  

A.  the formation of the digestive enzymes of carnivorous plants. B.  legume-bacterial interactions. C.  mycorrhizal-terrestrial plant interactions. D.  the Calvin Cycle. E.  trichloroethylene metabolism.

Biology & Microbiology