The two major categories of extracellular signal molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones
b. steroid hormones and neurotransmitters
c. neurotransmitters and vitamins
d. growth hormones and vitamins
e. peptide hormones and neurotransmitters
E
Biology & Microbiology
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Fats, oils, and waxes are called:
a. sugars. b. polysaccharides. c. lipids. d. proteins. e. monomers.
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Which of the following mutualists cannot survive without the mutualistic interaction?
A) facultative B) subordinate C) dependent D) obligate
Biology & Microbiology
Gomphoses
What will be an ideal response?
Biology & Microbiology
A(n) ________ vector is a plasmid that can be replicated in several different organisms because it has at least one origin of replication that will function in each host.
A. expression B. chimeric C. phage D. shuttle
Biology & Microbiology