Which of the following features distinguishes all hormones from neurotransmitters?  

A.  Hormones require large concentrations to have an effect, while neurotransmitters require only low concentrations.
B.  A hormone affects reproductive functions, while neurotransmitters control all other processes.
C.  Hormones travel via the blood to a target tissue, while neurotransmitters cross the synaptic cleft to a postsynaptic cell.
D.  Hormones are steroids, while neurotransmitters are amino acids.


C.  Hormones travel via the blood to a target tissue, while neurotransmitters cross the synaptic cleft to a postsynaptic cell.

Biology & Microbiology

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The amino acid most commonly modified by phosphorylation is:

A. cysteine. B. tyrosine. C. tryptophan. D. alanine. E. leucine.

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Enveloped viruses include

A) herpes virus. B) adenovirus. C) bacteriophages. D) All of the choices are correct.

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Mendel's law of segregation implies that the two members of an allele pair

a) are assorted dependently. b) must always code for the identical trait or feature. c) are segregated pairwise. d) are distributed to the same gamete. e) are distributed to separate gametes.

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