An example of a neurotransmitter that opens ligand-gated sodium channels is:

a. GABA.
b. acetylcholine.
c. ecdysone.
d. NO.
e. cortisol.


B

Biology & Microbiology

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Frameshift mutations include nucleotide substitutions. Indicate whether the statement is true or false

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Which of the following genotypes would not usually be represented in a gamete?

A) AA B) AB C) Ab D) aB E) ab

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Chromatids that are attached at the centromere are called ____ chromatids.

A. mother B. daughter C. sister D. programmed E. either mother or daughter

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The common infection known as "pink eye" is an infection of the

A) sclera. B) cornea. C) iris. D) conjunctiva. E) retina.

Biology & Microbiology