The olfactory receptors discovered by Richard Axel and Linda Buck are members of a large family of similar receptor molecules termed
A. intracellular receptors.
B. ligand-gated ion channels.
C. voltage-gated ion channels.
D. G-protein coupled receptors.
E. serine/threonine proteases.
Answer: D
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The nictitating membrane of sharks is used to:
a. protect the gills. b. line the mouth. c. enclose the internal organs. d. detect smells. e. cover the eye.
GENETIC DRIFT IS THE RESULT OF _____
Fill in the blank(s) with the appropriate word(s).
Miller's experiment showed that life could arise via chemical evolution.
Answer the following statement true (T) or false (F)
An individual who is at risk of passing a genetic defect onto his or her offspring would most likely undergo ____
a. genetic testing b. genetic screening c. enzyme replacement therapy d. preimplantation genetic diagnosis (PGD) e. amniocentesis