Amplification of a second-messenger cascade can take place at which level of a signal cascade?
A. One activated G protein can activate numerous effector enzymes.
B. One activated receptor can activate numerous G proteins.
C. One activated protein kinase can allosterically modulate numerous proteins.
D. One active effector enzyme can catalyze numerous reactions.
E. All of the choices are correct.
Answer: E
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Which of the following cranial nerves control movements of the eyeball?
a) optic (II) nerve, oculomotor (III) nerve, and trochlear (IV) nerve b) olfactory (I) nerve, trigeminal (V) nerve, and vagus (X) nerve c) oculomotor (III) nerve, glossopharyngeal (IX) nerve, and trigeminal (V) nerve d) oculomotor (III) nerve, trochlear (IV) nerve, and abducens (VI) nerve e) vagus (X) nerve, accessory (XI) nerve, and hypoglossal (XII) nerve
The phenomenon in which some female coral reef fish spontaneously transform into males if the dominant male is removed is known as
A) Arrhenotoky. B) Protandry. C) Protogyny. D) Thelytoky.
Nociceptors are sensitive to ____
a. sound b. osmolarity c. pain d. light e. scent
A cation is
A. a combination of atoms held together by chemical bonds. B. an alteration in the three-dimensional structure of a protein. C. a negatively charged ion. D. a molecule that conducts electricity when placed in solution. E. a positively charged ion.