Members of two different species are never capable of mating.
a. true
b. false
Answer: b. false
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Defects in cell signaling can lead to a cancerous cell due to:
A. overproduction of signals that trigger cell division. B. overproduction of a receptor that triggers cell division. C. a defective receptor that stays in the activated state and triggers cell division continuously. D. a defective signal-transduction protein that stays in the activated state and triggers cell division continuously. E. All of these choices are correct.
In a muscle contraction, which element is fixed
in place?
a. the muscle fiber b. the myofilament c. the sarcomere d. the actin filament e. the myosin filament
Which of the following is not a class of plant secondary compounds?
A) terpenoids B) phenolics C) nitrogen-based compounds D) alkanes
Which neurotransmitter opens ligand-gated sodium channels?
a. GABA b. cortisol c. ecdysone d. acetylcholine e. brassinosteroid