Members of two different species are never capable of mating.

a. true
b. false


Answer: b. false

Biology & Microbiology

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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.

Biology & Microbiology

Which of the following is not a class of plant secondary compounds?

A) terpenoids B) phenolics C) nitrogen-based compounds D) alkanes

Biology & Microbiology

Which neurotransmitter opens ligand-gated sodium channels?

a. GABA b. cortisol c. ecdysone d. acetylcholine e. brassinosteroid

Biology & Microbiology

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

Biology & Microbiology