T3 and T4 thyroid hormones are produced by:
A) parafollicular cells
B) parathyroid cells
C) follicular cells
D) hypothalamus
Answer: C) follicular cells
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The neurotransmitter involved in the process of contraction in skeletal muscles is
A) synovial fluid. B) ATP. C) troponin. D) acetylcholine. E) None of the answers are correct.
Olfactory receptors are very special because they
A) lack structural differences. B) can distinguish at least fifty primary smells. C) can distinguish from among thousands of chemical stimuli. D) contains receptor populations with different sensitivities. E) are a rare example of neuronal replacement.
Does temperature-dependent sex determination offer any benefits to turtles, or is it better regarded as a possibly ancestral system of sex determination that has persisted in most lineages of turtles because it works well enough?
What will be an ideal response?
A membrane transport process is active if it requires ________
A) a concentration gradient B) energy provided by ATP C) kinetic energy of molecules D) a pressure difference