Steroid and thyroid hormones do not bind to membrane surface receptors because they ____
a. are small enough to pass directly through the membrane
b. are soluble in the lipid bilayer
c. pass through special membrane channels
d. are water-soluble
e. dissolve in the cholesterol present in cell membranes
ANSWER: b
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The number of possible chromosome combinations in a human gamete, considering independent assortment but not crossing over, is about
A) 8. B) 800. C) 80,000. D) 8 million.
The whorl of a flower that consists of all the sepals is the
A. stigma. B. calyx. C. corolla. D. carpel. E. stamen.
Which of the following is incorrect regarding coronaviruses?
A. One type can cause the common cold. B. There is no specific treatment other than supportive care. C. One type can cause SARS. D. They are common animal viruses in pigs, dogs, cats, and poultry. E. There are no tests to confirm diagnosis.
Which ion channel is primarily responsible for the action potential?
A. The voltage-gated potassium channel B. The non-gated sodium channel C. The voltage-gated sodium channel D. The ligand-gated sodium channel E. The ligand-gated potassium channel