Which of the following is a two-carbon hydrocarbon with a single-carbon carbon bond?
a. ethene
b. ethyne
c. ethane
d. ethylene
c. ethane
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Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because
A. humans synthesize folic acid by a process that is not sensitive to sulfonamides. B. humans do not use folic acid. C. humans do not synthesize folic acid but obtain it in their diets. D. None of these are correct.
The existence of the Oort cloud cannot be confirmed observationally from Earth because the objects are too small and distant
a. True b. False Indicate whether the statement is true or false
Microspores mature into
a. ovules. b. seeds. c. pollen grains. d. megaspores. e. pollen sacs
Which of the following membranes can give rise to a viral envelope?
A) the nuclear membrane B) the cytoplasmic membrane C) the endoplasmic reticulum D) the nuclear and cytoplasmic membranes E) the nuclear and cytoplasmic membranes and the endoplasmic reticulum