Fibers extending from cell pole to cell pole are called the
A. cleavage furrow.
B. cell plate.
C. cell equator.
D. spindle.
D. spindle.
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Which of the following is a difference between RNA and DNA?
A) RNA is single-stranded and DNA is usually triple-stranded. B) DNA contains adenine and RNA does not. C) RNA has ribose sugar and DNA has deoxyribose sugar. D) RNA is made from nucleotide monomers and DNA is made from amino acid monomers.
In the graph depicted below, curve A is the _____ and curve B is the _____
a) logistic growth curve; exponential growth curve b) logistic growth curve; maximum sustainable yield c) exponential growth curve; logistic growth curve d) logistic growth curve; carrying capacity e) carrying capacity; logistic growth curve
Among important crop plants, nitrogen-fixing root nodules are most commonly an attribute of
a) wheat. b) cabbage and other members of the brassica family. c) legumes. d) corn. e) members of the potato family.
The neurotransmitter acetylcholine ____.
A. speeds heart rate B. induces skeletal muscle contraction C. increases anxiety D. has a role in memory and learning E. dilates pupils