If both parents are "carriers" due to the presence of one copy of the Tay-Sachs allele, what are the odds that they would have a normal child?
a. 0
b. 25%
c. 50%
d. 75%
e. 100%
d
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Companion cells load most of the carbohydrates into sieve tube members ____
a. through plasmodesmata b. by osmosis c. by antiport
d. through carrier proteins e. by symport
Thomas Bell and his colleagues showed that ______
a. island size affects beech tree populations b. beech trees are islands for bacteria c. number of bacteria species increases with tree hole volume d. large beech trees support higher bacteria populations than small beech trees e. salt marsh bacteria can live on large beech trees
When riding a horse, a jockey squeezes his thighs together to stay on the saddle. This is an example of ____
a. flexion b. extension c. abduction d. adduction e. pronation
The plant cell organelle most analogous to animal cell lysosomes is the
A) vacuole. B) glyoxysome. C) microsome. D) endosome. E) leaf peroxisome.