Once a pollen tube lands on a compatible stigma ____
a. chemical cues guide the pollen tube from the stigma to the embryo sac of an ovule
b. that pollen tube continues on to another ovule
c. other pollen tubes are attracted to that ovule
d. other pollen tubes can penetrate that ovule more easily
e. the flower dies to prevent further pollination
ANSWER: a
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According to the modern synthesis, macroevolution results from ____
a. abrupt changes in a species environment b. the chance appearance of “hopeful monsters” c. changes in genes that occur in spurts d. abrupt changes in an individual’s genetic make-up e. the gradual accumulation of microevolutionary changes
Modern nonvascular plants are generally small because they lack leaves
a. True b. False
How many NADH molecules are generated in
the breakdown of one molecule of glucose in aerobic respiration?
a. 5 b. 10 c. 15 d. 20 e. 25
The above figure represents which of the following
chromosomal changes:a. inversion b. deletion c. duplication d. translocation e. aneuploidy