Gas exchange and stomata When water is in short supply, plants _____ their stomata which _____ gas exchange.
a) close, decreases
b) open, decreases
c) close, increases
d) open, increases
Answer: a) close, decreases
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During the Beagle journey, Darwin visited islands, allowing him to compare island species with continental species. In terms of framing his theory of evolution, why was this significant?
A. Because the island species had both similarities to their continental ancestors and unique adaptations to their island environments. B. Because the island species no longer shared traits with their continental ancestors. C. Because the species he saw on the islands had not changed from their ancestral continental form. D. Because the island species had very low reproductive and survival rates as compared with their continental ancestors.
After the completion of cytokinesis, how many daughter cells have been created?
a. 1 b. 2 c. 3 d. 4
Which interval would likely show the higher ratio of double to single chiasmata?
The Q gene locus is 10 map units from the R gene locus which is 40 map units from the S gene locus: Q——10 m.u.——R——40 m.u.——S A) Q-R B) R-S C) The ratios would be the same in the two intervals. D) Two chiasmata never occur in the same interval.
Which of the following is not a membrane-bound organelle?
A) mitochondrion B) cytoskeleton C) nucleus D) endoplasmic reticulum