Deserts are usually found between what latitudes?
a. 0–15 degrees
b. 15–25 degrees
c. 25–40 degrees
d. 40–60 degrees
e. 60–90 degrees
Answer: c
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Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of
event Y occurring is 1 in 5, the probability of both events occurring is ____.
a. (1/4)2 + (1/5)2 = (1/16) + (1/25) = (25/400) + (16/400) = 41/400 b. (1/4) + (1/5) = (5/20) + (4/20) = 9/20 c. (1/4)2(1/5)2 = (1/16)(1/25) = 1/400 d. (1/4)(1/5) = 1/20 e. (1/4 + 1/5)2 = (5/20 + 4/20)2 = (9/20)2 = 81/400
Which of the following poses the best evidence that cell-signaling pathways evolved early in the history of life?
A) Cell-signaling pathways are seen in "primitive" cells such as bacteria and yeast. B) Bacteria and yeast cells signal each other in a process called quorum sensing. C) Signal transduction molecules identified in distantly related organisms are similar. D) Most signals in all types of cells are received by cell surface receptors.
What does alternation of generations mean in a plant life cycle?
A. Large plants have small offspring who grow to have large offspring. B. Mitosis is followed by meiosis in the life cycle. C. Both the haploid and diploid stages include a multicellular component. D. Spores and gametes are both multicellular.
The endosymbiosis hypothesis proposes that
A) two separate cells worked cooperatively and one benefited from the other. B) a small cell lived inside a larger cell to the benefit of both cells. C) a large cell engulfed and digested a smaller cell, exposing its enzymes for use by the larger cell. D) two cells merged into one cell, improving the enzyme function of the new cell.