Transcription is similar to DNA replication in that ___________________
(a) an RNA transcript is synthesized discontinuously and the pieces are then joined together.
(b) it uses the same enzyme as that used to synthesize RNA primers during DNA replication.
(c) the newly synthesized RNA remains paired to the template DNA.
(d) nucleotide polymerization occurs only in the 5?-to-3? direction.
Choice (d) is correct. Choice (a) is incorrect because an RNA transcript is made by a single polymerase molecule that proceeds from the start site to the termination site without falling off. The enzyme used to make primers during DNA synthesis is indeed an RNA polymerase, but it is a special enzyme, primase, and not the enzyme that is used for transcription, which is why choice (b) is incorrect. Choice (c) is false.
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In the experiment above, guppy color patterns (spots) were measured in populations exposed to increasing amounts of predation. From this you could conclude that ____ .
A. evolutionary changes take millions of years to appear
B. predators are less likely to catch and eat brightly colored guppies
C. predators are more likely to catch and eat brightly colored guppies
D. brightly colored guppies are more likely to reproduce in the presence of predators
E. predators do not affect the color patterns of guppies
Coastal waters are highly productive areas
Indicate whether the statement is true or false
Pregnancy is most likely to occur in a woman with a 28-day cycle if sexual intercourse occurs on day ____.
A. 5 B. 10 C. 15 D. 20
Which of the following statements concerning tumor necrosis factors (TNF) is false?
a. TNF can be secreted by macrophages. b. TNF may stimulate the inflammatory response. c. The release of large amounts of TNF brings down a high fever. d. TNF kills cancer cells. e. TNF can be secreted by lymphocytes.