What is an average concentration of prokaryotic cells along the surface of pelagic water?
A) 104 cells/ml
B) 106 cells/ml
C) 108 cells/ml
D) 1010 cells/ml
Answer: B
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Allof the following evidence supports the RNA world hypothesisexcept:
A. RNA can function as a genome. B. An RNA component of ribosomes catalyzes the synthesis of proteins. C. RNA can serve a structural role. D. RNA stabilizes membranes. E. RNA regulates gene expression.
Which of the following normally leads to the production of functional messenger RNA in eukaryotic cells?
(A) A decrease in the rate of ribosome synthesis (B) The removal of portions of RNA known as intervening sequences (introns) (C) A decrease in RNA polymerase activity (D) The replication of new messenger RNA molecules from existing messenger RNA molecules
In a mature stem, bark includes
A. cork, cork cambium, and phloem B. sapwood and heartwood C. cork cambium and vascular cambium D. nonfuctional phloem only
The government runs an experiment where a random sample of 200 adults over 40 get a 5% tax cut and a random sample of 200 adults under 40 get no tax cut. Their results show that spending, on average, increased 8% with a 5% tax cut. They conclude that a 5% tax cut for all adult Americans will increase spending by 8%. Why is this logic flawed?
A. The measured effect of the treatment on the treated may be biased. B. A 5% tax cut for all Americans suffers from selection bias. C. The effect of the treatment on the treated may not be the average treatment effect. D. The logic is not flawed.