Hershey and Chase tagged the DNA of viruses with radioactive phosphorus, and their protein coats with radioactive sulfur. When the viruses were allowed to infect bacteria, what did the viruses transfer to the bacteria?
A. radioactive phosphorus
B. neither radioactive phosphorus nor sulfur
C. radioactive phosphorus and sulfur
D. radioactive sulfur
Answer: A
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Natural and synthetic angiongenesis inhibitors are being studied with the idea that molecules will increase the growth of tumor
a. true b. false
The determining function that drives share of accepted job offers for a company is given by the following equation: AcceptedOfferst = ?0 + ?1StartingSalaryt + ?2EconomicClimatet + Ut, where the unit of observation is particular month (t). Suppose one wanted to use the national unemployment rate (unemploymentt) as a proxy for EconomicClimate. Which of the following would be a condition that would rule out the unemployment rate being a good proxy for economic climate?
A. ?2 < 0 B. Unemployment rate to be correlated with "other factors" (Ut) C. EconomicClimate is correlated with StartingSalary D. ?2 > 0
Blood flows into the ________ and components of plasma are forced through the walls of this specialized capillary into the nephron.
A. Bowman's capsule B. collecting duct C. loop of Henle D. glomerulus
Traits are critical in the study of phylogeny because:
a. A phylogenetic tree is a hypothesis about evolutionary relationships. b. We need to use observation of traits to infer patterns of ancestry and descent among popula-tions. c. By mapping individual traits onto a phylogeny we have already created, we can study the se-quence and timing of evolutionary events. d. B and C. e. A and C.