Meselson and Stahl determined that DNA replication in E. coli is semiconservative. What additive did they initially supply to the medium in order to distinguish "new" from "old" DNA?
What will be an ideal response?
15N
You might also like to view...
The TCA cycle and glyoxylate cycle are similar in many respects. Which of the following statements accurately describes these cycles?
A) Both cycles are catabolic in function. B) The glyoxylate cycle has only a single decarboxylating reaction. C) In the glyoxylate cycle, two acetyl CoA molecules are used to generate succinate. D) The glyoxylate cycle is used by some organisms to synthesize proteins. E) The TCA and glyoxylate cycles both occur in the mitochondrion
The upper limit of an organism's distribution in the rocky intertidal is usually determined by:
a. grazing effect. b. predation. c. pH. d. desiccation. e. competition.
Kidney stones____
a. are four times more likely to occur in men than women b. usually cause extreme pain c. cause no pain when they enter the ureter d. are formed when proteins that are dissolved in the urine concentrate e. never block the flow of urine
Which of the following it true in regards to fungi?
A. They are heterotrophs B. They are more closely related to plants C. They contain chitin in their cell wall D. They obtain nutrients via ingestion. E. Answers A and C F. Answers A and D G. Answers A, C, and D