Biology, 30.10.2019 07:31 diametriagay
Meselson and stahl cultured e. coli for several generations in a medium with a heavy isotope of nitrogen, 15n. they transferred the bacteria to a medium with a light isotope of nitrogen, 14 n. after two rounds of dna replication, half the dna molecules were light (both strands had 14n) and half were hybrids (15n-14n). what did the researchers conclude from these results?
Answers: 3
Biology, 22.06.2019 09:30, lilyrockstarmag
Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?
Answers: 2
Biology, 22.06.2019 10:00, tuetheturtle
The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a. an ionic bond is formed between the oxygen and carbon atoms. b. four valence electrons are shared. c. two valence electrons are shared. d. valence electrons are shared between oxygen atoms.
Answers: 1
Meselson and stahl cultured e. coli for several generations in a medium with a heavy isotope of nitr...
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