In the classic experiment that demonstrated the semiconservative nature of DNA replication, cells were grown in 14N and 15N, and DNA was separated by
a. electrophoresis.
b. differential centrifugation.
c. velocity density-gradient centrifugation.
d. equilibrium centrifugation.
Ans: c. velocity density-gradient centrifugation.
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Which is an organic molecule?
a. carbon dioxide (CO2) b. water (H2O) c. methane (CH4) d. hydrochloric acid (HCl) e. oxygen (O2)
In capillaries the blood pressure pushes nutrients out of the capillaries toward the cells.
a. true b. false
An example of assimilation is the
A. synthesis of carbon. B. synthesis of proteins. C. hydrolysis of water. D. hydrolysis of oxygen.
Rosalind Franklin did not share in the Nobel Prize for the discovery of the structure of DNA because _____
a. she was a woman b. her contributions were minimal c. she was not liked by James Watson d. her ideas were stolen by Maurice Wilkins e. she died of cancer before the award was given