Pulse-chase experiments provided evidence that:
A)RNA is made of ribose sugars rather than deoxyribose.
B)RNA is an information-transfer intermediary between DNA and protein.
C)many viruses have RNA genomes.
D)RNA is capable of catalyzing biological reactions.
E)RNA is synthesized in short pulses of transcriptional activity.

Question

Quizplus · Accepted Answer

Pulse-chase experiments involve labeling molecules in a cell and then tracking their movement over time. In this case, radioactively labeled amino acids were used to label newly synthesized proteins in a cell. By "chasing" the labeled proteins over time, researchers could see that they were first synthesized as mRNA molecules, which were then used as templates to build proteins. This provided evidence that RNA serves as an intermediary between DNA (which contains the genetic information) and protein (which carries out many cellular functions).

Pulse-Chase Experiments Provided Evidence That