The classic Hershey and Chase (1952) experiment that offered evidence in support of DNA being the genetic material in bacteriophages made use of which of the following labeled component(s)?
A. phosphorus and sulfur
B. nitrogen and oxygen
C. tritium
D. hydrogen
E. None of the answers listed is correct.

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Types of scientific inquiry that biologist engage in that cannot be completely controlled

I’m stuck on this question cuz i’m stupid sksksksk