Types of RNA and their function

rRNA ribosomal RNA

Makes up ribosomes along with some proteins

tRNA (transfer RNA)

Brings amino acids to mRNA in the ribosomes

mRNA (messenger RNA)

Copies the code from DNA and takes it to the ribosomes

Suppose you have yeast cells in a laboratory couture. To determine the rate of DNA. Synthesis in the cells, you plan to provide them with a radioactive nucleotide.The rate at which the cells incorporate the nucleotides into the DNA will reveal the rate of DNA synthesis. Which radioactive nucleotides A,T,G,C, or U should you use?

Thymine because DNA has thymine and RNA does not

You are studying the rate of transcription and protein synthesis in plant cells growing in a tissue culture. You will do this by measuring the incorporation of radioactive isotopes into RNA and protein. What could you measure with radioactive phosphorus?

Transcription because proteins do not have phosphorus