State one role of nucleosomes in eukaryotic cells.

Outline how Hershey and Chase’s experiment provided evidence for DNA as the genetic material.

State one function for a region of DNA that does not code for proteins.

Outline the role of the A-site of ribosomes in translation.

Outline the role of tRNA activating enzymes in translation.

a. help to supercoil/pack DNA in chromosomes 

b. help to regulate transcription / gene expression

a. experiment is meant to determine whether DNA or protein is the genetic material 

b. viruses/bacteriophages grown in radioactive S/S³⁵ which enters the protein coat 

c. viruses/bacteriophages grown in radioactive P/P³² which enters the DNA 

d. «radioactive» viral DNA entered the bacterial cell during infection
OR
«radioactive» viral protein did not enter the bacterial cell during infection

regulator of gene expression/introns/telomeres/genes for tRNA / rRNA / promoter / enhancer / silencer / site for primer to bind / codes for mRNA primer

binding/entry of tRNA carrying amino acids/aminoacyl tRNA / charged tRNA / site of transfer of growing polypeptide chains/peptide bond formation

Marks can be awarded to an annotated diagram.

a. ATP «hydrolysis» provides energy for amino acid attachment ✔

b. they attach a specific amino acid to the (3') end / free CCA of a tRNA ✔

c. they do this repeatedly / they attach amino acid to all of the tRNA molecules that have anticodon corresponding to that amino acid