C6: Protein Synthesis

Question 1

Question: What determines the sequence of amino acids in a polypeptide?

Answer 1

Answer: The sequence of nucleotides in DNA determines the sequence of amino acids in a polypeptide.

Question 2

Question: What modifications occur to mRNA after transcription in eukaryotic cells?

Answer 2

Answer: After transcription in eukaryotic cells, the first formed mRNA is modified by adding a cap to the 5’ end and a tail made up of many adenine nucleotides to the 3’ end.

Question 3

Question: What happens when there is an excess of tryptophan?

Answer 3

Answer: An excess of tripetofen represses the synthesis of the enzymes coded for the genes of the TRP operon.

Question 4

Question: What does the TRP repressor protein bind to?

Answer 4

Answer: The TRP repressor protein binds only to the operator of the TRP operon, which is bound to the tri-pa-tryptophan. This makes tryptophan a core repressor.

Question 5

Question: What happens during the process of gene expression?

Answer 5

Answer: The DNA of the template strand of the gene is transcribed into mRNA and then translated into protein during the process of gene expression.