Question

question 70
if the coding region of a gene is 1200 nucleotides (excluding the stop codon), how big is the corresponding protein
1200 amino acids
600 amino acids
400 amino acids
2400 amino acids
3600 amino acids
question 71
all proteins begin with the amino acid.
glycine (gly).
valine (val).
leucine (leu).
methionine (met).
proline (pro).

Explanation:

Question 70

In protein synthesis, three nucleotides (a codon) code for one amino acid. Given the number of nucleotides \(n = 1200\), we use the formula \( \text{Number of amino acids}=\frac{n}{3}\).

In the process of translation (protein synthesis), the start codon \(AUG\) codes for the amino acid methionine. So, all proteins (in eukaryotes, in prokaryotes it can be form - methionine but the base - level amino acid is methionine) begin with methionine as the first - coded amino acid (it can be cleaved later in some cases, but initially it is coded).

Answer:

C. 400 amino acids

Question 71