a. The current estimate for the number of protein coding genes in human genome is about 20,000. If the average protein is about 550 amino acids long, and it requires 3 base pairs to encode each amino acid, how many base pairs would be required to encode all human proteins?

b. The human genome is approximately 3.1 x 10^9 bp. Based on your answer to part a, what proportion of the human genome actually codes for protein?