26. Nucleic Acids and Protein Synthesis

Determine the number of bases in the information strand for the gene that codes for the peptide below:

           Pro–His–Gly–Gly–Lys–Arg

List possible codon sequences for the following amino acids.

a. Val

Identify the amino acid for which the codon GAG codes, and what other codon could encode for this same amino acid?

What amino acids do the following sequences code for?

a. AUC

Which amino acid(s) have the most codons?

Look at Table 26.3 and find codons for the following amino acids:

a. Val

Insulin is synthesized as preproinsulin, which has 81 amino acids. How many heterocyclic bases must be present in the informational DNA strand to code for preproinsulin (assuming no introns are present)?

What amino acid is coded for by each of the following mRNA codons?

c. CGG

Use three-letter and one-letter abbreviations to write the amino acid sequence for the peptide from each of the following mRNA sequences:

a. ACC ACA ACU

Use three-letter and one-letter abbreviations to write the amino acid sequence for the peptide from each of the following mRNA sequences:

c. UAC GGG AGA UGU

Use three-letter and one-letter abbreviations to write the amino acid sequence for the peptide from each of the following mRNA sequences:

c. AUG CAC AAG GAA GUA CUG

What are the possible codons for each of the following amino acids? (17.5)

a. threonine

What are the possible codons for each of the following amino acids? (17.5)

b. arginine

What is the amino acid for each of the following codons? (17.5)

a. CAA

 Endorphins are polypeptides that reduce pain. What is the amino acid order for the endorphin leucine enkephalin (leu-enkephalin), which has the following mRNA? (17.5)

AUG UAC GGU GGA UUU CUA UAA