Question

a. Using the single-letter abbreviations for the amino acids in Table 21.2, write the sequence of amino acids in a tetrapeptide represented by the first four different letters in your first name. Do not use any letter twice. (Because not all letters are assigned to amino acids, you might have to use one or two letters in your last name.)

b. Write one of the sequences of bases in mRNA that would result in the synthesis of that tetrapeptide.

c. Write the sequence of bases in the sense strand of DNA that would result in the formation of that fragment of mRNA.

Short answer

(a)

(b)

(c)

Step-by-step solution

Tetrapeptide

Tetrapeptide is one of the types of the peptide. It consists of four amino acids joined by a peptide bond. It comes under the category of oligopeptide. Many of the tetrapeptides are pharmacologically active that is they show affinity and specificity for a variety of receptors in protein signaling.

Abbreviations for tetrapeptide and sequence of bases in mRNA

(a)

(b)

There are three types of RNA these are messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA). All three types of RNA are involved in protein synthesis.

In the following sequence, the bases in mRNA should be arranged for the synthesis of a tetrapeptide.

mRNA sense strand

Sense strand in DNA

The sense strand is a strand of DNA that has the same sequence as mRNA.mRNA is a messenger RNA which involved in protein synthesis.

The sequence of bases in the sense strand of DNA would result in the formation of that fragment of mRNA is as follows;

DNA sense strand