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Chapter 4: Q6P (page 95)

Calculate the number of possible pentapeptides that contain one residue each ofAla, Gly, His, Lys, and Val.

Short Answer

Expert verified

The number of possible pentapeptides that contain one residue each of Ala, Gly, His, Lys, andVal is 120.

Step by step solution

01

Concept Introduction

Pentapeptide repeats are a type of sequence pattern present in protein molecules in multiple tandem copies.Pentapeptide repeat proteins are found in all organisms, but cyanobacterial genomes have more copies.

02

The number of Pentapeptides

The first residue can be one of the five residues then the second residue can be one of the four, the third residue can be one of the remaining three, the second can be one of the remaining two, and the fifth one is the last residue.

The solution is obtained as N = 5! = 120.

Therefore, the number is obtained as 120 .

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Most popular questions from this chapter

Describe how each of the amino acid modifications shown in Fig. 4-14 would affect theof a peptide containing that modified amino acid residue.

Why do the pKavalues of ionizable groups differ between free amino acids and amino acid residues in polypeptides?

(a) What is the net charge at neutral pH of a tripeptide containing only alanine? (b) How does the total number of negative and positive charges change following hydrolysis of the tripeptide?

Identify the amino acid residue from which the following groups are synthesized:

Identify all the chiral carbons in the amino acids shown in Table 4-1.

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