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Chapter 5: Q5-1P (page 127)

It has been hypothesized that early life-forms used only eight different amino acids to build small peptides. How many different 10-residue peptides could be constructed from eight amino acids?

Short Answer

Expert verified

810 Possibilities can be constructed from eight amino acids.

Step by step solution

01

Definition of amino acids

Amino acids are the building blocks of proteins. The building blocks of life are amino acids and proteins.

02

Peptides that could be constructed from eight amino acids

810 different 10-residue peptides could be constructed from eight amino acids. Which means that eight amino acids can be used to create eight separate 10-residue peptides.

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Most popular questions from this chapter

What fractionation procedure could be used to purify protein 1 from a mixture of three proteins whose amino acid compositions are as follows?

1. 25% Ala, 20% Gly, 20% Ser, 10% Ile, 10% Val, 5% Asn, 5% Gln, 5% Pro

2. 30% Gln, 25% Glu, 20% Lys, 15% Ser, 10% Cys

3. 25% Asn, 20% Gly, 20% Asp, 20% Ser, 10% Lys, 5% Tyr

All three proteins are similar in size and pI, and there is no antibody available for protein 1.

Explain how an antibody could be useful for purifying a protein and for determining its concentration.

Identify the first residue obtained by Edman degradation of cytochrome c from (a) Drosophila, (b) baker’s yeast, and (c) wheat germ (see Table 5-6).

Electrospray ionization mass spectrometry (ESI-MS) of proteins involves creating positively charged ions of the protein and separating them according to their mass-to-charge ratio (m/z).

(a) What causes the different positive charges on different particles of the protein?

(b) The amino acid composition (in numbers of residues per chain) of hen egg-white lysozyme (HEWL) is as follows:

P 2 Y 3 N 14 H 1

D 7 M 2 L 8 E 2

C 8 R 11 G 12 F 3

A 12 I 6 K 6 V 6

S 10 W 6 T 7 Q 3

What is the maximum positive charge that can be present on a HEWL ion?

Protein X has an absorptivity of 0.4mL · mg-1· cm-1 at 280nm. What is the absorbance at 280nm of a 2.0 mg · mL-1solution of protein X? (Assume the light path is 1cm.)
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