Biochemistry: The Molecular Basis of Life
Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 1, Problem 73TQ
Summary Introduction

To review:

The number of possible decapeptides (a molecule with 10 amino acid residues linked by a peptide bond) that can be synthesized from 20 standard amino acids and the time taken by the task to calculate molecular structure of all the decapeptides.

Introduction:

There are hundreds and thousands of naturally occurring amino acids, but there are only 20 standard amino acids that take part in protein synthesis. Amino acids are joined to each other by a peptide bond. The resulting peptide formedby the polymerization of amino acids is called a polypeptide.

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Multisubunit proteins in which some or all of the subunitsare identical are referred to as _______________________.
Question 25 Calculate the net charges of the following peptides at pH 7.4. Indicate which amino acids bear chuarged side chans a) NH2-Asp-Leu-Phe-Ala-Lys-Pro-Glu-Gly-COOH b) NH2-GIn-Glu-Lys-Tyr-Trp-Arg-Ala-Leu-COOH DELL
Question 4. Imagine the main chain of a protein bends back on itself so that two amino acid residues R1 and R2 come close to each other. In the table below are four possibilities for what R1 and R2 might be. In each case, decide whether a specific interaction could form between the residues. If a specific interaction could form, give the name of the interaction. R₁ cysteine tyrosine threonine arginine R₂ cysteine phenylalanine glutamine aspartate specific interaction? OO yes O yes O no no OO O yes no yes no name of specific interaction 0 П 0 0
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