/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q13P a. What percentage of the 伪-ami... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 21: Q13P (page 996)

a. What percentage of the 伪-amino group of lysine will be protonated at its pI?<25%50% >75%

b. Answer the same question for the蔚-amino group of lysine.

Short Answer

Expert verified
  1. >75%
  2. >75%

Step by step solution

01

Step-by-Step SolutionStep 1:Structure of Lysine

The structure of Lysine is shown below:

Structure of Lysine

02

Step 2:α-amino and ε-amino group of lysine

Lysine is an amino acid with 3 ionisable side groups which are 伪-COOH, 伪-amino and 蔚-amino.There pKa values are 2.2, 9.2, 10.8, respectively. Thus, isoelectric point can be calculated as:

pI=9.2+10.82=10

Thus, percentage of the伪amino group of lysine will be protonated and its pI will be,

9.210脳100= 92%

And, percentage of蔚amino group of lysine will be more than 75%.

Hence,more than 75% of 伪-amino group and蔚-amino group will be protonated at its pI.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Write the mechanism for the reaction of a cysteine side chain with iodoacetic acid.

Esterase is an enzyme that catalyzes the hydrolysis of esters. It hydrolyzes esters of L-amino acids more rapidly than esters of D-amino acids. How can this enzyme be used to separate a racemic mixture of amino acids?

Why are the carboxylic acid groups of the amino acids more acidic

(pKa ~ 2) than a carboxylic acid such as acetic acid (pKa = 4.76)?

Draw the product obtained when a lysine side chain in a polypeptide reacts with maleic anhydride.

What amino acid is formed when the aldehyde used in the Strecker synthesis is

a. acetaldehyde? b. 2-methylbutanal? c. 3-methylbutanal?
See all solutions

Recommended explanations on Chemistry Textbooks

Nuclear Chemistry

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Organic Chemistry

Read Explanation

Kinetics

Read Explanation

Chemistry Branches

Read Explanation

Inorganic Chemistry

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.