/*! 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} Q66 Calculate the isoelectric point ... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 19: Q66 (page 762)

Calculate the isoelectric point for each amino acid.

a. cysteine: pKa (COOH) = 2.05; pKa(伪-NH3+)=10.25

b. methionine: pKa(COOH) = 2.28; pKa(伪-NH3+)=9.21

Short Answer

Expert verified

a. 6.15

b. 5.75

Step by step solution

01

Step 1:Isoelectric point

The isoelectric point (PI) calculates the pH where charges are balanced. The balanced charges may acquire positive or negative charges in a particular medium.

02

Formula to calculate the PI

The formula to calculate the PI is shown as:

PI=pK1+pK2+pK3.........+pKnn

03

Step 3:Explanation

a. Isoelectric point of cysteine is calculated as:

PI=pKaCOOH+pKa伪-NH3+2=2.05+10.252=6.15b.IsoelectricpointofmethionineiscalculatedasPI=pKaCOOH+pKa伪-NH3+2=2.28+9.212=5.75

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

Although p-hydroxybenzoic acid is less acidic than benzoic acid, o-hydroxybenzoic acid is slightly more acidic than benzoic acid. Explain this result.

For each amino acid [RCHNH2COOH], draw its neutral, positively charged, and negatively charged forms. Which form predominates at pH = 1, 6, and 11? What is the structure of each amino acid at its isoelectric point?

a. methionine (R=CH2CH2SCH3)

b. serine (R=CH2CH2OH)

Match the pKavalues to the appropriate compound. pKavalues: 0.28, 1.24, 2.66, 2.86, and 3.12. Compounds: (a) FCH2COOH; (b) CF3COOH; (c) F2CHCOOH; (d) ICH2COOH; (e) BrCH2COOH

Question: Rank the following compounds in order of increasing boiling point.

Question: Rank the labeled protons (Ha-Hb)in mandelic acid, a naturally occurring carboxylic acid in plumsand peaches, in order of increasing acidity. Explain in detail why you chose this order.
See all solutions

Recommended explanations on Chemistry Textbooks

Inorganic Chemistry

Read Explanation

Chemistry Branches

Read Explanation

Physical Chemistry

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Making Measurements

Read Explanation

The Earths Atmosphere

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.