Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 23: Problem 25

(a) How many tripeptides can be made from glycine, alanine, and leucine, using each amino acid only once per tripeptide? (b) Write the structural formulas of these tripeptides and name them in the shorthand abbreviation used for showing amino acid sequences.

Short Answer

Expert verified
Provide the shorthand abbreviations and structural formulas of these tripeptides. Answer: There are 6 possible tripeptides that can be formed using glycine, alanine, and leucine. The shorthand abbreviations are: 1. Glycine-Alanine-Leucine (GAL) 2. Glycine-Leucine-Alanine (GLA) 3. Alanine-Glycine-Leucine (AGL) 4. Alanine-Leucine-Glycine (ALG) 5. Leucine-Glycine-Alanine (LGA) 6. Leucine-Alanine-Glycine (LAG) You may draw the structural formulas yourself by connecting the amino acids in the specified order.

Step by step solution

01

Determine the number of possible tripeptides

To determine the number of possible tripeptides, we will use the permutation formula, which is defined as n!/(n-r)!, where n is the number of items to choose from (in this case, the number of amino acids), and r is the number of items being chosen (in this case, 3 since we are finding tripeptides). In our problem, n = 3 and r = 3, so the formula becomes: P(3,3) = 3!/(3-3)! P(3,3) = 3!/0! Since 0! is equal to 1, this simplifies to: P(3,3) = 3! Calculating 3! (3 factorial) means multiplying 3 by every positive integer below it: P(3,3) = 3 * 2 * 1 = 6 There are 6 possible tripeptides that can be formed using glycine, alanine, and leucine.
02

List the possible tripeptides

To list the possible tripeptides, we will combine the three amino acid components in every possible distinct order: 1. Glycine-Alanine-Leucine 2. Glycine-Leucine-Alanine 3. Alanine-Glycine-Leucine 4. Alanine-Leucine-Glycine 5. Leucine-Glycine-Alanine 6. Leucine-Alanine-Glycine These are the 6 possible tripeptides that can be formed from glycine, alanine, and leucine.
03

Write the shorthand abbreviations

Now, we'll write the shorthand abbreviations for each tripeptide using the standard single-letter abbreviations for each amino acid: 1. Glycine-Alanine-Leucine: GAL 2. Glycine-Leucine-Alanine: GLA 3. Alanine-Glycine-Leucine: AGL 4. Alanine-Leucine-Glycine: ALG 5. Leucine-Glycine-Alanine: LGA 6. Leucine-Alanine-Glycine: LAG
04

Conclusion

In conclusion, there are 6 possible tripeptides that can be formed using glycine, alanine, and leucine, each used only once per tripeptide. These tripeptides are: 1. Glycine-Alanine-Leucine (GAL) 2. Glycine-Leucine-Alanine (GLA) 3. Alanine-Glycine-Leucine (AGL) 4. Alanine-Leucine-Glycine (ALG) 5. Leucine-Glycine-Alanine (LGA) 6. Leucine-Alanine-Glycine (LAG) Structural formulas for these tripeptides can be drawn by connecting the amino acids in the specified order.

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.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

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

On complete hydrolysis, a polypeptide gives two alanine, one leucine, one methionine, one phenylalanine, and one valine residue. Partial hydrolysis gives the following fragments: Ala-Phe, Leu-Met, Val-Ala, Phe-Leu. It is known that the first amino acid in the sequence is valine and the last one is methionine. What is the complete sequence of amino acids?

A \(1.00\) -mg sample of a pare protein yielded on hydrolysis \(0.0165 \mathrm{mg}\) of leucine and \(0.0248 \mathrm{mg}\) of isoleucine. What is the minimum possible molar mass of the protein? (MM leucine \(=\) MM isoleucine \(=131 \mathrm{~g} / \mathrm{mol}\) )

Starch has the same empirical formula as cellulose and a molar mass of about \(1.0 \times 10^{5} \mathrm{~g} / \mathrm{mol}\). (a) What are the mass percents of \(\mathrm{C}, \mathrm{H}\), and \(\mathrm{O}\) in starch? (b) How many \(\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}_{5}\) units are linked together in a starch molecule?

Explain the difference between (a) a synthetic and natural polymer. (b) a polyester and polyamide. (c) \(\alpha\) -and \(\beta\) -glucose.

How many tripeptides could one make from glycine, valine, and lysine, using any number of each amino acid?
See all solutions

Recommended explanations on Chemistry Textbooks

Chemical Reactions

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Physical Chemistry

Read Explanation

Kinetics

Read Explanation

Making Measurements

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.

Sign-up for free