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Chapter 18: Problem 52

How many different tripeptides can be made that contain the amino acids alanine, serine, and glycine?

Short Answer

Expert verified
There are 27 different tripeptides that can be made with the amino acids alanine, serine, and glycine.

Step by step solution

01

List the given amino acids

We are given the following amino acids: - Alanine (A) - Serine (S) - Glycine (G)
02

Determine the number of choices for each position

A tripeptide contains three positions in its chain. Since we have three amino acids (A, S, G) to choose from, we have three choices for each position.
03

Calculate the total number of different tripeptides

To find the total number of different tripeptides, we can use the counting principle, which states that if there are n ways to perform the first action, m ways to perform the second action, and so on, then there are n * m * ... ways to perform all actions in sequence. In this case, there are three actions (choosing an amino acid for each position), and there are three ways to perform each action (three amino acids to choose from). Therefore, we have: Total number of different tripeptides = 3 * 3 * 3
04

Calculate the result

Using the calculation from Step 3, we find the total number of different tripeptides: Total number of different tripeptides = 3 * 3 * 3 = \(3^3\) = 27 There are 27 different tripeptides that can be made with the amino acids alanine, serine, and glycine.

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Most popular questions from this chapter

Amino acids are a sort of self-contradiction because they contain both a basic group (the \(\mathrm{NH}_{2}\) end) and an acidic group (the \(\mathrm{CO}_{2} \mathrm{H}\) end \()\) in the same molecule. Therefore, it should not surprise you that, when dissolved in water, an amino acid can react with itself to form what is known as a zwitterion. Based on this information, (a) Draw the structural formula for the form of the amino acid alanine you would expect to find in a neutral water solution. What is the net electrical charge on this species? (b) Enough concentrated \(\mathrm{HCl}\) is added to the solution of part (a) to make it strongly acidic. Draw the structural formula for the form of alanine you expect to find in this solution. What is the net charge on the alanine? (c) Enough concentrated \(\mathrm{NaOH}\) is added to the solution of part (a) to make it strongly basic. Draw the structural formula for the form of alanine you expect to find in this solution. What is the net charge on the alanine now?

What is meant by the term codon? What is the function of a codon?

What is meant by the term macromolecule? Are polymers macromolecules? Explain.

What does the expression essential amino acid mean?

How does DNA serve as the master blueprint for building proteins?
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