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Chapter 16: Q. 16.62 (page 580)

a. Draw the condensed structural formula for Val-Ala-Leu.

b. Would you expect to find this segment at the center or at the surface of a protein? Why?

Short Answer

Expert verified

Part a)

Part b)

  • The R groups on the amino acids of this peptide are non-polar.
  • This section was discovered in the middle of the protein structure.

Step by step solution

01

step-1 Given information (part a)

  • Amino acids have two functional groups: an amine-NH2and a carboxylic acid (-COOH).
  • The a-carbon is covalently linked to both functional groups.
  • All proteins are constructed from amino acids. A dipeptide is formed when two amino acids are linked by an amide bond formed between the amine group of one aminoacid and the carboxylic group of the second aminoacid.
  • Proteins are macromolecules made up of amino acids, which are repeated building blocks that affect the form and function of the protein.
02

step-2 Explanation (part-a)

03

step-3  Given information (part-b)

  • The aliphatic side chains of hydrophobic amino acids make them water insoluble.
  • These hydrophobic amino acids are present inside the protein structure, whereas hydrophilic amino acids have polar side chains and can be found on the surface or outside.
04

step-4 Explanation (part-b)

  • This peptide has non-polar R groups on amino acids. As a result, this section was discovered in the middle of the protein structure.

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Most popular questions from this chapter

Seeds and vegetables are often deficient in one or more essential amino acids. Using the table in problem, state whether each combination provides all of the essential amino acids.

a. rice and lima beans.

b. rice and oatmeal.

c. oatmeal and lima beans.

In myoglobin, about one-half of the 153 amino acids have nonpolar R groups.

a. Where would you expect those amino acids to be located in the tertiary structure?

b. Where would you expect the polarRgroups to be in the tertiary structure?

c. Why is myoglobin more soluble in water than silk or wool?

Methanol and ethanol are oxidized by alcohol dehydrogenase. In methanol poisoning, ethanol is given intravenously to prevent the formation of formaldehyde that has toxic effects.

a. Draw the condensed structural formulas for methanol and ethanol.

b. Would ethanol compete for the active site or bind to a different site?

c. Would ethanol be a competitive or noncompetitive inhibitor of alcohol dehydrogenase?

A portion of a polypeptide chain contains the following sequence of amino acids:

- Leu-Val-Cys-Asp-

a. Which amino acids are likely to be found on the inside of the protein structure? Why?

b. Which amino acids would be found on the outside of the protein? Why?

c. How does the primary structure of a protein affect its tertiary structure?

Consider the amino acids lysine, valine, and aspartate in an enzyme. State which of these amino acids have Rgroups that would:

a. be found in hydrophobic regions.

b. be found in hydrophilic regions.

c. form hydrogen bonds.

d. form salt bridges.
See all solutions

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