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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

What functional groups are found in all a-amino acids?

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.

Fresh pineapple contains the enzyme bromelain that hydrolyzes peptide bonds in proteins.

a. The directions for a gelatin (protein) dessert say not to add fresh pineapple. However, canned pineapple where pineapple is heated to high temperatures can be added. Why?

b. Fresh pineapple is used in a marinade to tenderize tough meat. Why?

c. What structural level of a protein does the bromelain enzyme destroy?

Classify each of the following proteins according to its function:

a. hemoglobin, oxygen campier in the blood

b. collagen, a major component of tendons and cartilage

c. Keratin is a protein that is found in hair.

d. amylases that catalyze the hydrolysis of search

In anαhelix, how does hydrogen bonding occur between the amino acids in the polypeptide chain?
See all solutions

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