`N' CH3 H a. Provide the sequence for the peptide using the 3-letter abbreviations. b. Which amino acid is the N-terminus? Which amino acid is the C-terminus? c. Circle the side chains and classify them as non-polar, polar, acidic, or basic. d. Name at least three amino acids whose side chains have the characteristic of being able to repel water. e. Look at the following disulfide bridge. Cleavage of the disulfide bridge will occur via a reduction reaction; sketch the products at physiological pH. Circle and identify any functional groups in each product. H;C

Organic And Biological Chemistry
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Author:STOKER, H. Stephen (howard Stephen)
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Chapter9: Proteins
Section: Chapter Questions
Problem 9.58EP
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4.Look carefully at the following polypeptide chain and use its structure to answer the
following questions.(1+1+1+1+2)
S.
+
H3N.
`N'
ČH3 H
a. Provide the sequence for the peptide using the 3-letter abbreviations.
b. Which amino acid is the N-terminus? Which amino acid is the C-terminus?
c. Circle the side chains and classify them as non-polar, polar, acidic, or basic.
d. Name at least three amino acids whose side chains have the characteristic of being
able to repel water.
e. Look at the following disulfide bridge. Cleavage of the disulfide bridge will occur
via a reduction reaction; sketch the products at physiological pH. Circle and identify
any functional groups in each product.
H;C
OH
NH2
5.a. What is the biochemical test for a reducing sugar (all monosaccharides and disaccharides
EXCEPT sucrose) and what result will indicated a positive test?
b. Name the disaccharide formed when you join the following monosaccharides in a
condensation reaction. 1. Glucose and glucose 2. Glucose and fructose 3. Glucose and galactose.
03
c. Differentiate between glycogen and starch.
01
Transcribed Image Text:4.Look carefully at the following polypeptide chain and use its structure to answer the following questions.(1+1+1+1+2) S. + H3N. `N' ČH3 H a. Provide the sequence for the peptide using the 3-letter abbreviations. b. Which amino acid is the N-terminus? Which amino acid is the C-terminus? c. Circle the side chains and classify them as non-polar, polar, acidic, or basic. d. Name at least three amino acids whose side chains have the characteristic of being able to repel water. e. Look at the following disulfide bridge. Cleavage of the disulfide bridge will occur via a reduction reaction; sketch the products at physiological pH. Circle and identify any functional groups in each product. H;C OH NH2 5.a. What is the biochemical test for a reducing sugar (all monosaccharides and disaccharides EXCEPT sucrose) and what result will indicated a positive test? b. Name the disaccharide formed when you join the following monosaccharides in a condensation reaction. 1. Glucose and glucose 2. Glucose and fructose 3. Glucose and galactose. 03 c. Differentiate between glycogen and starch. 01
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