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Ch.18 Amino Acids and Proteins
McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMcMurry 8th EditionCh.18 Amino Acids and ProteinsProblema 19
Capitolo 18, Problema 19

There are eight amino acids in vasopressin. How many peptide bonds are in this small protein?

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1
Understand the structure of a peptide bond: A peptide bond is a covalent bond formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of another amino acid during a condensation reaction, releasing a molecule of water (H2O).
Recognize that peptide bonds link amino acids together in a chain to form proteins or peptides. The number of peptide bonds in a protein is always one less than the number of amino acids in the chain.
Identify the number of amino acids in vasopressin, which is given as eight.
Subtract one from the total number of amino acids to determine the number of peptide bonds. This is because the first amino acid in the chain does not form a peptide bond at its amino terminus, and the last amino acid does not form a peptide bond at its carboxyl terminus.
Conclude that the number of peptide bonds in vasopressin is equal to the number of amino acids (8) minus one, which gives the result.

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Amino Acids

Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid consists of a central carbon atom, an amino group, a carboxyl group, a hydrogen atom, and a variable side chain (R group). In proteins, amino acids are linked together by peptide bonds to form polypeptides, which fold into functional proteins.
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Amino Acid Catabolism: Amino Group Example 2

Peptide Bonds

Peptide bonds are covalent chemical bonds that link amino acids together in a protein. They form through a dehydration synthesis reaction, where the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water. Each peptide bond connects two amino acids, contributing to the protein's primary structure.
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1:24
Peptides Example 1

Protein Structure

Protein structure refers to the three-dimensional arrangement of amino acids in a protein, which determines its function. The primary structure is the linear sequence of amino acids linked by peptide bonds. Understanding the number of amino acids helps in determining the number of peptide bonds, as each bond forms between two amino acids, leading to one less bond than the total number of amino acids.
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Quaternary Protein Structure Concept 1
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Tripeptides are composed of three amino acids linked by peptide bonds. Given a set of amino acids, you can make several different tripeptides.

a. Use the three-letter shorthand notations to name all the tripeptides that can be made from serine, tyrosine, and glycine. Each amino acid will be used once in each tripeptide.

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How many ways can four different amino acids be arranged in a peptide so that each peptide is unique?

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Identify the amino acids in the following dipeptide and tripeptide, and write the abbreviated forms of the peptide names. Copy the dipeptides, draw a box around the peptide bonds, and use an arrow to identify the α-carbon atoms. Draw a circle around the R groups, and indicate if the R groups are neutral, polar, acidic, or basic.

a.

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Domanda del libro di testo

Using three-letter abbreviations, show the six tripeptides that contain isoleucine, arginine, and valine.

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What atoms are present in a planar unit in a protein chain?

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Domanda del libro di testo

How many amino acid units do these atoms come from? Why are these units planar?

863
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