Domanda del libro di testo
Two of the 20 common amino acids have two chiral carbon atoms in their structures. Identify these amino acids and their chiral carbon atoms.
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Ch.18 Amino Acids and Proteins
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 18, Problema 15
Valine is an amino acid with a nonpolar side chain, and serine is an amino acid with a polar side chain. Draw the two dipeptides that can be formed by these two amino acids. Identify the peptide bond.
Guida verificata passo dopo passo1
Step 1: Understand the structure of the amino acids. Valine has a nonpolar side chain (isopropyl group), and serine has a polar side chain (hydroxymethyl group). Both amino acids have an amino group (-NH₂) and a carboxyl group (-COOH) attached to the central carbon (α-carbon).
Step 2: Recall how a peptide bond is formed. A peptide bond is a covalent bond formed between the carboxyl group of one amino acid and the amino group of another amino acid through a condensation reaction, which releases a molecule of water (H₂O).
Step 3: Draw the first dipeptide where valine is the N-terminal amino acid (the amino acid with the free -NH₂ group). Connect the carboxyl group of valine to the amino group of serine, forming the peptide bond. Label the peptide bond as the C-N bond formed during the reaction.
Step 4: Draw the second dipeptide where serine is the N-terminal amino acid. Connect the carboxyl group of serine to the amino group of valine, forming the peptide bond. Again, label the peptide bond as the C-N bond formed during the reaction.
Step 5: Verify the structures of both dipeptides. Ensure that the peptide bonds are correctly formed, the side chains of valine and serine are intact, and the terminal groups (free -NH₂ and -COOH) are correctly positioned for each dipeptide.
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Concetti chiave
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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 distinctive side chain (R group) that determines its properties. Valine, with a nonpolar side chain, is hydrophobic, while serine, with a polar side chain, is hydrophilic, influencing their interactions in proteins.
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Percorso guidato
3:03
Amino Acid Catabolism: Amino Group Example 2
Dipeptides
Dipeptides are molecules formed when two amino acids are linked together by a peptide bond. This bond is created through a dehydration synthesis reaction, where a water molecule is released as the carboxyl group of one amino acid reacts with the amino group of another. The resulting dipeptide retains the characteristics of both amino acids, influencing its overall properties and functions.
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Percorso guidato
2:27Peptides Example 2
Peptide Bond
A peptide bond is a covalent bond that links amino acids together in a protein. It forms between the carboxyl group of one amino acid and the amino group of another, resulting in the release of a water molecule. This bond is crucial for the structure and function of proteins, as it determines the sequence and arrangement of amino acids in polypeptides.
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Percorso guidato
1:24Peptides Example 1
Pratica correlata
Domanda del libro di testo
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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Domanda del libro di testo
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
Draw the structure of glutamic acid at low pH, at high pH, and at the two forms that exist between low pH and high pH. Which of these structures represents the zwitterion?
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Domanda del libro di testo
Is serine chiral? Draw serine and identify the chiral atom. Explain why serine is chiral.
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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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