Domanda del libro di testo
Valine is an amino acid with a nonpolar side chain and serine is one with a polar side chain. Draw the two amino acids.
a. Why is the side chain for valine nonpolar, whereas the side chain for serine is polar?
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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 6
Using Table 18.3, name the α-amino acids that (a) contain an aromatic ring, (b) contain sulfur, (c) are alcohols, and (d) have alkyl-group side chains.
Guida verificata passo dopo passo1
Step 1: Understand the problem. The question asks us to identify α-amino acids based on specific structural features: (a) aromatic rings, (b) sulfur atoms, (c) alcohol groups, and (d) alkyl-group side chains. Refer to Table 18.3 for the list of amino acids and their structures.
Step 2: For part (a), identify amino acids with aromatic rings. Aromatic rings are cyclic structures with alternating double bonds (e.g., benzene). Look for amino acids like phenylalanine, tyrosine, and tryptophan, which contain aromatic groups in their side chains.
Step 3: For part (b), identify amino acids containing sulfur. Sulfur is present in the side chains of amino acids like cysteine (–SH group) and methionine (–S– group).
Step 4: For part (c), identify amino acids that are alcohols. Alcohol groups are characterized by the –OH functional group. Amino acids like serine and threonine have –OH groups in their side chains.
Step 5: For part (d), identify amino acids with alkyl-group side chains. Alkyl groups are simple hydrocarbon chains or branches. Examples include glycine (H side chain), alanine (–CH₃), valine, leucine, and isoleucine, which all have alkyl groups in their side chains.
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Amino Acid Structure
Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid has a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable side chain (R group) that determines its properties. Understanding the structure of amino acids is essential for identifying their classifications based on functional groups.
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Percorso guidato
3:03
Amino Acid Catabolism: Amino Group Example 2
Functional Groups in Amino Acids
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In amino acids, common functional groups include hydroxyl (-OH) for alcohols, thiol (-SH) for sulfur-containing amino acids, and aromatic rings for those with aromatic properties. Recognizing these groups helps in categorizing amino acids based on their side chains.
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2:21Amino Acid Catabolism: Amino Group Concept 2
Classification of Amino Acids
Amino acids can be classified based on the properties of their side chains into categories such as nonpolar, polar, aromatic, and sulfur-containing. This classification is crucial for understanding their roles in protein structure and function. For example, aromatic amino acids like phenylalanine have unique properties due to their ring structure, while sulfur-containing amino acids like cysteine play important roles in protein stability.
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1:33Amino Acid Classifications Example 3
Pratica correlata
Domanda del libro di testo
Examine the ball-and-stick model of valine below. Identify the carboxyl group, the amino group, and the R group.
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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
Indicate whether each of the following molecules is an α-amino acid or not, and explain why.
a.
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Domanda del libro di testo
Which amino acid is hydrophilic (dissolves in aqueous solutions)? Why?
a. isoleucine
b. phenylalanine
c. aspartic acid
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Domanda del libro di testo
Consult Table 18.3 and draw alanine. Label the functional groups and give the three-letter abbreviation and the one-letter abbreviation. What group does the side chain fall into?
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