Domanda del libro di testo
Which of the following forms of aspartic acid would you expect to predominate at low pH, neutral pH, and high pH?
a.
b.
c.
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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 50
Is phenylalanine hydrophilic or hydrophobic? Explain why.
Guida verificata passo dopo passo1
Phenylalanine is an amino acid with a side chain that contains a benzyl group (a benzene ring attached to a CH2 group). To determine if it is hydrophilic or hydrophobic, we need to analyze the properties of its side chain.
Hydrophilic molecules or groups are typically polar or charged, meaning they can interact with water through hydrogen bonding or ionic interactions. Hydrophobic molecules or groups are nonpolar and do not interact well with water.
The benzyl group in phenylalanine's side chain is nonpolar because the benzene ring is composed of carbon and hydrogen atoms, which share electrons relatively equally, resulting in no significant polarity.
Since the side chain of phenylalanine is nonpolar, it does not form hydrogen bonds or interact favorably with water. This makes phenylalanine hydrophobic.
In summary, phenylalanine is hydrophobic because its side chain is nonpolar and does not interact well with water.
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Hydrophilicity and Hydrophobicity
Hydrophilicity refers to the tendency of a molecule to interact favorably with water, often due to the presence of polar or charged groups. In contrast, hydrophobicity describes a molecule's aversion to water, typically associated with nonpolar structures. Understanding these properties is crucial for predicting how substances behave in biological systems, particularly in relation to solubility and interaction with cellular membranes.
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Percorso guidato
2:00
Fatty Acids Concept 1
Amino Acid Structure
Amino acids, the building blocks of proteins, have a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R group (side chain). The nature of the R group determines the amino acid's properties, including whether it is hydrophilic or hydrophobic. In the case of phenylalanine, its aromatic side chain contributes to its hydrophobic characteristics.
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3:03Amino Acid Catabolism: Amino Group Example 2
Phenylalanine's Chemical Properties
Phenylalanine is an aromatic amino acid with a nonpolar side chain, which makes it hydrophobic. The presence of the benzyl group in its structure prevents it from forming hydrogen bonds with water, leading to its preference for nonpolar environments. This property is significant in protein folding and function, as hydrophobic interactions play a key role in stabilizing protein structures.
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Percorso guidato
02:11Chemical Properties Example 1
Pratica correlata
Domanda del libro di testo
Which form of aspartic acid in Problem 18.54 is the zwitterion? What is the pI for the zwitterion?
a.
b.
c.
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Domanda del libro di testo
Draw leucine and identify any chiral carbon atoms with arrows.
953
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Domanda del libro di testo
At neutral pH, which of the following amino acids has a net positive charge, which has a net negative charge, and which is neutral? (Hint: Draw the various charged forms of each amino acid before deciding.)
a. Asparagine
b. Lysine
c. Proline
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Domanda del libro di testo
Name and draw the structures of the amino acids that fit the following descriptions:
a. Contains a thiol group
53
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Domanda del libro di testo
Name and draw the structures of the amino acids that fit the following descriptions:
a. Contains an isopropyl group
33
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