Textbook Question
How many ways can four different amino acids be arranged in a peptide so that each peptide is unique?
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Ch.18 Amino Acids and Proteins
McMurry8th EditionFundamentals of GOBISBN: 9780134015187
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Table of contents
- 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
Chapter 18, Problem 25a
Complete the following two sentences with either globular or fibrous:
a. Proteins with secondary structure composed primarily of alpha-helix are___________ proteins.
Verified step by step guidance1
Understand the two main types of protein structures: globular and fibrous. Globular proteins are typically compact, spherical, and soluble in water, while fibrous proteins are elongated, insoluble, and provide structural support.
Recall that the secondary structure of proteins refers to the local folding patterns of the polypeptide chain, such as alpha-helices and beta-sheets.
Recognize that alpha-helices are a common feature in fibrous proteins, which are often involved in structural roles, such as keratin in hair and collagen in connective tissues.
Note that globular proteins, on the other hand, often have a mix of alpha-helices and beta-sheets and are involved in dynamic functions like enzymatic activity or transport.
Based on the description of the secondary structure being primarily alpha-helix, identify that the correct term to complete the sentence is 'fibrous' proteins.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Globular Proteins
Globular proteins are typically spherical in shape and are soluble in water. They play crucial roles in various biological functions, including enzyme activity, transport, and immune responses. Their structure is often stabilized by hydrophilic interactions on the outside and hydrophobic interactions on the inside, allowing them to function effectively in aqueous environments.
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Digestion of Proteins Concept 1
Fibrous Proteins
Fibrous proteins are elongated and insoluble in water, providing structural support and strength to cells and tissues. They are characterized by repetitive sequences of amino acids that form long chains, which can aggregate to form fibers. Examples include collagen in connective tissues and keratin in hair and nails, which contribute to the mechanical properties of these structures.
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Alpha-Helix Structure
The alpha-helix is a common secondary structure in proteins, characterized by a right-handed coil where each turn of the helix is stabilized by hydrogen bonds between the backbone amide and carbonyl groups. This structure is crucial for the overall stability and functionality of globular proteins, as it contributes to their three-dimensional shape and interactions with other molecules.
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Related Practice
Textbook Question
Examine the α-helix in Figure 18.1 and determine how many backbone C and N atoms are included in the loop between an amide hydrogen atom and the carbonyl oxygen to which it is hydrogen bonded.
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Textbook Question
Consult the β-sheet in Figure 18.2 and (a) name the bonding responsible for the sheet formation and (b) identify the specific atoms responsible for this bonding.
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Textbook Question
For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.
a. Cholesterol is attached to this protein in order to move through the blood system.
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Textbook Question
For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.
b. Ionized zinc is attached to this protein so the protein can function.
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Textbook Question
For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.
c. Phosphate groups are attached to this protein.
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