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Ch.16 Amino Acids, Proteins, and Enzymes
Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 14th Edition
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Timberlake 14th EditionCh.16 Amino Acids, Proteins, and Enzymes문제 28c
16장, 문제 28c

Indicate the changes in secondary and tertiary structural levels of proteins for each of the following:
c. To avoid spoilage, seeds are treated with a solution of HgCl2.

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Understand the structural levels of proteins: Proteins have four levels of structure—primary, secondary, tertiary, and quaternary. Secondary structure refers to local folding patterns like alpha-helices and beta-sheets, stabilized by hydrogen bonds. Tertiary structure refers to the overall 3D shape of the protein, stabilized by interactions such as hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges.
Recognize the chemical properties of HgCl₂: Mercury(II) chloride (HgCl₂) is a heavy metal compound that can disrupt protein structures by interacting with functional groups, particularly thiol (-SH) groups in cysteine residues.
Analyze the impact on secondary structure: HgCl₂ can interfere with hydrogen bonding, which is crucial for maintaining alpha-helices and beta-sheets. This disruption can lead to the unfolding or alteration of the secondary structure.
Analyze the impact on tertiary structure: HgCl₂ can bind to thiol groups in cysteine residues, forming mercaptide bonds. This disrupts disulfide bridges, which are critical for maintaining the tertiary structure, leading to denaturation or loss of the protein's 3D shape.
Conclude the overall effect: The treatment with HgCl₂ causes denaturation of proteins by altering both secondary and tertiary structures. This denaturation prevents the proteins from functioning properly, which is likely the intended effect to avoid spoilage in seeds.

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Protein Structure Levels

Proteins have four levels of structure: primary, secondary, tertiary, and quaternary. The primary structure is the sequence of amino acids, while secondary structure refers to local folding patterns like alpha helices and beta sheets. Tertiary structure is the overall three-dimensional shape of a protein, determined by interactions among various side chains. Understanding these levels is crucial for analyzing how treatments like HgCl₂ affect protein stability and function.
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가이드 코스
2:56
Summary of Protein Structure Concept 1

Denaturation

Denaturation is the process by which proteins lose their native structure due to external stressors, such as heat, pH changes, or chemical agents like HgCl₂. This process can disrupt secondary and tertiary structures, leading to loss of function. In the context of seed treatment, denaturation can prevent spoilage by inactivating enzymes and pathogens, thereby preserving the seeds.
추천 영상:
가이드 코스
1:17
Digestion of Proteins Example 1

Mercuric Chloride (HgCl₂) as a Preservative

Mercuric chloride (HgCl₂) is a chemical compound used as a preservative and disinfectant due to its ability to denature proteins and kill microorganisms. When seeds are treated with HgCl₂, it alters the protein structures within the seeds, effectively preventing spoilage by inhibiting microbial growth. Understanding its mechanism helps in evaluating its effectiveness and potential risks in agricultural practices.
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가이드 코스
03:28
Naming Monoatomic Cations Concept 2
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교과서 질문

Indicate whether each of the following statements describes primary, secondary, tertiary, or quaternary protein structure:

b. Protein chains of collagen form a triple helix.

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교과서 질문

Indicate whether each of the following statements describes primary, secondary, tertiary, or quaternary protein structure: 

c. Several polypeptides in a beta-pleated sheet are held together by hydrogen bonds between adjacent chains.

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교과서 질문

Indicate the changes in secondary and tertiary structural levels of proteins for each of the following:

b. Prior to giving an injection, the skin is wiped with an alcohol swab.

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What is the name of the class of enzymes that would catalyze each of the following reactions?

c. converting glucose (C6H12O6) to fructose (C6H12O6).

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교과서 질문

Why do chemical reactions in the body require enzymes?

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What is the reactant for each of the following enzymes?

a. galactase

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