Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

9. Carbohydrates

Peptidoglycan

Biochemistry

9. Carbohydrates

Peptidoglycan

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Multiple Choice

Which of the following best describes the structure of the Gram-negative cell wall?

A thin layer of chitin with an outer membrane on top.

A thin peptidoglycan layer between two cell membranes.

A thick peptidoglycan layer with an outer membrane on top.

A thick peptidoglycan later under an outer membrane.

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Verified step by step guidance

Understand the basic structure of bacterial cell walls: Bacteria are classified into Gram-positive and Gram-negative based on their cell wall structure, which is determined by the Gram staining method.

Recognize the characteristics of Gram-positive bacteria: They have a thick peptidoglycan layer, which retains the crystal violet stain used in Gram staining, giving them a purple appearance.

Identify the features of Gram-negative bacteria: They have a thin peptidoglycan layer located between an inner cytoplasmic membrane and an outer membrane, which does not retain the crystal violet stain, resulting in a pink appearance after staining.

Compare the options given in the problem: Evaluate each description based on your understanding of Gram-negative cell wall structure.

Select the correct description: Based on the structural characteristics of Gram-negative bacteria, choose the option that accurately describes a thin peptidoglycan layer between two cell membranes.