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

2. Water

Properties of Water

Biochemistry

2. Water

Properties of Water

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Multiple Choice

Phospholipids are described as amphipathic molecules. What does this mean?

They dissolve completely in water due to their polar nature.

They are made up of only nonpolar molecules.

They are composed entirely of hydrophobic fatty acid chains.

They contain both hydrophilic and hydrophobic regions.

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Verified step by step guidance

Understand the term 'amphipathic': Amphipathic molecules have both hydrophilic (water-attracting) and hydrophobic (water-repelling) regions. This dual nature allows them to interact with both water and nonpolar substances.

Examine the structure of phospholipids: Phospholipids consist of a hydrophilic phosphate head group and hydrophobic fatty acid tails. The head group is polar and interacts with water, while the tails are nonpolar and avoid water.

Compare the options provided: Evaluate each statement to determine if it aligns with the amphipathic nature of phospholipids. For example, the statement 'They dissolve completely in water due to their polar nature' is incorrect because the hydrophobic tails prevent complete dissolution.

Identify the correct answer: The statement 'They contain both hydrophilic and hydrophobic regions' accurately describes the amphipathic nature of phospholipids.

Relate this concept to biological membranes: Phospholipids form the bilayer structure of cell membranes, where the hydrophilic heads face outward toward the aqueous environment, and the hydrophobic tails face inward, creating a barrier.