Table of contents

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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

1. Introduction to Biochemistry

Lipids

Biochemistry

1. Introduction to Biochemistry

Lipids

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Multiple Choice

What types of molecules are able to freely cross a semi-permeable membrane without an energy input?

Small, Polar molecules

Small, Nonpolar molecules

Large, Polar molecules

Large, Nonpolar molecules

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Verified step by step guidance

Understand the concept of a semi-permeable membrane: It allows certain molecules to pass through while blocking others, based on size and polarity.

Identify the characteristics of molecules that can freely cross the membrane: Typically, small and nonpolar molecules can pass through without energy input.

Consider the role of polarity: Nonpolar molecules can easily cross the lipid bilayer of cell membranes because they are not repelled by the hydrophobic core.

Evaluate the size of molecules: Smaller molecules can pass through more easily than larger ones due to less steric hindrance.

Apply these principles to the options given: Small, nonpolar molecules are the most likely to cross a semi-permeable membrane freely.