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

1. Introduction to Biochemistry

Lipids

Biochemistry

1. Introduction to Biochemistry

Lipids

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Multiple Choice

Which of the following statements about steroids is correct?

Steroids are nucleic acids because they contain nitrogenous bases.

Steroids are carbohydrates because they contain multiple hydroxyl groups.

Steroids are proteins because they are composed of amino acids.

Steroids are classified as lipids because they are hydrophobic and derived from isoprene units.

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Verified step by step guidance

Understand the definition of steroids: Steroids are a class of lipids characterized by a structure consisting of four fused carbon rings. They are hydrophobic molecules, meaning they do not dissolve in water.

Analyze the incorrect options: Steroids are not nucleic acids because they do not contain nitrogenous bases, which are characteristic of DNA and RNA. Steroids are not carbohydrates because they lack the typical structure of carbohydrates, such as a chain of sugar molecules. Steroids are not proteins because they are not composed of amino acids, which are the building blocks of proteins.

Focus on the correct classification: Steroids are classified as lipids because they are hydrophobic and derived from isoprene units. Lipids are a broad category of molecules that include fats, oils, and steroids, all of which share the property of being insoluble in water.

Relate the hydrophobic nature of steroids to their biological function: The hydrophobic nature of steroids allows them to interact with cell membranes and act as signaling molecules, such as hormones (e.g., testosterone, estrogen, and cortisol).

Conclude with the structural basis of steroids: The four-ring structure of steroids is derived from isoprene units, which are small hydrocarbon molecules. This structural feature is key to their classification as lipids.