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

Functional Groups

Biochemistry

1. Introduction to Biochemistry

Functional Groups

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Multiple Choice

Which of the following biomolecules contains three ester functional groups?

Sucrose

Cholesterol

Phosphatidylcholine

Triacylglycerol

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Verified step by step guidance

Step 1: Begin by understanding the structure of an ester functional group. An ester group is characterized by the chemical formula R-COOR', where R and R' are alkyl or aryl groups. It is formed by the reaction between a carboxylic acid and an alcohol.

Step 2: Analyze the structure of each biomolecule provided in the options. Sucrose is a disaccharide composed of glucose and fructose linked by a glycosidic bond, and it does not contain ester groups.

Step 3: Examine cholesterol. Cholesterol is a sterol with a hydroxyl group (-OH) and a hydrocarbon tail, but it does not contain ester groups in its basic structure.

Step 4: Review phosphatidylcholine. This molecule is a phospholipid containing a phosphate group, choline, and two fatty acid chains. While it contains ester bonds linking the fatty acids to glycerol, it does not have three ester groups.

Step 5: Finally, analyze triacylglycerol. Triacylglycerol is composed of a glycerol backbone esterified to three fatty acid chains. Each fatty acid is linked to glycerol via an ester bond, resulting in a total of three ester functional groups. This matches the criteria in the question.