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

Carbohydrates

Biochemistry

1. Introduction to Biochemistry

Carbohydrates

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Multiple Choice

Which organic molecule provides an immediate source of chemical energy within all cells?

Glycogen

Starch

Glucose

Cellulose

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Verified step by step guidance

Understand the context of the question: The problem is asking which organic molecule provides an immediate source of chemical energy within all cells. This requires knowledge of cellular metabolism and energy production.

Recall the primary energy currency of the cell: Cells use ATP (adenosine triphosphate) as their main energy currency, but ATP is synthesized from simpler molecules like glucose during cellular respiration.

Analyze the options provided: Glycogen, starch, and cellulose are polysaccharides, meaning they are complex carbohydrates. These molecules must be broken down into simpler sugars, such as glucose, before they can be used for energy production.

Focus on glucose: Glucose is a monosaccharide, a simple sugar that can be directly utilized in glycolysis, the first step of cellular respiration, to produce ATP. This makes glucose the immediate source of chemical energy.

Conclude based on biochemical principles: While glycogen and starch serve as storage forms of glucose in animals and plants respectively, and cellulose provides structural support in plants, glucose itself is the molecule that directly provides an immediate source of energy in cells.