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 of the following sugars is a pentose?

Glucose

Fructose

Galactose

Ribose

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Verified step by step guidance

Step 1: Understand the term 'pentose'. A pentose is a monosaccharide (simple sugar) that contains five carbon atoms in its structure. The general formula for pentoses is C₅H₁₀O₅.

Step 2: Review the structures of the given sugars. Glucose, fructose, and galactose are hexoses, meaning they contain six carbon atoms (C₆H₁₂O₆). Ribose, on the other hand, is a pentose with five carbon atoms (C₅H₁₀O₅).

Step 3: Recall the classification of sugars based on the number of carbon atoms. Hexoses (e.g., glucose, fructose, galactose) have six carbons, while pentoses (e.g., ribose) have five carbons.

Step 4: Confirm the structural formula of ribose. Ribose is a five-carbon sugar commonly found in nucleotides and nucleic acids, such as RNA. Its structure matches the definition of a pentose.

Step 5: Conclude that ribose is the correct answer because it is the only sugar in the list that meets the criteria of being a pentose (five-carbon sugar).