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 statements regarding glucose is correct?

Glucose cannot form cyclic structures in aqueous solution.

Glucose is a ketopentose commonly found in DNA.

Glucose is an aldohexose with the molecular formula C_6H_{12}O_6.

Glucose is a disaccharide composed of two fructose units.

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Verified step by step guidance

Step 1: Begin by analyzing the molecular structure of glucose. Glucose is a monosaccharide with the molecular formula C₆H₁₂O₆. It contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms, which classifies it as a hexose sugar.

Step 2: Determine the functional group present in glucose. Glucose contains an aldehyde group (-CHO) at the first carbon atom, making it an aldohexose. This distinguishes it from ketoses, which have a ketone group.

Step 3: Evaluate the statement about cyclic structures. In aqueous solutions, glucose can form cyclic structures through intramolecular reactions between the aldehyde group and a hydroxyl group on the fifth carbon atom. This results in the formation of a hemiacetal ring structure, commonly observed as α-D-glucose or β-D-glucose.

Step 4: Address the statement about glucose being a ketopentose. A ketopentose is a five-carbon sugar with a ketone group, such as ribulose. Glucose is not a ketopentose; it is an aldohexose with six carbons and an aldehyde group.

Step 5: Clarify the statement about glucose being a disaccharide. Glucose is not a disaccharide; it is a monosaccharide. Disaccharides, such as sucrose or maltose, are composed of two monosaccharide units. Glucose can combine with other monosaccharides to form disaccharides, but it is not inherently composed of two fructose units.