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 is a difference between glucose and fructose?

Glucose forms a five-membered ring, while fructose forms a six-membered ring.

Glucose is an aldohexose, while fructose is a ketohexose.

Fructose is a reducing sugar, but glucose is not.

Both glucose and fructose have five carbon atoms.

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Verified step by step guidance

Step 1: Begin by understanding the structural differences between glucose and fructose. Glucose is classified as an aldohexose because it contains an aldehyde functional group (-CHO) at the first carbon atom, while fructose is classified as a ketohexose because it contains a ketone functional group (C=O) at the second carbon atom.

Step 2: Analyze the ring structures formed by glucose and fructose. Glucose typically forms a six-membered ring (pyranose) when cyclized, while fructose can form either a five-membered ring (furanose) or a six-membered ring (pyranose), depending on the reaction conditions.

Step 3: Evaluate the reducing sugar property. Both glucose and fructose are reducing sugars because they can donate electrons to other molecules in redox reactions. This property is due to the presence of a free aldehyde group in glucose and a free ketone group in fructose in their linear forms.

Step 4: Examine the number of carbon atoms in each molecule. Both glucose and fructose are hexoses, meaning they contain six carbon atoms, not five. This eliminates the statement that both have five carbon atoms.

Step 5: Conclude that the correct answer is: 'Glucose is an aldohexose, while fructose is a ketohexose,' based on the functional group differences and structural classifications of these two sugars.