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

9. Carbohydrates

Monosaccharides

Biochemistry

9. Carbohydrates

Monosaccharides

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Multiple Choice

Which of the following statements regarding absorption of monosaccharides is true?

Glucose and galactose are absorbed in the small intestine via sodium-dependent active transport.

All monosaccharides are absorbed exclusively by facilitated diffusion.

Fructose is absorbed by simple diffusion across the intestinal epithelium.

Monosaccharide absorption occurs primarily in the large intestine.

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Verified step by step guidance

Step 1: Begin by understanding the process of monosaccharide absorption in the human body. Monosaccharides such as glucose, galactose, and fructose are absorbed in the small intestine, not the large intestine. This eliminates the option stating absorption occurs primarily in the large intestine.

Step 2: Recall the mechanisms of transport across the intestinal epithelium. Glucose and galactose are absorbed via sodium-dependent active transport, specifically through the SGLT1 (sodium-glucose linked transporter 1). This process requires energy and involves coupling the transport of sodium ions with the monosaccharides.

Step 3: Fructose, on the other hand, is absorbed by facilitated diffusion through the GLUT5 transporter. Facilitated diffusion does not require energy but relies on a concentration gradient. This eliminates the option stating fructose is absorbed by simple diffusion.

Step 4: Evaluate the statement that all monosaccharides are absorbed exclusively by facilitated diffusion. This is incorrect because glucose and galactose use active transport, not facilitated diffusion. Fructose is the only monosaccharide absorbed by facilitated diffusion.

Step 5: Conclude that the correct statement is: 'Glucose and galactose are absorbed in the small intestine via sodium-dependent active transport.' This aligns with the known mechanisms of monosaccharide absorption in the small intestine.