Biology · Chemistry

Carbohydrates and Biomolecules

986 Questions

Carbohydrates and biomolecules questions test your understanding of sugars, monosaccharides, and metabolic substrates. The topic covers food transportation in plants and the biochemical properties of sweeteners. Practicing these questions builds a strong foundation for exam preparation.

Disaccharides and monosaccharidesArtificial sweetenersGlycogen storagePlant food transportGlycoprotein hormones

Carbohydrates and Biomolecules Questions

Multiple choice

Which of the following is the correct order of absorption rate of the monosaccharides by the intestinal mucosa?

  1. Arabinose > Xylose > Mannose > Fructose > Glucose > Galactose

  2. Glucose > Fructose > Galactose > Mannose > Xylose > Arabinose

  3. Galactose > Fructose > Glucose > Mannose > Xylose > Arabinose

  4. Galactose > Glucose > Fructose > Xylose > Mannose > Arabinose

  5. Glucose > Fructose > Galactose > Xylose > Arabinose > Mannose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glucose and galactose are absorbed mainly by the jejuna enterocytes, against a concentration gradient, by a sodium-dependent active transport mechanism. Fructose crosses the apical membrane of enterocytes of the jejunum by facilitated (mediated) diffusion. Since this transfer is not energy dependent, fructose cannot be absorbed against a concentration gradient. Limited absorption of xylose, mannose, and arabinose seems to occur by a diffusion mechanism. This difference in mechanism of absorption of monosaccharides accounts for their absorption by the intestinal mucosa.

Multiple choice

Which of the following is/are homopolysaccharide(s)?

  1. Dextran

  2. Glycogen

  3. Both 1 and 2

  4. Hyaluronic acid

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Homopolysaccharides are polysaccharides composed of a single type of monosaccharide unit. Both Dextran (glucose units) and Glycogen (glucose units) are homopolysaccharides.

Multiple choice

In what form is the food in onion stored?

  1. Sugar

  2. Cellulose

  3. Starch

  4. Protein
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In onions, food is primarily stored in the fleshy bulb scales in the form of sugars, specifically carbohydrates like glucose and fructans. Starch is the primary storage polysaccharide in many other plants like potatoes, but Allium species typically store non-structural carbohydrates as soluble sugars.

Multiple choice

Which media cannot be used in electrophoresis?

  1. Cellulose acetate

  2. Paper

  3. Agar gel

  4. Starch grains

  5. Polyacrylamide gel
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Here, mixing occurs between the zones due to adsorption of the molecules on the cellulose, hence it cannot be used.