Biology · Chemistry

Carbohydrates and Biomolecules

1,073 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

In which form do fungi store its food?

  1. Protein

  2. Starch

  3. Glycogen

  4. Fat

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

Fungi, like animals, store their food reserves as glycogen. Plants store starch, while proteins and fats are not primary storage molecules in fungi. This is one of the characteristics that distinguishes fungi from plants.

Multiple choice

What happens to glucose during strenuous exercise?

  1. It is converted to glycogen.

  2. It is converted to pyruvic acid .

  3. It is converted to starch.

  4. It is converted to lactic acid.

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

During strenuous exercise, when oxygen supply cannot meet the demand, muscle cells undergo anaerobic respiration. Pyruvate from glycolysis is converted to lactic acid (lactate) instead of entering the Krebs cycle. This allows glycolysis to continue by regenerating NAD+. Glycogen is broken down to glucose (not vice versa), and starch is not involved in animal metabolism.

Multiple choice

Digestion of which of the following constituent of food is most complex?

  1. Lactose

  2. Glucose

  3. Fructose

  4. Starch

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

Starch is a polysaccharide that requires breakdown into simpler sugars before absorption. It must first be digested by salivary and pancreatic amylase into maltose, then further broken down by maltase into glucose. Lactose (a disaccharide) only requires lactase, while glucose and fructose are monosaccharides that can be absorbed directly without digestion.

Multiple choice

A pound of butter contains more usable energy than a pound of sugar for a human, because _________.

  1. sugar contains much more water than butter

  2. a fat molecule has more carbon-hydrogen bonds than a sugar molecule

  3. butter is an animal product, whereas the sugar is a plant product

  4. there is much more wastage in digestion and absorption of sugar than that of butter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Butter is a rich source of fat, and sugars are carbohydrates. A fat molecule has more carbon-hydrogen bonds than a sugar molecule. Thus, a large amount of energy can be obtained by the breakdown of fat molecules as compare to the same amount of carbohydrates.

Multiple choice

The shape-determining part of the bacterial cell wall is a polymer of:

a. N-acetyl glucosamine (NAG) and N-acetyl muramic acid (NAM) b. N-acetyl glucosamine and diamino pimelic acid (DAPA) c. N-acetyl muramic acid and diamino pimelic acid d. N- acetyl glucosamine, N-acetyl muramic acid and diamino pimelic acid

Which of these options is correct?

  1. Only a

  2. Only b

  3. Only c

  4. Only d
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The shape-determining part of a cell is the cell wall. It is made up of peptidoglycan, which is a polymer of NAG, NAM and DAPA.

Multiple choice

Glucose is converted into glycogen in the liver and stored in

  1. liver

  2. liver and spleen

  3. liver and muscles

  4. spleen and muscles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glycogen is the storage form of glucose in animals. After glucose is converted to glycogen in the liver, it is stored in both the liver (about 100-120g) and skeletal muscles (about 300-400g in an adult). Liver glycogen maintains blood glucose levels, while muscle glycogen provides energy for muscle contraction during exercise. Spleen does not store glycogen.

Multiple choice

In plants, carbohydrates get converted to

  1. starch

  2. roughage

  3. fatty acid

  4. glycogen

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

The carbohydrates, i.e. the glucose formed during photosynthesis in plants is converted to starch as an energy reserve.