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 biology digestion and absorption liver functions of the liver secretory organs

Which one of the following statements about glycogen is correct?

  1. It is a disaccharides stored in liver which can react with ammonia to form proteins

  2. It is synthesized in the liver and takes part in the formation of bile and lipase, besides being a source of energy

  3. It is a polysaccharide which is synthesized and stored in liver cells

  4. It is synthesized in blood and stored in liver and muscles to provide glucose in tomes of need
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

The food stored in the liver is in the form of

  1. Albumen

  2. Glucose

  3. Glycogen

  4. Amino acids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Once glucose is inside the liver, glucose is phosphorylated into glucose-6-phosphate, or G6P. G6P is further metabolized into triglycerides, fatty acids, glycogen or energy. Glycogen is the form in which the body stores glucose. The liver can only store about 100 g of glucose in the form of glycogen. 

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Statement 1: Blood sugar level falls rapidly after hepatectomy.


Statement 2: The glycogen of the liver is the principal source of blood sugar in case of an emergency.

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • In the liver, Glycogen a reserve food material is changed into glucose(sugar) (by gluconeogenesis) and released into the blood. when hepatectomy(surgical removal of the liver) is done it leads to rapid fall of blood sugar. Hence Blood sugar level falls rapidly after hepatectomy is a correct statement.
  • During emergency conditions, the liver can convert proteins and fats i.e gluconeogenesis. Hence The glycogen of the liver is the principal source of blood sugar in case of emergency.is an incorrect statement
  • So, the correct answer is 'Statement 1 is correct but statement 2 is incorrect'.
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Glycogenesis refers to

  1. Conversion of glycogen to glucose.

  2. Breakdown of glucose to form pyruvate.

  3. Breakdown of pyruvate to form glucose.

  4. Conversion of glucose to glycogen.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glycogenesis is the process of glycogen synthesis, in which glucose molecules are added to chains of glycogen for storage. This process is activated during rest periods following the Cori cycle, in the liver, and also activated by insulin in response to high glucose levels. Mostly glycogenesis occurs in the liver.

Multiple choice

What is the name of the sugar formed during photosynthesis?

  1. fructose

  2. glucose

  3. lactose

  4. pentose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthesis produces glucose (C6H12O6) as the primary energy-storing sugar. Fructose, lactose, and pentose are other types of sugars not directly produced as the main output of photosynthesis.

Multiple choice

An example of a complex carbohydrate is?

  1. whole grain bread

  2. candy bar

  3. orange juice

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

Complex carbohydrates consist of long chains of sugar molecules, which take longer for the body to break down, providing sustained energy. Whole grain bread is a great example, whereas candy, orange juice, and honey contain simple sugars that are digested quickly.

Multiple choice

How many calories are in a gram of Carbohydrates?

  1. 4

  2. 3.75

  3. 9

  4. 6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrates provide 4 kilocalories of energy per gram. In comparison, protein also provides 4 kilocalories per gram, while fat provides 9 kilocalories per gram.

Multiple choice

What happens to carbohydrates in the body?

  1. They take time for the body to process

  2. They are easily digested and broken down into glucose

  3. They turn into maltose particles to help the body process

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Digestible carbohydrates are easily broken down by digestive enzymes into glucose, which is then rapidly absorbed into the bloodstream to provide quick energy for body cells.

Multiple choice

What are the two types of carbohydrates?

  1. Simple and Complex

  2. Simple and Hard

  3. Easy and Strong

  4. Light and dark
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrates are broadly classified into simple carbohydrates (sugars) and complex carbohydrates (starches and fibers). Simple carbohydrates are quickly digested, while complex carbohydrates provide more sustained energy.

Multiple choice

What are the subcategories of carbohydrates?

  1. Sugars, starches, and fats

  2. Starches, wheat, and oils

  3. Sugars, starches, and dietary fibre

  4. Dietary fibre, sugars, and fats
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The three main subcategories of carbohydrates are sugars (simple carbohydrates), starches (complex carbohydrates), and dietary fiber (indigestible complex carbohydrates). Fats and oils are lipids, not carbohydrates.

Multiple choice

What are the building block of carbohydrates?

  1. Grain

  2. Sugar

  3. Water

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

Monosaccharides, which are simple sugars like glucose, serve as the fundamental building blocks of all carbohydrates. Grains contain carbohydrates, while proteins and water are entirely different substances.