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

Leucoplasts store starch.

  1. True

  2. False

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

Leucoplasts are a type of plastid that lack pigments and are primarily used for the storage of starch, lipids, or proteins.

Multiple choice

Which of the following sugars is found in honey?

  1. Dextrose

  2. Ribose

  3. Pentose

  4. Sucrose

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

Honey is primarily composed of simple sugars, specifically glucose (also known as dextrose) and fructose. Dextrose is the common name for the D-isomer of glucose.

Multiple choice

Cell wall of bacteria is composed of

  1. peptidoglycans

  2. cellulose

  3. chitin

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

Cell wall of bacteria is composed of peptidoglycans. Peptidoglycans is a complex of proteins and carbohydrates.

Multiple choice

Chemically, cane sugar is

  1. lactose

  2. glucose

  3. sucrose

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

Cane sugar is the common name for sucrose, a disaccharide made of glucose and fructose.

Multiple choice

R.Q. for glucose is

  1. 0.05

  2. 0.5

  3. 1

  4. 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Respiratory Quotient (RQ) for carbohydrates like glucose is 1, because the volume of CO2 released equals the volume of O2 consumed during aerobic respiration.

Multiple choice

Assertion: Snf3 is able to bind even high amounts of glucose. Reason: Snf3 is a plasma membrane protein in yeast that consists of 3 transmembrane domains.

  1. A and R both are correct and R is the correct explanation of A.

  2. A and R both are correct and R is not the correct explanation of A.

  3. A is correct and R is incorrect.

  4. A is incorrect and R is correct.

  5. A and R both are incorrect.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This option is correct. Snf3 is able to bind even low amounts of glucose and Snf3 is a plasma membrane protein in yeast that consists of 12 transmembrane domains.

Multiple choice

Which of the following is a polysaccharide that is derived by chemical expurgation from natural starch and is used for making toilet paper and paper towels?

  1. Acetylated distarch adipate

  2. Amylomaize

  3. Amylopectin

  4. Cycloamylose

  5. Dialdehyde starch
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This option is correct. Dialdehyde starch is a polysaccharide that is derived by chemical expurgation from natural starch and is used for making toilet paper and paper towels.

Multiple choice

Assertion (A): Dissolved amylopectin starch has less propensity of gelling during storage and cooling. Reason (R): Dextrose units are connected in a linear way with α(1 → 4) glycosidic linkages and branching takes place with α(1→6) bonds.

  1. A and R both are correct and R is the correct explanation of A.

  2. A and R both are correct and R is not the correct explanation of A.

  3. A is correct and R is incorrect.

  4. A is incorrect and R is correct.

  5. A and R both are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dissolved amylopectin starch has less propensity of gelling during storage and cooling because dextrose units are connected in a linear way with α(1 → 4) glycosidic linkages and branching takes place with α(1 → 6) bonds. Thus, this option is correct.

Multiple choice

Which of the following statements is/are incorrect regarding amylopectin?

  1. It has a highly ramified structure that is formed of 2000 to 20000 glucose units.
  2. When energy is needed for cell work, the plant hydrolyses the amylopectin, releasing the glucose subunits.
  3. Branching takes place with α(1 → 4) linkages occurring after every 24 to 30 glucose units.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct. Branching takes place with α(1→6) linkages occurring after every 24 to 30 glucose units, not α(1→4) linkage.