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

Which of the following matchings is incorrect?

  1. Ribulose l,5-bisphosphate → 3-phosphoglycerate: Rubisco

  2. 3-Phospho glycerate → Glycerate 1,3-bisphosphate: Phosphoglycerate kinase

  3. Dihydroxy acetone phosphate → Fructose 1,6-bisphosphate: Aldolase

  4. Xylulose 5-phosphate → Ribulose 5-phosphate: ribose-5-phosphate isomerase

  5. Ribulose 5-phosphate → Ribulose 1,5,- bisphosphate: Phosphoribulokinase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is wrong because conversion of xylulose 5-phosphate to ribulose 5-phosphate is catalysed by ribulose-phosphate epimerase, whereas conversion of ribose 5-phosphate to ribulose 5-phosphate is catalysed by ribose-5-phosphate isomerise.

Multiple choice

Enzymes of lysosomes are tagged with

  1. D-mannose

  2. dianhydroglucopyranoses

  3. mannose-6-phosphate

  4. fructose-6-phosphate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lysosome enzymes are specifically tagged with the molecule mannose 6-phosphate to differentiate them from other enzymes.

Multiple choice

Which of the following substances is a mixture?

  1. Glucose

  2. Baking soda

  3. Tea

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

A mixture is a material which contains two or more different kinds of particles (atoms or molecules), which are physically mixed in any proportion, but not chemically combined. Tea is a mixture containing water, sugar, salt, milk and tea leaves mixed in different proportions.

Multiple choice

Which of the following pairs is not correctly matched?

  1. Cutin : Consists of long chain fatty acids and polyhydroxy derivative of these fatty acids

  2. Pectin : Methylated polymer of galacturonic acid

  3. Lignin : Formed by condensation of coniferyl alcohol

  4. Callose : Glycosylated aliphatic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Callose is a plant polysaccharide. It is composed of glucose residues.

Multiple choice

The enzyme invertase converts

  1. starch into glucose

  2. glucose into sucrose

  3. cellulose into starch

  4. sucrose into glucose and fructose

  5. cellulose into fructose
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice

A disaccharide present in the milk of mammals is known as

  1. fructose

  2. galactose

  3. glucose

  4. lactose

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

Lactose is the disaccharide sugar found in milk, composed of glucose and galactose. Fructose is fruit sugar, galactose is a component of lactose (not free in milk), and glucose is a monosaccharide. Mammalian milk is characterized by its lactose content.