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Biological molecules
6 Class 11 Biology questions with answers and explanations.
Printable worksheet with answer key
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Which element is present in all proteins but not in carbohydrates or fats?
- 1 Nitrogen
- 2 Hydrogen
- 3 Oxygen
- 4 Carbon
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Correct answer: Nitrogen
Amino acids contain an amino group, which carries nitrogen.
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The bond that joins two amino acids is a:
- 1 Glycosidic bond
- 2 Hydrogen bond
- 3 Peptide bond
- 4 Ester bond
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Glucose and fructose are:
- 1 Disaccharides
- 2 Polysaccharides
- 3 Lipids
- 4 Monosaccharides
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Sucrose is made of:
- 1 Glucose and galactose
- 2 Two fructose units
- 3 Two glucose units
- 4 Glucose and fructose
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Correct answer: Glucose and fructose
Sucrose is a disaccharide of glucose and fructose.
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Which polysaccharide is the storage form of glucose in animals?
- 1 Glycogen
- 2 Cellulose
- 3 Starch
- 4 Chitin
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Correct answer: Glycogen
Animals store glucose as glycogen in the liver and muscles.
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The sugar in DNA is:
- 1 Deoxyribose
- 2 Glucose
- 3 Fructose
- 4 Ribose