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Biochemistry
Written by Dr. Ayesha Nadeem (Chemistry)
9 Class 10 Chemistry questions with answers and explanations.
Printable worksheet with answer key
All questions with answers
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Proteins are polymers of:
- 1 Amino acids
- 2 Nucleotides
- 3 Fatty acids
- 4 Glucose
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Correct answer: Amino acids
Amino acids join through peptide bonds to form proteins.
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Starch is a polymer of:
- 1 Ethene
- 2 Amino acids
- 3 Glucose
- 4 Glycerol
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Correct answer: Glucose
Starch is made of many glucose units.
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Fats are esters of glycerol and:
- 1 Sugars
- 2 Fatty acids
- 3 Amino acids
- 4 Alcohol only
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Correct answer: Fatty acids
A fat is formed from glycerol and three fatty acids.
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Which vitamin is fat soluble?
- 1 Vitamin A
- 2 Vitamin C
- 3 Vitamin B
- 4 Vitamin B12
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Correct answer: Vitamin A
Vitamins A, D, E and K dissolve in fat.
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Enzymes are biological:
- 1 Salts
- 2 Catalysts
- 3 Fuels
- 4 Acids
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Correct answer: Catalysts
Enzymes speed up reactions in living things.
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Glucose has the formula:
- 1 C6H12O6
- 2 C6H6
- 3 CH4
- 4 C12H22O11
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Correct answer: C6H12O6
Glucose is C6H12O6.
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Which nutrient gives the most energy per gram?
- 1 Vitamins
- 2 Fats
- 3 Proteins
- 4 Carbohydrates
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Correct answer: Fats
Fats give about 37 kJ per gram.
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DNA stores:
- 1 Genetic information
- 2 Energy only
- 3 Water
- 4 Salts
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Correct answer: Genetic information
Genes are made of DNA.
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Cellulose is the main part of:
- 1 Bones
- 2 Animal cells
- 3 Plant cell walls
- 4 Blood
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Correct answer: Plant cell walls
Plant cell walls are made of cellulose.
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