Biology Objective Questions and Answers: Biomolecules
Access targeted multiple-choice questions for Biomolecules designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.
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Multiple Choice Questions
(a) Chitin - carbohydrate
(b) Pectin - protein
(c) Steroid - lipid
(d) Wax - lipid
Show Answer & Explanation
Answer: (b) Pectin - protein
Explanation:
1. Pectin is a polysaccharide (a carbohydrate), not a protein
2. The other three pairs are correct
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) liver and muscles
(b) liver only
(c) muscles only
(d) pancreas
Show Answer & Explanation
Answer: (a) liver and muscles
Explanation:
1. Glycogen is the storage carbohydrate of animals
2. It is stored mainly in the liver and skeletal muscles
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) galactose
(b) fructose
(c) maltose
(d) dextrin
Show Answer & Explanation
Answer: (c) maltose
Explanation:
1. Maltose is made of two glucose units
2. Galactose and fructose are monosaccharides, dextrin is an oligosaccharide mixture
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) C
(b) N
(c) S
(d) P
Show Answer & Explanation
Answer: (d) P
Explanation:
1. Proteins contain C, H, O and N, and S in some amino acids
2. Phosphorus is a feature of nucleic acids and phospholipids
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) starch
(b) glycogen
(c) wax
(d) glucose
Show Answer & Explanation
Answer: (c) wax
Explanation:
1. Wax is a lipid (ester of long-chain fatty acid and alcohol)
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Assertion (A): Most biomolecules found in the acid-insoluble fraction are macromolecules.
Reason (R): Most biomolecules in the acid-insoluble fraction have molecular weight more than 1000 Da.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. Macromolecules are defined by a molecular weight above about 1000 Da
2. The acid-insoluble pool contains such molecules
3. So R explains A
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) carbohydrate
(b) fats
(c) vitamins
(d) proteins
Show Answer & Explanation
Answer: (a) carbohydrate
Explanation:
1. Carbohydrates are oxidised fastest, so glucose gives quick energy
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) collagen
(b) myosin
(c) actin
(d) albumin
Show Answer & Explanation
Answer: (a) collagen
Explanation:
1. Collagen is the most abundant protein in animals; RuBisCO is the most abundant in the biosphere
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) sucrose
(b) starch
(c) glycogen
(d) cellulose
Show Answer & Explanation
Answer: (a) sucrose
Explanation:
1. Sucrose is a disaccharide of glucose and fructose
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) carbohydrate
(b) fats
(c) protein
(d) nucleic acid
Show Answer & Explanation
Answer: (c) protein
Explanation:
1. Feathers contain keratin and silk contains fibroin, both proteins
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) a pentose sugar
(b) a hexose sugar
(c) only glucose
(d) all of the above
Show Answer & Explanation
Answer: (d) all of the above
Explanation:
1. Monosaccharides include trioses, pentoses (ribose) and hexoses (glucose, fructose, galactose), so all statements hold
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Assertion (A): Lipids are not strictly macromolecules.
Reason (R): The molecular weight of lipids does not exceed 800 Da.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. Lipids are small molecules even though they appear in the acid-insoluble fraction
2. Their low weight is why they are not true macromolecules
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) maltose
(b) lactose
(c) trehalose
(d) galactose
Show Answer & Explanation
Answer: (c) trehalose
Explanation:
1. Trehalose is the blood sugar of insects, a disaccharide of two glucose units
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) carbohydrates
(b) proteins
(c) water
(d) fats
Show Answer & Explanation
Answer: (c) water
Explanation:
1. Water forms 70 to 90 percent of living cells
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) they give a definite shape to the cell
(b) they function as biocatalysts
(c) they yield energy
(d) they are stored food
Show Answer & Explanation
Answer: (b) they function as biocatalysts
Explanation:
1. Almost all enzymes are proteins, so proteins act as biocatalysts
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) a structure with two peptide bonds
(b) two amino acids linked by one peptide bond
(c) a bond between one amino acid and one peptide
(d) none of these
Show Answer & Explanation
Answer: (b) two amino acids linked by one peptide bond
Explanation:
1. A peptide bond joins the carboxyl group of one amino acid to the amino group of the next
2. Two amino acids need exactly one bond
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) glycine
(b) phenylalanine
(c) lysine
(d) methionine
Show Answer & Explanation
Answer: (a) glycine
Explanation:
1. Glycine is synthesised in the body
2. Phenylalanine and methionine must come from the diet
Teacher's Note:
1. Essential amino acids cannot be made by the body.
Assertion (A): GLUT-4 is an essential protein for the bioenergetics of the cell.
Reason (R): GLUT-4 enables glucose transport into the cell.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. Glucose is the fuel of respiration
2. GLUT-4 brings it inside the cell, so R explains A
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) chitin
(b) keratin
(c) both
(d) none
Show Answer & Explanation
Answer: (b) keratin
Explanation:
1. These structures are made of the fibrous protein keratin
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) polymer of amino acids
(b) polymer of fatty acids
(c) unsaturated fat
(d) polymer of glucose
Show Answer & Explanation
Answer: (d) polymer of glucose
Explanation:
1. Glycogen is a branched homopolymer of glucose
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) polymers of fatty acids
(b) polymers of amino acids
(c) polyhydroxy aldehydes or ketones and their derivatives
(d) none of these
Show Answer & Explanation
Answer: (c) polyhydroxy aldehydes or ketones and their derivatives
Explanation:
1. They are polyhydroxy aldehydes or ketones, or substances that give these on hydrolysis
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) glucose
(b) glycogen
(c) cellulose
(d) ATP
Show Answer & Explanation
Answer: (b) glycogen
Explanation:
1. Animals store carbohydrate as glycogen
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) protein
(b) fats
(c) vitamins
(d) glucose
Show Answer & Explanation
Answer: (b) fats
Explanation:
1. Fats give about 9 kcal/g against about 4 kcal/g for carbohydrates
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Assertion (A): Together with polysaccharides and polypeptides, nucleic acids make up the true macromolecular fraction of any living tissue.
Reason (R): Like polysaccharides and polypeptides, nucleic acids have molecular weight above 1000 Da.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. All three are large polymers
2. A high molecular weight is the reason they are called macromolecules
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) glucose in liver
(b) glycogen in muscles and spleen
(c) lactic acid in muscles
(d) glycogen in liver and muscles
Show Answer & Explanation
Answer: (d) glycogen in liver and muscles
Explanation:
1. Glycogen is the storage form, in liver and muscle
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) fats
(b) glycogen
(c) blood protein
(d) muscle protein
Show Answer & Explanation
Answer: (b) glycogen
Explanation:
1. Glycogen reserves are used first, then fats, and proteins last
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) sugars
(b) purines
(c) pyrimidines
(d) amino acids
Show Answer & Explanation
Answer: (d) amino acids
Explanation:
1. Proteins are polymers of amino acids
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
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FAQs
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