NEET Chemistry Biomolecules MCQs Set A

Question: Which of the following is a reducing sugar?

• a) Glycogen
• b) Maltose
• c) Sucrose
• d) Starch

Answer: Maltose

Question: Glucose reacts with HNO₃ to form

• a) Gluconic acid
• b) Saccharic acid
• c) Sulphuric acid
• d) Glyconic acid

Answer: Saccharic acid

Question: Carbohydrate is a condensation polymer of

• a) Amino acid
• b) Nucleotides
• c) Styrene
• d) Simple sugars

Answer: Simple sugars

Question:  On reaction with red P + HI, glucose forms

• a) n-pentane
• b) n-butane 
• c) n-hexane 
• d) n-heptane

Answer:  n-hexane 

Question: Which of the following carbohydrate cannot be digested by human body?

• a) Starch
• b) Cellulose
• c) Glycogen
• d) All of these

Answer: Cellulose

Question: Which of the following is an essential amino acid?

• a) Asparagine
• b) Glutamine
• c) Histidine
• d) Alanine

Answer: Histidine

Question: Deficiency of which of the vitamin causes rickets?

• a) Vitamin-D
• b) Vitamin-C
• c) Vitamin-B₁₂
• d) Vitamin-E

Answer: Vitamin-D

Question: Which of the following amino acid is optically inactive?

• a) Lysine
• b) Glutamine
• c) Serine
• d) Glycine

Answer: Glycine

Question: Rice is deficient in

• a) Lysine
• b) Leucine
• c) Glycine
• d) Alanine

Answer: Lysine

Question: Which of the following is water soluble vitamin?

• a) Vitamin-C
• b) Vitamin-D
• c) Vitamin-A
• d) Vitamin-K

Answer: Vitamin-C

Question: Glycosidic linkage is present in

• a) Proteins
• b) Lipids
• c) Carbohydrates
• d) Nucleic acids

Answer: Carbohydrates

Question: In which form carbohydrate is stored inside the human body?

• a) Cellulose
• b) Sucrose
• c) Maltose
• d) Glycogen

Answer: Glycogen

Question: Which of the following is basic amino acid?

• a) Lysine
• b) Valine
• c) Aspartic acid
• d) Glycine

Answer: Lysine

Question:  α–D (+) Glucose and β-D(+) Glucose are

• a) Anomers
• b) Epimers
• c) Enantiomers
• d) All of these

Answer: Anomers

Question: Which of the following disaccharide consists only of glucose unit?

• a) Sucrose
• b) Maltose
• c) Lactose
• d) All of these

Answer: Maltose

Question: Which of the following disaccharide is called invert sugar?

• a) Lactose
• b) Maltose
• c) Sucrose
• d) All of these

Answer: Sucrose

Question: Which of the following component in starch is water insoluble?

• a) Amylose
• b) Glycogen
• c) Amylopectin
• d) Cellulose

Answer: Amylopectin

Question: Which of the following carbohydrate is known as animal starch?

• a) Cellulose
• b) Amylose
• c) Glycogen
• d) Maltose

Answer: Glycogen

Question: Antibodies are known as

• a) Carbohydrates
• b) Proteins
• c) Lipids
• d) Enzymes

Answer: Proteins

Question: The helical structure of proteins is stabilised by

• a) Peptide bonds
• b) Hydrogen bonds
• c) Dipeptide bonds
• d) van der Waals’ forces

Answer: Hydrogen bonds

Question: Tertiary structures of proteins is given as

• a) α-helix 
• b) Fibrous
• c) β-pleated
• d) All of these

Answer: Fibrous

Question: Albumin is a type of

• a) Fibrous protein
• b) Globular protein
• c) Lipid
• d) Carbohydrate

Answer: Globular protein

Question: Glucose when reacted with acetic anhydride forms

• a) Diacetate
• b) Hexa-acetate
• c) Pentacetate
• d) Tetra-acetate

Answer: Pentacetate

Question: Co is present in which of the following vitamin?

• a) Vitamin-A
• b) Vitamin-C
• c) Vitamin-B₁₂
• d) Vitamin-D

Answer:  Vitamin-B₁₂

Question: Complementary bases present in DNA are

• a) Uracil & Adenine : Cytosine & Guanine
• b) Thymine & Adenine : Guanine & Cytosine
• c) Adenine & Thymine : Guanine & Uracil
• d) Adenine & Guanine : Thymine & Cytosine

Answer: Thymine & Adenine : Guanine & Cytosine

Question: Choose the correct statement about isoelectric point

• a) If pH > isoelectric point amino acid will move towards cathode
• b) At this point amino acid is present in the form of Zwitter ion
• c) If pH < isoelectric point, amino acid will move towards anode
• d) At this point amino acids are basic in nature

Answer: At this point amino acid is present in the form of Zwitter ion

Question: The relation between nucleotide triplets and the amino acids is called as

• a) Gene
• b) Nucleoside
• c) Genetic code
• d) Gene pool

Answer: Genetic code

Question: Amino acids are known to be building blocks of

• a) Proteins
• b) Nucleic acids
• c) Carbohydrates
• d) Vitamins

Answer: Proteins

Question: Nucleotides contain

• a) A phosphoric acid group
• b) A nitrogenous base
• c) A pentose sugar
• d) All of these

Answer: All of these

Question: DNA-directed synthesis of proteins occurs through

• a) Transcription
• b) Translation
• c) Transformation
• d) Both (1) & (2)

Answer: Both (1) & (2)

More Questions....................................

Question: Correct order of calorific value is

• a) Carbohydrates > Fats > Porteins
• b) Fats > Carbohydrates > Proteins
• c) Proteins > Carbohydrates > Fats
• d) Fats > Proteins > Carbohydrates

Answer: Fats > Carbohydrates > Proteins

Question: The best solvent for removing butter stain from cloth is

• a) CHCl₃   
• b) C₂H₅OH
• c) C₂H₅OC₂H₅ 
• d) H₂O

Answer: C₂H₅OC₂H₅ 

Question: The commonest disaccharide has molecular formula

• a) C₁₂H₂₂O₁₁
• b) C₁₀H₂₀O₁₀  
• c) C₁₀H₁₈O₉ 
• d) C₁₀H₃₂O₁₁

Answer:  C₁₂H₂₂O₁₁

Question: Mutarotation is not seen in

• a) Sucrose
• b) D-Glucose
• c) L-Glucose
• d) All of these

Answer: Sucrose

Question: Mutarotation in aqueous solution is shown by

• a) Glycogen
• b) Sucrose
• c) Cellulose
• d) Maltose

Answer: Maltose

Question: The acid which shows salt-like character in aqueous solution is

• a) Acetic acid
• b) α-aminoethanoic acid
• c) Benzoic acid
• d) Formic acid

Answer:  α-aminoethanoic acid

Question: Branched chain structure is shown by

• a) Amylopectin
• b) Cellulose
• c) Amylose
• d) Nylon

Answer: Amylopectin

Question: The number of amino acids required to form a tripeptide bond are

• a) Seven
• b) Two
• c) Six
• d) Four

Answer: Four

Question: Glucose does not give

• a) Schiff’s test
• b) Hydrogensulphite addition product with NaHSO₃
• c) 2, 4 DNP test
• d) All of these

Answer: All of these

Question: The two cyclic hemiacetal forms of glucose differing only in the configuration of the hydroxyl group at C-1 are called

• a) Anomers
• b) Enantiomers
• c) Epimers
• d) Metamers

Answer: Anomers

Question: Glucose reacts with HCN to give

• a) Saccharic acid
• b) Cyanohydrin
• c) n-hexane
• d) Gluconic

Answer: Cyanohydrin

Question: Keratin in skin, hair, nails and wool is a

• a) Fibrous protein
• b) α-helix type
• c) Glubular protein
• d) None of these

Answer: Fibrous protein

Question: Cellulose is soluble in

• a) Water
• b) Organic solvents
• c) Ammonical cupric hydroxide solution
• d) All of these

Answer: Ammonical cupric hydroxide solution

Question: Which types of proteins undergo denaturation?

• a) α-helix type 
• b) Globular
• c) β-pleated types
• d) Fibrous

Answer: Globular

Question: Cane sugar on hydrolysis gives

• a) Fructose + Glucose
• b) Fructose + Fructose
• c) Glucose + Glucose
• d) Glucose + Lactose

Answer:   Fructose + Glucose

Question: Which is correct statement?

• a) Starch is polymer of α-glucose
• b) Amylose is a component of cellulose
• c) Proteins are composed of only one type of amino acids
• d) In cyclic structure of furanose, there are five carbons and one oxygen atom

Answer:  Starch is polymer of α-glucose

Question: Which of the following is not an amino acid?

• a) Glycine
• b) Alanine
• c) Histidine
• d) Benzidine

Answer: Benzidine

Question: Enzymes in the living systems

• a) Provide energy
• b) Provide immunity
• c) Transport oxygen
• d) Catalyze biological reactions

Answer: Catalyze biological reactions

Question:

• a) Maltose, D-Glucose
• b) Lactose, D-Glucose
• c) Sucrose, D-Glucose
• d) Maltose, fructose

Answer: Maltose, D-Glucose

Question: In the double helix structure of DNA, the base pairs are

• a) Part of the backbone structure
• b) Inside the helix
• c) Outside the helix
• d) Bonded with covalent bond

Answer: Inside the helix

Question:  Glucose when oxidised with conc. HNO₃ then the product formed is

• a) HOOC(CHOH)₄COOH     
• b) HOCH₂(CHOH)₄COOH
• c) H₃CCH₂CH₂CH₂CH₂CH₃   
• d) HOCH₂(CHOH)₄CH = NOH

Answer:  HOOC(CHOH)₄COOH     

Question: Which pair is an example of anomers?

• a) α-D-glucose and β-D-glucose 
• b) Glucose and mannose
• c) Glucose and fructose
• d) Fructose and sugar

Answer:  α-D-glucose and β-D-glucose 

Question: The reagent which may be used to distinguish between cane sugar and glucose solution is

• a) Molisch’s reagent
• b) Iodine solution
• c) Baeyer’s reagent
• d) Fehling’s solution

Answer: Fehling’s solution

Question:

pK_a of the sites α,β and γ are 10.79, 2.18 and 8.95. Isoelectric point will be

• a) 9.87
• b) 5.07
• c) 6.5
• d) 2.18

Answer: 9.87

Question: The reagent which forms crystalline osazone derivative when reacted with glucose is

• a) Fehling solution 
• b) Phenylhydrazine
• c) Benedicts solution 
• d) Hydroxylamine

Answer: Phenylhydrazine

Question:  Lactic acid on oxidation by alkaline KMnO₄ gives

• a) Tartaric acid
• b) Cinnamic acid
• c) Propionic acid
• d) Pyruvic acid

Answer: Pyruvic acid

Question: Glucose does not react with

• a) NH₂OH
• b) C₆H₅NHNH₂
• c) NaHSO₃
• d) HCN

Answer:  NaHSO₃

Question: Vitamin A is called

• a) Ascorbic acid
• b) Retinol
• c) Calciferol
• d) Tocopherol

Answer: Retinol

Question: Select the correct statement

• a) For exergonic reactions ΔG > 0
• b) ATP undergoes a three step hydrolysis
• c) Conversion of ATP to ADP is highly endergonic reaction
• d) Dark reactions do not proceed even on being coupled with hydrolysis of ATP

Answer: ATP undergoes a three step hydrolysis

Question: A polypeptide on complete hydrolysis gives three amino acids. How many sequences are possible for that polypeptide?

• a) 1
• b) 3
• c) 6
• d) 9

Answer: 6