JEE Chemistry Biomolecules MCQs Set A

Question. Which one of the following compounds is different from the rest?
(a) Glucose
(b) Maltose
(c) Sucrose
(d) Lactose

Answer: A

Question. The two functional groups present in a typical carbohydrate are
(a) – OH and – CHO
(b) – CHO and – COOH
(c) > C = O and – OH
(d) – OH and – COOH

Answer: A

Question. When glucose reacts with bromine water, the main product is
(a) gluconic acid
(b) saccharic acid
(c) glyceraldehyde
(d) acetic acid

Answer: A

Question. Glucose does not react with
(a) NaHSO₃
(b) H₂NOH
(c) HI
(d) None of these

Answer: A

Question. Glucose reacts with acetic anhydride to form
(a) penta-acetate
(b) monoacetate
(c) tetra-acetate
(d) hexa-acetate

Answer: A

Question. Reduction of glucose by HI suggest that
(a) six carbon atoms are arranged in straight chain
(b) cyclic structure of glucose
(c) presence of –CHO group
(d) presence of OH groups

Answer: A

Question. The reaction of glucose with red P + HI is called
(a) Reduction
(b) Reformatsky reaction
(c) Sandmeyer’s reaction
(d) Gattermann’s reaction

Answer: A

Question. Which of the following reactions of glucose can be explained only by its cyclic structure?
(a) Pentaacetate of glucose does not react with hydroxylamine
(b) Glucose is oxidised by nitric acid to gluconic acid
(c) Glucose reacts with hydroxylamine to form an oxime
(d) Glucose forms pentaacetate

Answer: A

Question. Isomerization of glucose produces
(a) fructose
(b) allose
(c) galactose
(d) mannose

Answer: A

Question. A solution of D-glucose in water rotates the plane polarised light
(a) to the right
(b) to either side
(c) to the left
(d) None of these

Answer: A

Question. Which of the following carbohydrates are branched polymer of glucose?
(i) Amylose   (ii) Amylopectin
(iii) Cellulose (iv) Glycogen
(a) (ii) and (iv)
(b) (i), (ii) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)

Answer: A

Question. Which of the following reagent cannot distinguish between glucose and fructose?
(a) Tollen’s reagent
(b) All of these
(c) Fehling’s solution
(d) Benedict’s solution

Answer: A

Question. Maltose and glucose are
(a) reducing sugar
(b) oxidising sugar
(c) first is oxidising and second is reducing sugar
(d) both are non-reducing sugar

Answer: A

Question. Choose the correct relationship for glucose and fructose
(a) these are functional isomers
(b) these are chain isomers
(c) these are position isomers
(d) All of these

Answer: A

Question. The pair of compounds in which both the compounds give positive test with Tollen’s reagent is
(a) Glucose and Fructose
(b) Acetophenone and Hexanal
(c) Fructose and Sucrose
(d) Glucose and Sucrose

Answer: A

Question. Biomolecules are
(a) carbohydrates, proteins and fats
(b) alcohols and phenols
(c) acids and esters
(d) aldehydes and ketones

Answer: A

Question. Which of the following is a disaccharide ?
(a) Lactose
(b) Cellulose
(c) Starch
(d) Fructose

Answer: A

Question.  The sugar that is characteristic of milk is
(a) lactose
(b) maltose
(c) ribose
(d) galactose

Answer: A

Question. Which one is a disaccharide ?
(a) Sucrose
(b) Fructose
(c) Glucose
(d) Xylose

Answer: A

Question. Which of the following monosaccharide is pentose ?
(a) Arabinose
(b) Glucose
(c) Fructose
(d) Galactose

Answer: A

Question. The commonest disaccharide has the molecular formula
(a) C₁₂H₂₂O₁₁
(b) C₁₀H₂₀O₁₀
(c) C₁₀H₁₈O₉
(d) None of these

Answer: A

Question. Monosaccharides usually contains ... carbon atoms.
(a) C₃ to C₁₀
(b) C₄ to C₁₀
(c) C₁ to C₆
(d) None of these

Answer: A

Question. Which one of the following compounds is found abudnantly in nature?
(a) Cellulose
(b) Starch
(c) Fructose
(d) Glucose

Answer: A

Question. A carbohydrate that cannot be hydrolysed into simpler units is called
(a) monosaccharides
(b) trisaccharides
(c) polysaccharides
(d) disachharides

Answer: A

Question. Which of the following statements is incorrect ?
(a) Cellulose and sucrose are polysaccharide.
(b) Maltose gives two molecules of glucose only
(c) Polysaccharides are not sweet in taste
(d) Polysaccharides are also known as non-sugars

Answer: A

Question. Reducing sugars reduce
(a) both
(b) only Fehling’s solution
(c) only Tollen’s solution
(d) None of these

Answer: A

Question. Which among the following is the simplest sugar?
(a) Glucose
(b) Cellulose
(c) Starch
(d) None of these

Answer: A

Question. Glucose can’t be classified as
(a) oligosaccharide
(b) carbohydrate
(c) hexose
(d) aldose

Answer: A

Question. Which of the following gives positive Fehling solution test?
(a) Glucose
(b) Protein
(c) Sucrose
(d) Fats

Answer: A

Question. Which of the following statements is incorrect regarding glucose?
(a) It is the least abundant organic compound on earth.
(b) It is monomer of cellulose
(c) It is also known as dextrose
(d) It is an aldohexose

Answer: A

Question. Glucose gives silver mirror test with Tollen’s reagent. It shows the presence of
(a) aldehyde group
(b) alcoholic group
(c) acidic group
(d) ketonic group

Answer: A

Question. The symbols D and L represents
(a) the relative configuration of a particular stereoisomer.
(b) the dextrorotatory nature of molecule
(c) the levorotatory nature of molecule
(d) the optical activity of compounds.

Answer: A

Question. The function of glucose is to
(a) provides energy
(b) prevent diseases
(c) promote growth
(d) perform all above

Answer: A

Question. The letter D and L in carbohydrates represent
(a) its configuration
(b) its mutarotation
(c) its optical rotation
(d) its direct synthesis

Answer: A

Question. Which of the following statement is correct about fructose?
(a) It exists in the two cyclic forms which is obtained by the addition of OH at C-5 to the >C=O group
(b) It exists as six membered ring
(c) It is named as furanose as it contain one oxygen and six carbon atom
(d) It is dextrorotatory compound

Answer: A

Question. Fructose is
(a) a hemiketal
(b) a hemiacetal
(c) an acetal
(d) a ketal

Answer: A

Question. The sugar present in fruits is
(a) fructose
(b) sucrose
(c) glucose
(d) galactose

Answer: A

Question. The sugar present in honey is
(a) fructose
(b) sucrose
(c) glucose
(d) maltose

Answer: A

Question. Which of the following is the sweetest sugar?
(a) Fructose
(b) Sucrose
(c) Glucose
(d) Maltose

Answer: A

Question. Cellulose is a polymer of
(a) Glucose
(b) Ribose
(c) Sucrose
(d) Fructose

Answer: A

Question. Sucrose on hydrolysis gives
(a) glucose + fructose
(b) fructose + fructose
(c) fructose+ribose
(d) glucose+glucose

Answer: A

Question. The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA?
(a) 2nd
(b) 4th
(c) 1st
(d) 3rd

Answer: A

Question. Carbohydrates are stored in the body as
(a) glycogen
(b) starch
(c) sugars
(d) glucose

Answer: A

Question. A carbohydrate insoluble in water is
(a) cellulose
(b) glucose
(c) fructose
(d) sucrose

Answer: A

Question. Which of the following carbohydrate does not correspond to the general formula C_x(H₂O)_y ?
(a) 2-Deoxyribose
(b) Arabinose
(c) Glucose
(d) Fructose

Answer: A

Question. Which of the following monosaccharides are present as five membered cyclic structure (furanose structure)?
(i) Ribose      (ii) Glucose
(iii) Fructose (iv) Galactose
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)

Answer: A

Question. Invert sugar is
(a) equimolecular mixture of glucose and fructose
(b) chemically inactive form of sugar
(c) mixture of glucose and sucrose
(d) a variety of cane sugar

Answer: A

Question. Which one of the following does not exhibit the phenomenon of mutarotation ?
(a) (+) – Sucrose
(b) (+) – Maltose
(c) (+) – Lactose
(d) (–) – Fructose

Answer: A

Question. Sucrose which is dextrorotatory in nature after hydrolysis gives glucose and fructose, among which
(i) Glucose is laevorotatory and fructose is dextrorotatory.
(ii) Glucose is dextrorotatory and fructose is laevorotatory
(iii) The mixture is laevorotatory.
(iv) Both are dextrorotatory.
(a) (ii) and (iii)
(b) (iii) only
(c) (i) and (iii)
(d) (iii) and (iv)

Answer: A

Question. Which of the following is also known as animal starch?
(a) Glycogen
(b) Cellulose
(c) Glycine
(d) Amylose

Answer: A

Question. Select the uses of carbohydrates
(a) All of the above
(b) They are used in furniture, cotton fibre, lacquers
(c) These are used as storage molecules
(d) Honey is used as instant source of energy by vaids in ayurvedic system of medicine

Answer: A

Question. The number of essential amino acids in man is
(a) 10
(b) 20
(c) 8
(d) 18

Answer: A

Question. Amino acids are the building blocks of
(a) proteins
(b) carbohydrates
(c) fats
(d) vitamins

Answer: A

Question. Which one of the amino acids can be synthesised in the body?
(a) Alanine
(b) Valine
(c) Lysine
(d) Histidine

Answer: A

Question. Two functional group that are present in all amino acids are the
(a) carboxyl, amino
(b) hydroxy, amine
(c) hydroxy, amide
(d) carboxyl, amide

Answer: A

Question. Which of the following is not an optically active amino acid?
(a) Glycine
(b) Valine
(c) Leucine
(d) Arginine

Answer: A

Question. In aqueous solution, an amino acid exists as
(a) zwitter ion
(b) anion
(c) cation
(d) dianion

Answer: A

Question. Which one of the following statements is correct?
(a) All amino acids except glycine are optically active
(b) All amino acids except glutamic acids are optically active
(c) All amino acids are optically active
(d) All amino acids except lysine are optically active

Answer: A

Question. Which of the following molecules is capable of forming Zwitter ion?
(a) NH₂CH₂COOH
(b) CH₃CH₂NH₂
(c) CH₃CH₂COOH
(d) All of these

Answer: A

Question. Simplest proteins has one peptide linkage. It is
(a) dipeptide
(b) oligopeptide
(c) tripeptide
(d) tetrapeptide

Answer: A

Question. A nanopeptide contain how many peptide bond
(a) 8
(b) 7
(c) 9
(d) 10

Answer: A