JEE Chemistry Biomolecules MCQs Set 13

Chemistry Objective Questions and Answers: Biomolecules

Explore reliable objective questions for Biomolecules tailored for JEE learners. Utilizing these Chemistry multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Download Biomolecules MCQs with Answers

Access the complete set of multiple-choice questions for Biomolecules below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official JEE textbooks.

Multiple Choice Questions

Question 1: Which is used in motion picture films?
(a) cellulose acetate
(b) glucose acetate
(c) starch acetate
(d) sucrose acetate
Show Answer & Explanation

Answer: (a) cellulose acetate

Explanation:
1. Cellulose acetate is a non-inflammable film base.

Teacher's Note:
1. Eliminate options by checking functional groups on both sides of the reaction.
2. Only one option will have the correct functional group and carbon skeleton.

Question 2: Glucose reacts with acetic anhydride to form
(a) mono-acetate
(b) tetra-acetate
(c) penta-acetate
(d) hexa-acetate
Show Answer & Explanation

Answer: (c) penta-acetate

Explanation:
1. Glucose has five hydroxyl groups, all acetylated.

Teacher's Note:
1. Revise the physical properties such as hydrogen bonding and boiling points together with the chemistry.
2. Compare similar compounds in pairs when you are asked to rank them.

Question 3: Which of the following does not show any reducing test of an aldehyde?
(a) sucrose
(b) fructose
(c) maltose
(d) lactose
Show Answer & Explanation

Answer: (a) sucrose

Explanation:
1. Sucrose has no free carbonyl or hemiacetal group.

Teacher's Note:
1. Learn the reactivity order of acid derivatives: acyl chloride, anhydride, ester, amide.
2. Most questions of this type are solved by recalling the standard reagent and product pair.

Question 4: When amylases catalyse the hydrolysis of starch, the final product is chiefly
(a) cellobiose
(b) glucose
(c) maltose
(d) sucrose
Show Answer & Explanation

Answer: (c) maltose

Explanation:
1. Alpha-amylase gives maltose.

Teacher's Note:
1. Always link acid strength to the stability of the carboxylate ion.
2. Electron-withdrawing groups increase acidity and electron-donating groups decrease it.

Question 5: Galactose is converted into glucose in
(a) the mouth
(b) the stomach
(c) the liver
(d) the intestine
Show Answer & Explanation

Answer: (c) the liver

Explanation:
1. The liver carries out the epimerisation.

Teacher's Note:
1. Note the name reaction and write its equation once in your notebook.
2. Such one-step recall questions are common in the JEE and NEET style papers.

Question 6: Which among the following is the simplest?
(a) glucose
(b) cellulose
(c) starch
(d) none of these
Show Answer & Explanation

Answer: (a) glucose

Explanation:
1. Glucose is a monosaccharide and the other two are polymers.

Teacher's Note:
1. Count carbons before and after the reaction to avoid mistakes in chain-length changes.
2. Check whether the reagent is a reducing, oxidising or dehydrating agent before choosing the product.

Question 7: The indigestible carbohydrate which is also a constituent of our diet is
(a) cellulose
(b) galactose
(c) maltose
(d) starch
Show Answer & Explanation

Answer: (a) cellulose

Explanation:
1. Humans lack the enzyme to hydrolyse beta-1,4 linkages, but cellulose acts as roughage.

Teacher's Note:
1. Eliminate options by checking functional groups on both sides of the reaction.
2. Only one option will have the correct functional group and carbon skeleton.

Question 8: Starch is converted into maltose by
(a) maltase
(b) invertase
(c) zymase
(d) diastase
Show Answer & Explanation

Answer: (d) diastase

Explanation:
1. Diastase is an amylase.

Teacher's Note:
1. Revise the physical properties such as hydrogen bonding and boiling points together with the chemistry.
2. Compare similar compounds in pairs when you are asked to rank them.

Question 9: The disaccharide present in milk is
(a) maltose
(b) lactose
(c) sucrose
(d) none of these
Show Answer & Explanation

Answer: (b) lactose

Explanation:
1. Lactose is milk sugar.

Teacher's Note:
1. Learn the reactivity order of acid derivatives: acyl chloride, anhydride, ester, amide.
2. Most questions of this type are solved by recalling the standard reagent and product pair.

Question 10: Carbohydrates are used by the body mainly
(a) for obtaining vitamins
(b) as a source of energy
(c) for all developmental needs
(d) for building muscles
Show Answer & Explanation

Answer: (b) as a source of energy

Explanation:
1. Oxidation of glucose releases energy.

Teacher's Note:
1. Always link acid strength to the stability of the carboxylate ion.
2. Electron-withdrawing groups increase acidity and electron-donating groups decrease it.

Question 11: In the viscose process, the solvent for cellulose consists of
(a) ether and alcohol
(b) copper sulphate and ammonia
(c) sodium hydroxide and carbon disulphide
(d) acetic acid and acetic anhydride
Show Answer & Explanation

Answer: (c) sodium hydroxide and carbon disulphide

Explanation:
1. Cellulose with NaOH and CS2 gives soluble cellulose xanthate (viscose).

Teacher's Note:
1. Note the name reaction and write its equation once in your notebook.
2. Such one-step recall questions are common in the JEE and NEET style papers.

Question 12: Which of the following does not reduce Benedict's solution?
(a) sucrose
(b) an aldehyde
(c) fructose
(d) cellobiose
Show Answer & Explanation

Answer: (a) sucrose

Explanation:
1. Sucrose is non-reducing.
2. Fructose and cellobiose are reducing sugars.

Teacher's Note:
1. Count carbons before and after the reaction to avoid mistakes in chain-length changes.
2. Check whether the reagent is a reducing, oxidising or dehydrating agent before choosing the product.

Question 13: In polysaccharides the linkage connecting monosaccharide units is called
(a) a glycoside linkage
(b) a nucleoside linkage
(c) a glycogen linkage
(d) a peptide linkage
Show Answer & Explanation

Answer: (a) a glycoside linkage

Explanation:
1. The acetal oxygen between two sugar units is a glycosidic link.

Teacher's Note:
1. Eliminate options by checking functional groups on both sides of the reaction.
2. Only one option will have the correct functional group and carbon skeleton.

Question 14: Blood sugar is the same as
(a) glucose
(b) galactose
(c) glycogen
(d) fructose
Show Answer & Explanation

Answer: (a) glucose

Explanation:
1. Blood sugar is glucose.

Teacher's Note:
1. Revise the physical properties such as hydrogen bonding and boiling points together with the chemistry.
2. Compare similar compounds in pairs when you are asked to rank them.

Question 15: Glucose has the functional group(s)
(a) aldehydic
(b) aldehydic and alcoholic
(c) alcoholic
(d) ketonic and alcoholic
Show Answer & Explanation

Answer: (b) aldehydic and alcoholic

Explanation:
1. Glucose has one -CHO and five -OH groups.

Teacher's Note:
1. Learn the reactivity order of acid derivatives: acyl chloride, anhydride, ester, amide.
2. Most questions of this type are solved by recalling the standard reagent and product pair.

Question 16: Which of the following is an aldohexose?
(a) cellulose
(b) sucrose
(c) glucose
(d) raffinose
Show Answer & Explanation

Answer: (c) glucose

Explanation:
1. Glucose is a six-carbon aldose.

Teacher's Note:
1. Always link acid strength to the stability of the carboxylate ion.
2. Electron-withdrawing groups increase acidity and electron-donating groups decrease it.

Question 17: An invert sugar is
(a) isorotatory
(b) dextrorotatory
(c) laevorotatory
(d) optically inactive
Show Answer & Explanation

Answer: (c) laevorotatory

Explanation:
1. The equimolar glucose and fructose mixture from sucrose rotates the plane of light to the left.

Teacher's Note:
1. Note the name reaction and write its equation once in your notebook.
2. Such one-step recall questions are common in the JEE and NEET style papers.

Question 18: Which of the following is the correct statement?
(a) troleins are amino acids
(b) alpha-hydrogen is present in fructose
(c) starch is a polymer of alpha-glucose
(d) amylose is a compound of cellulose
Show Answer & Explanation

Answer: (c) starch is a polymer of alpha-glucose

Explanation:
1. Starch (amylose and amylopectin) is made of alpha-D-glucose units.

Teacher's Note:
1. Count carbons before and after the reaction to avoid mistakes in chain-length changes.
2. Check whether the reagent is a reducing, oxidising or dehydrating agent before choosing the product.

Question 19: Which of the following is an aldohexose?
(a) cellulose
(b) sucrose
(c) galactose
(d) raffinose
Show Answer & Explanation

Answer: (c) galactose

Explanation:
1. Galactose is a six-carbon aldose.

Teacher's Note:
1. Eliminate options by checking functional groups on both sides of the reaction.
2. Only one option will have the correct functional group and carbon skeleton.

Question 20: The ultimate product of the hydrolysis of starch is
(a) fructose
(b) glucose
(c) sucrose
(d) none of these
Show Answer & Explanation

Answer: (b) glucose

Explanation:
1. Starch gives dextrins, then maltose and finally glucose.

Teacher's Note:
1. Revise the physical properties such as hydrogen bonding and boiling points together with the chemistry.
2. Compare similar compounds in pairs when you are asked to rank them.

Question 21: Raffinose is
(a) a trisaccharide
(b) a monosaccharide
(c) a disaccharide
(d) none of these
Show Answer & Explanation

Answer: (a) a trisaccharide

Explanation:
1. Raffinose is made of galactose, glucose and fructose.

Teacher's Note:
1. Learn the reactivity order of acid derivatives: acyl chloride, anhydride, ester, amide.
2. Most questions of this type are solved by recalling the standard reagent and product pair.

Question 22: A sugar that is not a disaccharide, among the following, is
(a) lactose
(b) galactose
(c) sucrose
(d) maltose
Show Answer & Explanation

Answer: (b) galactose

Explanation:
1. Galactose is a monosaccharide.

Teacher's Note:
1. Always link acid strength to the stability of the carboxylate ion.
2. Electron-withdrawing groups increase acidity and electron-donating groups decrease it.

Question 23: To detect reducing and non-reducing sugars, which of the following tests is used?
(a) Molisch test
(b) Biuret test
(c) Fehling's test
(d) Millon's test
Show Answer & Explanation

Answer: (a) Molisch test

Explanation:
1. Molisch's test (alpha-naphthol and conc. H2SO4) is a general test for all carbohydrates.
2. Fehling's test detects only reducing sugars.

Teacher's Note:
1. Note the name reaction and write its equation once in your notebook.
2. Such one-step recall questions are common in the JEE and NEET style papers.

Question 24: Which of the following is a disaccharide?
(a) glucose
(b) ribulose
(c) lactose
(d) arabinose
Show Answer & Explanation

Answer: (c) lactose

Explanation:
1. Lactose consists of galactose and glucose.

Teacher's Note:
1. Count carbons before and after the reaction to avoid mistakes in chain-length changes.
2. Check whether the reagent is a reducing, oxidising or dehydrating agent before choosing the product.

Question 25: On heating glucose with Fehling's solution we get a precipitate whose colour is
(a) yellow
(b) red
(c) black
(d) white
Show Answer & Explanation

Answer: (b) red

Explanation:
1. Cu2+ is reduced to red Cu2O.

Teacher's Note:
1. Eliminate options by checking functional groups on both sides of the reaction.
2. Only one option will have the correct functional group and carbon skeleton.

Question 26: Glycolysis is
(a) conversion of glucose to haem
(b) oxidation of glucose to glutamate
(c) conversion of pyruvate to citrate
(d) oxidation of glucose to pyruvate
Show Answer & Explanation

Answer: (d) oxidation of glucose to pyruvate

Explanation:
1. Glycolysis breaks glucose down to two molecules of pyruvate.

Teacher's Note:
1. Revise the physical properties such as hydrogen bonding and boiling points together with the chemistry.
2. Compare similar compounds in pairs when you are asked to rank them.

Question 27: Which of the following is an example of a ketohexose?
(a) mannose
(b) galactose
(c) maltose
(d) fructose
Show Answer & Explanation

Answer: (d) fructose

Explanation:
1. Fructose has a keto group and six carbons.

Teacher's Note:
1. Learn the reactivity order of acid derivatives: acyl chloride, anhydride, ester, amide.
2. Most questions of this type are solved by recalling the standard reagent and product pair.

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