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Biomolecules Practice Questions

Class 11 · Biology · 2320 free MCQs with instant results and detailed explanations.

2320
Total
720
Easy
1133
Medium
467
Hard

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Topics in Biomolecules

Nucleic Acids 463
Lipids 459
Proteins 489
Carbohydrates 468
Enzymes 441

Sample Questions from Biomolecules

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
Which of the following is a monosaccharide?
A. Glucose
B. Sucrose
C. Starch
D. Cellulose
Show Answer & Explanation
Correct Answer: A
Glucose is a simple sugar and classified as a monosaccharide, while sucrose, starch, and cellulose are polysaccharides or disaccharides.
Q2
Easy
What is the primary function of carbohydrates in living organisms?
A. Energy storage
B. Genetic information
C. Catalysis
D. Insulation
Show Answer & Explanation
Correct Answer: A
Carbohydrates primarily serve as a source of energy for organisms, with some also playing roles in structure.
Q3
Easy
Which carbohydrate is known as blood sugar?
A. Fructose
B. Galactose
C. Glucose
D. Maltose
Show Answer & Explanation
Correct Answer: C
Glucose is commonly referred to as blood sugar, as it is a primary energy source in the bloodstream.
Q4
Medium
Which of the following is a disaccharide?
A. Glucose
B. Fructose
C. Sucrose
D. Galactose
Show Answer & Explanation
Correct Answer: C
Sucrose is a disaccharide made of glucose and fructose, while glucose, fructose, and galactose are all monosaccharides.
Q5
Medium
What type of bond joins monosaccharides in carbohydrates?
A. Peptide bonds
B. Glycosidic bonds
C. Hydrogen bonds
D. Ionic bonds
Show Answer & Explanation
Correct Answer: B
Monosaccharides are joined by glycosidic bonds to form disaccharides and polysaccharides.
Q6
Medium
Which carbohydrate is primarily used for energy storage in animals?
A. Cellulose
B. Starch
C. Glycogen
D. Chitin
Show Answer & Explanation
Correct Answer: C
Glycogen is the primary storage form of carbohydrates in animals, while starch serves this function in plants.
Q7
Medium
Which of the following polysaccharides is not digestible by humans?
A. Starch
B. Glycogen
C. Cellulose
D. Maltose
Show Answer & Explanation
Correct Answer: C
Humans lack the enzyme cellulase, making cellulose indigestible, while starch, glycogen, and maltose can be digested.
Q8
Hard
Which of the following carbohydrates contains the highest number of glucose units?
A. Starch
B. Cellulose
C. Glycogen
D. Sucrose
Show Answer & Explanation
Correct Answer: A
Starch is a polysaccharide made up of numerous glucose units linked together, making it the carbohydrate with the highest number of glucose units.
Q9
Hard
What is the primary structural difference between amylose and amylopectin?
A. Presence of glucose units
B. Branching in structure
C. Molecular weight
D. Solubility in water
Show Answer & Explanation
Correct Answer: B
Amylose is unbranched while amylopectin has a branched structure due to the presence of (1→6) glycosidic bonds.
Q10
Hard
Which of the following is a characteristic feature of cellulose?
A. It is digestible by humans.
B. It has a straight-chain structure.
C. It is soluble in water.
D. It is composed of fructose units.
Show Answer & Explanation
Correct Answer: B
Cellulose has a straight-chain structure made up of β-glucose units linked by β(1→4) glycosidic bonds, making it indigestible for humans.

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Biomolecules — Class 11 Biology Practice Questions Online

This page contains 2320 practice MCQs for the chapter Biomolecules in Class 11 Biology. The questions are organized by difficulty — 720 easy, 1133 medium, 467 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.