Biomolecules Class 12 MCQ with Answers

In Class 12 Chemistry, this topic is very important for both board exams and competitive exams like NEET and JEE. To help students revise and practice, teachers suggest solving biomolecules class 12 mcqs because they cover important concepts in a simple and direct way. Practicing biomolecules mcqs class 12 gives clarity about carbohydrates, proteins, nucleic acids, vitamins and enzymes.

These mcqs on biomolecules class 12 are designed as per the CBSE Class 12 Chemistry Syllabus and are also linked with NCERT Solutions for Class 12 Chemistry. Many students also search for mcqs on biomolecules chemistry class 12 pdf to download and practice offline. Such question sets test both memory and understanding level. When students regularly solve biomolecules mcqs class 12, they improve their problem-solving speed and confidence in exams.

This collection of MCQs is prepared in a very simple language for easy reading. The MCQs questions are based on key topics given in NCERT Solutions and follow CBSE Board exam style. By using this resource, students will not only cover important points but also reduce exam stress.

Biomolecules Class 12 MCQ with Answers

Ques: Which of the following is a disaccharide?

• Glucose
• Fructose
• Sucrose
• Galactose

Answer: Sucrose

Ques: The basic unit of polysaccharides is:

• Monosaccharides
• Disaccharides
• Amino acids
• Nucleotides

Answer: Monosaccharides

Ques: Starch is a polymer of:

• Glucose
• Fructose
• Ribose
• Galactose

Answer: Glucose

Ques: Cellulose is not digested in humans because:

• It is water insoluble
• It lacks nitrogen
• Humans lack cellulase enzyme
• It is crystalline

Answer: Humans lack cellulase enzyme

Ques: Which sugar is known as fruit sugar?

• Glucose
• Fructose
• Maltose
• Lactose

Answer: Fructose

Ques: Building blocks of proteins are:

• Carbohydrates
• Fatty acids
• Amino acids
• Nucleotides

Answer: Amino acids

Ques: Which bond joins amino acids in proteins?

• Hydrogen bond
• Peptide bond
• Glycosidic bond
• Phosphodiester bond

Answer: Peptide bond

Ques: Which amino acid is essential for humans?

• Glycine
• Alanine
• Valine
• Serine

Answer: Valine

Ques: Proteins on hydrolysis give:

• Glucose
• Amino acids
• Nucleotides
• Fatty acids

Answer: Amino acids

Ques: Hemoglobin is an example of:

• Simple protein
• Conjugated protein
• Fibrous protein
• Polysaccharide

Answer: Conjugated protein

Ques: Nucleic acids are made of:

• Amino acids
• Nucleotides
• Monosaccharides
• Fatty acids

Answer: Nucleotides

Ques: The sugar present in RNA is:

• Ribose
• Deoxyribose
• Glucose
• Fructose

Answer: Ribose

Ques: In DNA, adenine pairs with:

• Guanine
• Cytosine
• Thymine
• Uracil

Answer: Thymine

Ques: The number of hydrogen bonds between G and C in DNA is:

• One
• Two
• Three
• Four

Answer: Three

Ques: Which of the following is not a purine base?

• Adenine
• Guanine
• Cytosine
• None of these

Answer: Cytosine

Ques: Enzymes are chemically:

• Lipids
• Proteins
• Carbohydrates
• Vitamins

Answer: Proteins

Ques: The part of an enzyme where a substrate binds is called:

• Active site
• Binding site
• Reaction site
• None

Answer: Active site

Ques: Enzyme activity is affected by:

• pH
• Temperature
• Substrate concentration
• All of these

Answer: All of these

Ques: The first enzyme discovered was:

• Pepsin
• Amylase
• Urease
• DNA polymerase

Answer: Urease

Ques: Which enzyme breaks down starch into maltose?

• Lipase
• Amylase
• Pepsin
• Trypsin

Answer: Amylase

Ques: Deficiency of Vitamin D causes:

• Scurvy
• Rickets
• Night blindness
• Beri-beri

Answer: Rickets

Ques: Vitamin C is also known as:

• Thiamine
• Riboflavin
• Ascorbic acid
• Calciferol

Answer: Ascorbic acid

Ques: Which vitamin is fat soluble?

• Vitamin B1
• Vitamin C
• Vitamin K
• Vitamin B12

Answer: Vitamin K

Ques: Vitamin A is essential for:

• Bone formation
• Blood clotting
• Vision
• DNA synthesis

Answer: Vision

Ques: Deficiency of Vitamin B12 leads to:

• Scurvy
• Anemia
• Rickets
• Night blindness

Answer: Anemia

Ques: Fats are composed of:

• Amino acids
• Fatty acids and glycerol
• Glucose
• Nucleotides

Answer: Fatty acids and glycerol

Ques: Which of the following is a saturated fatty acid?

• Oleic acid
• Stearic acid
• Linoleic acid
• Arachidonic acid

Answer: Stearic acid

Ques: Phospholipids are major components of:

• DNA
• RNA
• Cell membranes
• Ribosomes

Answer: Cell membranes

Ques: Waxes are esters of:

• Glycerol and fatty acids
• Long-chain alcohols and fatty acids
• Amino acids
• Monosaccharides

Answer: Long-chain alcohols and fatty acids

Ques: Which of the following is a lipid-soluble vitamin?

• Vitamin C
• Vitamin B1
• Vitamin D
• Vitamin B2

Answer: Vitamin D

Ques: Biomolecules are mainly studied under:

• Organic chemistry
• Physical chemistry
• Biochemistry
• Inorganic chemistry

Answer: Biochemistry

Ques: The first biomolecule discovered was:

• Protein
• Nucleic acid
• DNA
• Enzyme

Answer: Nucleic acid

Ques: Hydrolysis of sucrose gives:

• Glucose + Glucose
• Glucose + Fructose
• Glucose + Galactose
• Glucose + Mannose

Answer: Glucose + Fructose

Ques: Which is known as milk sugar?

• Sucrose
• Maltose
• Lactose
• Glucose

Answer: Lactose

Ques: Hormones are secreted by:

• Enzymes
• Endocrine glands
• Exocrine glands
• Neurons

Answer: Endocrine glands

Ques: DNA differs from RNA because DNA contains:

• Ribose sugar
• Uracil
• Deoxyribose sugar
• Adenine

Answer: Deoxyribose sugar

Ques: Enzymes increase reaction rate by:

• Increasing activation energy
• Lowering activation energy
• Changing equilibrium
• Breaking bonds permanently

Answer: Lowering activation energy

Ques: Which is a storage polysaccharide in animals?

• Cellulose
• Starch
• Glycogen
• Chitin

Answer: Glycogen

Ques: Insulin is a:

• Hormone and protein
• Enzyme
• Vitamin
• Lipid

Answer: Hormone and protein

Ques: The sequence of nucleotides in DNA determines:

• Protein structure
• Vitamin synthesis
• Lipid structure
• Enzyme activity only

Answer: Protein structure