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Previous Year Questions

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135 Questions
CBSE
#1 Class Class 12 Chemistry Biomolecules 2025 Long 4M
Read the passage carefully and answer the questions that follow. Ribose and 2-deoxyribose have an important role in biology. Among the most important derivatives are those with phosphate groups attached at the 5 posit...
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CBSE
#2 Class Class 12 Chemistry Biomolecules 2025 Short 2M
What is meant by essential amino acids ? Why are amino acids amphoteric in nature ?
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CBSE
#3 Class Class 12 Chemistry Biomolecules 2025 Mcq 1M
In the Haworth structure of glucose, the various carbon atoms have been numbered. The carbon at position 1 bears $-OH$ and $-H$ and is joined to the ring oxygen; positions 2, 3 and 4 each bear $-OH$ and $-H$; position...
A. 1
B. 2
C. 3
D. 5
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CBSE
#4 Class Class 12 Chemistry Biomolecules 2025 Short 3M
(a) Write the product obtained when D-glucose reacts with $H_2N-OH$. (b) Amino acids show amphoteric behaviour. Why ? (c) Why can vitamin C not be stored in our body ?
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CBSE
#5 Class Class 12 Chemistry Biomolecules 2025 Short 3M
Define the following terms : (a) Glycosidic linkage (b) Invert sugar (c) Oligosaccharides
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CBSE
#6 Class Class 12 Chemistry Biomolecules 2025 Long 1M
Assertion (A) : Vitamin D cannot be stored in our body. Reason (R) : Vitamin D is a fat soluble vitamin and is not excreted from the body in urine.
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CBSE
#7 Class Class 12 Chemistry Biomolecules 2025 Mcq 1M
Scurvy is caused due to deficiency of :
A. Vitamin B1
B. Vitamin B2
C. Ascorbic acid
D. Glutamic acid
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CBSE
#8 Class Class 12 Chemistry Biomolecules 2025 Mcq 1M
Nucleotides are joined together by :
A. Glycosidic linkage
B. Peptide linkage
C. Hydrogen bonding
D. Phosphodiester linkage
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CBSE
#9 Class Class 12 Chemistry Biomolecules 2025 Mcq 1M
Which of the following is/are examples of denaturation of protein ?
A. Coagulation of egg white
B. Curdling of milk
C. Clotting of blood
D. Both (A) and (B)
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CBSE
#10 Class Class 12 Chemistry Biomolecules 2025 Short 3M
Define the following terms : (a) Native protein (b) Nucleotide (c) Essential amino acid
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CBSE
#11 Class Class 12 Chemistry Biomolecules 2025 Short 2M
What are the hydrolysis products of : (a) Sucrose (b) Lactose
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CBSE
#12 Class Class 12 Chemistry Biomolecules 2025 Short 3M
(a) Write the reaction when D-glucose reacts with the following : (i) $NH_2OH$ (ii) Acetic anhydride (b) Why can vitamin C not be stored in our body ?
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CBSE
#13 Class Class 12 Chemistry Biomolecules 2025 Short 2M
Give reasons for the following : (a) The melting points of $\alpha$-amino acids are generally higher than that of the corresponding carboxylic acids. (b) Amino acids show amphoteric behaviour.
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CBSE
#14 Class Class 12 Chemistry Biomolecules 2025 Short 3M
(a) What is the difference between native protein and denatured protein ? (b) Which one of the following is a disaccharide ? Glucose, Lactose, Amylose, Fructose (c) Which vitamin is responsible for the coagulation of ...
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CBSE
#15 Class Class 12 Chemistry Biomolecules 2025 Short 2M
Write the reactions involved when D-glucose is treated with the following reagents : (a) HCN (b) $Br_2$ water
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CBSE
#16 Class Class 12 Chemistry Biomolecules 2025 Long 1M
Assertion (A) : All naturally occurring $\alpha$-amino acids except glycine are optically active. Reason (R) : Most naturally occurring amino acids have L-configuration.
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CBSE
#17 Class Class 12 Chemistry Biomolecules 2026 Long 4M
Read the passage carefully and answer the questions that follow. Carbohydrates are optically active polyhydroxy aldehydes or ketones, or molecules that provide such units on hydrolysis. They are broadly classified int...
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CBSE
#18 Class Class 12 Chemistry Biomolecules 2026 Short 2M
(a) What are essential amino acids ? How do you explain the amphoteric behaviour of amino acids ? OR (b) Define the following terms : (i) Peptide linkage (ii) Nucleotide
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CBSE
#19 Class Class 12 Chemistry Biomolecules 2026 Short 2M
(a) Name the disease caused by the deficiency of Vitamin A. (b) How will you confirm the presence of carbonyl group as an aldehydic group in glucose ?
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CBSE
#20 Class Class 12 Chemistry Biomolecules 2026 Short 2M
(a) Name two water-soluble vitamins. (b) How will you prove the absence of free $-CHO$ group in the cyclic structure of glucose molecule ?
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