Biomolecules
Boards Previous Year Questions
Class-XII
Multiple Choice Questions:
Que : Which of the following structure represents α-D-glucose:
Que : On the hydrolysis, which of the following carbohydrates gives glucose and galactose:
a)Sucrose b) Lactose c) Maltose d) Cellulose
Que : Proteins are polymers of:
a) Nucleic Acid b) Amino acids c) Monosaccharides d) Amines
Que : The deficiency of which of the following carbohydrates causes ‘Rickets’:
a) Vitamin A b) Vitamin B c) Vitamin C d) Vitamin D
(2024)
Que : Which of the following acids represents Vitamin C?
a) Saccharic acid b) Gluconic acid c) Ascorbic acid d) Benzoic acid
Assertion and Reason:
(2024)
Que : Assertion (A): Fructose is a reducing sugar.
Reason (R): Fructose does not reduce Fehling solution and Tollen’s reagent
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Long Type Questions:
Que : Which one of the following is a disaccharide: starch, maltose, glucose, fructose.
Que : Sucrose has glucose and fructose still it is a non-reducing sugar, why?
Que : Glucose does not give 2,4-DNP test, why?
Que : What are the basic structural difference between glucose and fructose?
Que : Answer the following:
a) The penta-acetate of glucose does not react with hydroxylamine. What does it indicate?
b) Why can not vitamin (C) be stored in our body?
Que : Answer the following questions:
i) What is the difference between glycosidic and peptide linkage?
ii) Which amino acids are called essential amino acids?
iii) What are the common types of secondary structure of proteins? Write any two forces which stabilize the
secondary and tertiary structure of protein.
Que : Write the difference between:
i) Amylose and Amylopectic
ii) Peptide (amide) linkage and glycocydic linkage
iii) Fibrous and Globular protein
Que : Define: i) Polysaccharides ii) Essential amino acid iii) Denaturation of Protein iv) Anomers (2024)
v) Monosaccharides (2024) vi) Non-Essential amino acid (2024)
Que : Define the following as related to proteins:
i) Glycosidic linkage ii) Anomers iii) Peptide linkage iv) Denaturation
Que : Starch and cellulose both contain glucose units as monomers, yet they are structurally different, why?
Que : Write the product on hydrolysis of Lactose.
Que : Write a chemical reaction to show that open structure of D-glucose contain:
i) Straight Chain
ii) Five alcohol group
iii) Aldehyde and carbonyl
Que : Write the product when D-glucose react with HNO3.
Que : What happen when Glucose reacts with HI? Write chemical equation. (2024)
Que : Amino acid show amphoteric behavior, why?
Que : What is the difference between acidic and basic amino acid?
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Que : Write one difference between alpha-helix and beta-pleated structure of protein.
Que : Define primary structure of protein.
Que : Define denaturation of protein with an example. During denaturation which structure of protein lose their
biological activity.
Que : Which type of bonds holds a DNA double helix together? (2024)
Que : The two strands of DNA are not identical but are complimentary, why?
Que : What type of linkage is present in Nucleic Acid?
Que : Write the name of the linkage joining two nucleotides.
Que : What is the difference between nucleoside and nucleotide?
Que : What products would be formed when a nucleotide form DNA containing thymine is hydrolysed?
CLASSES BY ANKUR SIR @7983744732
