Biomolecules
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Carbohydrates: Classification and functions
SubtopicCarbohydrates: Classification and functions under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
On hydrolysis, Lactose gives a mixture of:
A.Glucose and Fructose
B.Glucose and Glucose
C.Glucose and Galactose
D.Fructose and Galactose
- 2.
Which of the following carbohydrates is classified as an aldopentose?
A.Glucose
B.Ribose
C.Fructose
D.Glyceraldehyde
- 3.
The total number of chiral carbon atoms in the open-chain structure of Glucose is:
A.2
B.3
C.4
D.5
Download the worksheet for Biomolecules - Carbohydrates: Classification and functions to practice offline. It includes additional chapter-level practice questions.
Monosaccharides (Glucose and Fructose)
SubtopicMonosaccharides (Glucose and Fructose) under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
In the cyclic structure of glucose, how many chiral centers are present?
A.4
B.5
C.6
D.3
- 2.
Which of the following products is formed when D-fructose is reduced with sodium amalgam and water?
A.Only Sorbitol
B.Only Mannitol
C.A mixture of Sorbitol and Mannitol
D.Gluconic acid
- 3.
The specific rotation of a freshly prepared solution of -D-glucose changes from to a constant value of . This phenomenon is:
A.Inversion
B.Epimerization
C.Mutarotation
D.Optical activity
Download the worksheet for Biomolecules - Monosaccharides (Glucose and Fructose) to practice offline. It includes additional chapter-level practice questions.
D-L configuration
SubtopicD-L configuration under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
For a molecule with 'n' chiral centers, how many total stereoisomers are possible?
A.n
B.2n
C.D. - 2.
What is the relationship between the configuration of D-Glucose and D-Mannose?
A.They are enantiomers
B.They are epimers at C-2
C.They are the same molecule
D.One is the L-form of the other
- 3.
In a Fischer projection, the carbon chain is arranged:
A.Horizontally
B.Vertically
C.Diagonally
D.In a ring
Download the worksheet for Biomolecules - D-L configuration to practice offline. It includes additional chapter-level practice questions.
Proteins: Amino acids and peptide bonds
SubtopicProteins: Amino acids and peptide bonds under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
Proteins that contain only amino acids upon hydrolysis are called:
A.Conjugated proteins
B.Derived proteins
C.Simple proteins
D.Complex proteins
- 2.
How many water molecules are lost when four amino acids combine to form a tetrapeptide?
A.One
B.Two
C.Three
D.Four
- 3.
The Ninhydrin test is used to detect amino acids. What color is typically produced?
A.Red
B.Blue/Purple
C.Yellow
D.Green
Download the worksheet for Biomolecules - Proteins: Amino acids and peptide bonds to practice offline. It includes additional chapter-level practice questions.
Structure of proteins (Primary, secondary, tertiary, quaternary)
SubtopicStructure of proteins (Primary, secondary, tertiary, quaternary) under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
Which of these proteins has a quaternary structure consisting of two identical alpha chains and two identical beta chains?
A.Myoglobin
B.Hemoglobin
C.Insulin
D.Ribonuclease
- 2.
The 'pleated' appearance of the -sheet is due to the:
A.Planarity of the peptide bond and the geometry of the -carbon
B.Presence of sulfur atoms
C.High concentration of proline
D.Branching of the main chain
- 3.
Which of the following links amino acids in the primary structure?
A.Glycosidic linkage
B.Phosphodiester linkage
C.Peptide linkage
D.Hydrogen linkage
Download the worksheet for Biomolecules - Structure of proteins (Primary, secondary, tertiary, quaternary) to practice offline. It includes additional chapter-level practice questions.
Denaturation of proteins
SubtopicDenaturation of proteins under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
What is the consequence of exposing proteins to extreme pH values?
A.The protein becomes more stable
B.The ionic attractions and hydrogen bonds are disrupted
C.The protein turns into a carbohydrate
D.The primary structure is always cleaved
- 2.
A protein in its native state is usually:
A.Randomly coiled
B.Highly organized and folded
C.A straight line of amino acids
D.Insoluble in all solvents
- 3.
The loss of secondary and tertiary structure without breaking peptide bonds is called:
A.Hydrolysis
B.Denaturation
C.Hydrogenation
D.Saponification
Download the worksheet for Biomolecules - Denaturation of proteins to practice offline. It includes additional chapter-level practice questions.
Vitamins: Classification and deficiency
SubtopicVitamins: Classification and deficiency under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
Night blindness (inability to see in dim light) is caused by the lack of:
A.Vitamin B12
B.Vitamin A
C.Vitamin K
D.Vitamin C
- 2.
Which vitamin's deficiency causes loss of hair and skin inflammation?
A.Biotin
B.Retinol
C.Thiamine
D.Tocopherol
- 3.
Which vitamin is also known as Ergocalciferol?
A.Vitamin D2
B.Vitamin D3
C.Vitamin A
D.Vitamin E
Download the worksheet for Biomolecules - Vitamins: Classification and deficiency to practice offline. It includes additional chapter-level practice questions.
Nucleic Acids: DNA and RNA
SubtopicNucleic Acids: DNA and RNA under Biomolecules for Grade 12 ICSE.
Preview questions (no answers)
- 1.
The base sequence in DNA carries the information for the sequence of:
A.Sugars in a polysaccharide
B.Amino acids in a protein
C.Fatty acids in a lipid
D.Phosphates in a nucleotide
- 2.
The acidity of DNA and RNA is primarily due to the presence of:
A.Nitrogenous bases
B.Hydroxyl groups
C.Phosphate groups
D.Pentose sugars
- 3.
Which of the following bases has a single-ring structure?
A.Adenine
B.Guanine
C.Thymine
D.None of these
Download the worksheet for Biomolecules - Nucleic Acids: DNA and RNA to practice offline. It includes additional chapter-level practice questions.