Which one of the following enzyme bring about hydrolysis of lactose to glucose and galactose?
- Transacetylase
- Amylase
- Permease
- β-galactosidase
The Correct Option is D
Solution and Explanation
The enzyme responsible for the hydrolysis of lactose into its constituent sugars, glucose and galactose, is β-galactosidase. This enzyme breaks the β-glycosidic bond between glucose and galactose in lactose, allowing their release as separate monosaccharides.
Options A (Transacetylase), B (Amylase), and C (Permease) are not associated with the hydrolysis of lactose.
So, the correct option is (D): β-galactosidase.
Top Questions on Biomolecules
- Scurvy is caused due to deficiency of
- CBSE CLASS XII - 2025
- Chemistry
- Biomolecules
- Assertion (A): Vitamin D cannot be stored in our body. Reason (R): Vitamin D is fat-soluble vitamin and is not excreted from the body in urine.
- CBSE CLASS XII - 2025
- Chemistry
- Biomolecules
- The carbohydrates are stored in animal body as
- KEAM - 2025
- Chemistry
- Biomolecules
- Identify the correct statements regarding the enzymes
I) Almost all enzymes are proteins
II) Enzymes are not specific in nature
III) Enzymes work effectively in the pH range of 5–7
IV) Enzymes work effectively between 310 K and 330 K temperature- AP EAPCET - 2025
- Chemistry
- Biomolecules
- Identify the sets in which enzyme, its source and enzyme reaction are correctly matched:
I) maltase, yeast; proteins $\rightarrow$ peptides
II) diastase, malt; starch $\rightarrow$ maltose
III) zymase, yeast; glucose $\rightarrow$ C$_2$H$_5$OH + CO$_2$- AP EAPCET - 2025
- Chemistry
- Biomolecules
Questions Asked in CUET exam
- Rearrange the parts to form a logical sentence:
A) the city's new policy
B) has significantly improved
C) air quality
D) over the past year- CUET (UG) - 2025
- Sentence Arrangement
Fill in the blank with the correct option:
She has been working here __________ five years.- CUET (UG) - 2025
- Prepositions
- If $ A $ is a square matrix such that $ \text{adj}(\text{adj}(A)) = A $, then $ |A| $ is:
- CUET (UG) - 2025
- Matrices
- A train crosses a platform 200 m long in 36 seconds and a pole in 18 seconds. Find the speed of the train.
- CUET (UG) - 2025
- Speed, Time and Distance
Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. that maintaining a positive attitude
Q. even in difficult situations
R. is essential for success
S. and helps overcome obstacles effectively- CUET (UG) - 2025
- Sentence Arrangement
Concepts Used:
Biomolecules
Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.
- Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
- Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
- Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
- Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.