The enzyme that breaks down lactose is: MCQ with Answer and Explanation

The enzyme that breaks down lactose is:
A. Amylase
B. Lactase
C. Sucrase
D. Maltase
Answer: Option B
Solution (By JKSSB Mock Tests)
Lactase hydrolyzes lactose (milk sugar) into glucose and galactose. Lactose intolerance is due to lactase deficiency. Sucrase acts on sucrose, maltase on maltose.

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Practice More Biology Questions

Question #1
The hormone that stimulates the secretion of cortisol from the adrenal cortex is:
A. TSH
B. ACTH
C. FSH
D. Prolactin

Correct Answer: Option B


Explanation:
Adrenocorticotropic hormone (ACTH) from the anterior pituitary stimulates the adrenal cortex to produce cortisol and androgens. TSH stimulates thyroid, FSH gonads.

This question belongs to: Science Biology
Question #2
Which hormone is responsible for lowering blood glucose levels by promoting cellular uptake of glucose?
A. Thyroxine
B. Cortisol
C. Glucagon
D. Insulin

Correct Answer: Option D


Explanation:
Insulin is a peptide hormone secreted by the beta cells of the Islets of Langerhans in the pancreas. Its primary function is to lower blood glucose levels (hypoglycemic effect) by promoting the cellular uptake of glucose, particularly in muscle and fat cells, and its conversion to glycogen (glycogenesis) in the liver. Glucagon has the opposite effect.

This question belongs to: Science Biology
Question #3
Assertion (A): The plasma membrane is selectively permeable.
Reason (R): It allows some substances to pass through while blocking others.
A. A true, R false.
B. A false, R true.
C. Both A and R are true, but R is not the correct explanation.
D. Both A and R are true, and R is the correct explanation.

Correct Answer: Option D


Explanation:
Selective permeability means the membrane controls entry and exit of substances based on size, charge, and solubility. R defines this property and explains A.

This question belongs to: Science Biology