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COMEDK 2025 Morning Solved Paper

Question : 83 of 180

Marks: +1, -0

Choose the incorrect statement.

The hormone Glucocorticoid controls the level of excretion of water and salts by the kidney.
Vitamins $A$ and $K$ are fat soluble and are stored in the liver of human beings.
Denaturation of protein is due to loss of both the secondary and tertiary structures of the protein.
Complete hydrolysis of RNA gives Nitrogen containing bases, a pentose sugar and phosphoric acid.

Solution:

Concept:

The incorrect statement misattributes the function of regulating water and salt excretion to the wrong hormone.

This function is performed by mineralocorticoids, not glucocorticoids.

Explanation:

Glucocorticoids (e.g., cortisol) control metabolism and the body's stress response.

Mineralocorticoids (e.g., aldosterone) regulate the kidney's excretion of water and salts.

Thus, Option A is incorrect because it incorrectly assigns a mineralocorticoid function to glucocorticoids.

Option B: Vitamins

A

and

K

are fat-soluble vitamins that are stored in the liver — this statement is correct.

Option C: Denaturation of a protein involves the loss of its secondary and tertiary structures — this is a correct description.

Option D: Complete hydrolysis of RNA yields nitrogenous bases, a pentose sugar (ribose), and phosphoric acid (

\mathrm{H}_3\mathrm{PO}_4

) — this statement is also correct.

Therefore, the only incorrect statement is Option A.

Answer:

Option A

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