A patient has a defective gene for the enzyme Adenosine Dea…

Biology Biotechnology and Its Application Biotechnological Applications in Medicine Single Correct MCQ

Published on: August 21, 2026

A patient has a defective gene for the enzyme Adenosine Deaminase (ADA). He/She lacks functional cells and therefore, fails to fight the infecting pathogens. The cells are

B-lymphocytes and

Phagocytes

T-lymphocytes

Both

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The correct answer is:

ADA deficiency causes Severe Combined Immunodeficiency (SCID), in which the immune system is severely impaired. The affected person lacks properly functioning:

• B-lymphocytes (responsible for antibody production)

• T-lymphocytes (responsible for cell-mediated immunity)

As a result, the body cannot effectively fight infections.

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