Final answer:
A deficiency in the enzyme adenosine deaminase can lead to an immunodeficiency disease. The statement is a) true.
Step-by-step explanation:
A deficiency in the enzyme adenosine deaminase can lead to an immunodeficiency disease.
This is true. A deficiency in the enzyme adenosine deaminase (ADA) can lead to a condition known as ADA deficiency or ADA-SCID (severe combined immunodeficiency). ADA is responsible for breaking down a toxin called deoxyadenosine, and a deficiency in ADA leads to the accumulation of this toxin.
The toxic buildup can result in the destruction of immune cells, specifically B and T cells, which are crucial for adaptive immunity.