Severe Combined Immunodeficiencies (SCIDs) Are Due to _______

question 68

Multiple Choice

Severe combined immunodeficiencies (SCIDs) are due to _______.

• A) autoantibodies
• B) delayed hypersensitivity
• C) congenital absence or immaturity of the thymus gland
• D) a genetic defect in the development of both T cells and B cells
• E) failure of B-cell development and maturity

---

Definitions:

Neuron

A specialized cell transmitting nerve impulses; a nerve cell, fundamental in the nervous system for sending and receiving information through electrical and chemical signals.

Epigenetic Influences

Refer to external modifications to DNA that turn genes on or off without changing the DNA sequence itself, affecting how cells read genes.

Gene Expression

Gene Expression is the process by which information from a gene is used to synthesize a functional gene product, such as proteins, influencing the traits and behavior of an organism.

Concordance Rates

A measure in genetics that indicates the likelihood of two related individuals (usually twins) both showing a particular trait or disorder.