What is the most common cause of a miscarriage?
a. cervical incompetence
b. genetic disorders of the embryo or fetus
c. infections
d. trauma
e. malnutrition of the mother
B
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Self-recognition is based on T cell receptors recognizing:
a. MHC markers b. perforins c. complement d. naive B cells e. antibodies
Which of these diseases involves the destruction of the myelin sheath on certain neurons within the brain and spinal cord?
A) depression B) Alzheimer's disease C) Parkinson's disease D) multiple sclerosis
Before Darwin published his work, Lamarck and others had suggested mechanisms for evolution. By what means did Darwin propose species evolved over time?
A) Overproduction of young B) Passing on acquired traits C) Survival of the strongest D) Natural selection
Creutzfeld-Jacob disease is
A. caused by a chronic latent virus. B. initiated by an oncogenic virus. C. caused by a viroid. D. a spongiform encephalopathy of humans. E. also called "mad cow disease"