Which statement about immunodeficiency is true?
a. Immunodeficiencies allow pathogens to proliferate.
b. Immunodeficiencies are typically present at birth.
c. Immunodeficiencies tend to trigger hypersensitivities.
d. Immunodeficiencies block autoantibodies from developing.
a. Immunodeficiencies allow pathogens to proliferate.
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A ________ is a noncellular infectious agent with a protein coat wrapped around genetic material
a. vector b. virus c. viroid d. prion e. bacteriophage
Heart block is a condition in which the SA node is properly functioning but the atria and ventricles are contracting out of synch. Which of the following statements explains why this happens?
A) The SA node is working extra hard to make the ventricles catch up. B) The heart valves are allowing blood to flow backward through the heart. C) The AV node is not sending signals to the ventricles as it should. D) The coronary arteries are not delivering blood to the heart.
A childhood illness caused by a herpesvirus and characterized by a "rosy" rash all over the body is known as
A) chickenpox. B) kissing disease. C) CMV. D) monkeypox. E) roseola.
Food contains essential organic compounds that can be broken down in our bodies and used as nutrients. What must be present to make a molecule "organic?"