Of the three categories of media classification, which of the following refers to the chemical composition of the medium?
A) general purpose
B) selective
C) differential
D) nonsynthetic
Ans: D) nonsynthetic
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Among vertebrate animals, urea is _____
A) made in the kidneys and immediately excreted B) added to the air in the lungs to be exhaled, along with carbon dioxide C) made in the liver by combining two ammonia molecules with one carbon dioxide D) made in the pancreas and added to the intestinal contents, along with bile salts, for excretion E) rarely the nitrogenous waste
Which of the following glands secrete sebum, an oily like substance?
A) merocrine glands B) apocrine glands C) sebaceous glands D) eccrine.
A CD4+ T cell binds to an antigen only if this antigenis ____
a. in a complex with a class I MHC protein b. in a complex with a class II MHC protein c. in a complex with a class III MHC protein d. not in a complex with MHC proteins e. presented on the surface of a B cell
Which of the following can result when antibiotic therapy disrupts the normal microbiota?
A) anaphylactic shock B) black hairy tongue C) pseudomembranous colitis D) thrush E) both pseudomembranous colitis and thrush