The first example of an antimicrobial drug synthesized in the laboratory was
A. penicillin.
B. sulfa.
C. erythromycin.
D. Salvarsan.
D
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The yellow color of urine is from
a. urea. b. salts. c. degraded hemoglobin. d. blood plasma proteins. e. glucose
An organism's is its position in the food chain, relative to the ecosystem's energy source.
A. keystone level B. climax level C. trophic level D. habitat E. niche
During this stage of mitosis, the nuclear envelope begins to break down and the spindle begins to form.
A. Metaphase B. Prometaphase C. Anaphase D. Prophase E. Telophase
You are studying a trafficking protein important for secretion in helper T cells. What is the likely outcome of a defect in this protein?
A. Impaired secretion of immunoglobulins B. Impaired secretion of degraded antigens C. Impaired secretion of cytokines D. Impaired secretion of membrane attack complex