Endogenous infectious agents arise from microbes that are
A. the patient's own normal flora.
B. on fomites.
C. in the air.
D. transmitted from one person to another.
E. in food.
Answer: A
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Which of the following statements about the pathogen-specific response is true?
A. The pathways involved always trigger the hypersensitive response. B. The pathogen is recognized by its avr gene product. C. There is never a gene-for-gene response. D. If the R gene product is not triggered, no disease will occur. E. Avr and R gene pairs have been cloned in species pathogenized by microbes, fungi, and insects.
Which molecule in the Krebs cycle acts as a substrate of the first reaction and is a product of the last reaction?
1.pyruvate 2.acetyl-coenzyme A 3.citrate 4.oxaloacetate
The part of the stamen that produces pollen is the ____
1.anther 2.carpel 3.corolla 4.filament
Which of the following is not a primate characteristic?
A) large litter size B) stereoscopic vision C) rotating shoulders D) flattened nails instead of claws