The soils in which most plants do best are ____
a. mixtures of mainly sand and silt
b. sandy soils
c. soils made mostly of humus
d. clay soils
e. loams
ANSWER: e
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The __________ circuit carries blood from the heart
to body tissues, and then returns it to the heart. Fill in the blank(s) with the appropriate word(s).
The toxin that allows Rhizopus to cause the rice disease known as seedling blight is actually produced by ________ growing within the fungus.
A. Staphylococcus B. Clostridium C. Staphylococcus or Burkholderia, but not Clostridium D. Burkholderia E. None of the choices are correct.
RNA interference (RNAi) can be used by
A) researchers to induce the production of more mRNA. B) researchers to artificially turn on gene expression. C) viruses to stop the production of new proteins. D) cells to prevent infections from double-stranded RNA viruses.
Which of the following mechanisms is used by gram-negative bacteria to cross the blood-brain barrier?
A) producing fimbriae B) inducing endocytosis C) producing toxins D) inducing TNF E) antigenic variation