Class II MHC are found on
A) the skin.
B) red blood cells.
C) cytoplasmic membranes of nucleated cells.
D) muscle cells.
E) professional antigen-presenting cells.
E
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One laboratory group repeated the same experiment described by others with the identical bacterial isolate and the same growth medium and conditions used but were unable to achieve the same O.D. at 600 nm
. What is the LEAST likely cause for this discrepancy of turbidity measured? A) One lab used 16 mm wide test tubes and the other used 18 mm wide test tubes. B) One lab subtracted the yellow color of the growth medium away from the final turbidity reported whereas the other lab used colorless water. C) One lab vigorously dispersed the biofilm-forming bacteria with vortexing and the other did not. D) The two labs varied with 1000 m elevation and did not consider the influence of pressure.
DNA vaccines work by
A. stimulating production of antibodies against DNA. B. stimulating interferon production. C. inactivating the host DNA. D. having the cell use the introduced DNA to make the microbial protein antigen.
Which term BEST describes populations of trees, insects, mammals, fungi, bacteria, and many other organisms that interact in any location?
A. biosphere B. ecosystem C. bioregion D. community
Ethologist Konrad Lorenz raised geese from eggs and the first thing the goslings saw was him. Consequently, the goslings treated him as if he were their parent and followed him. This is an example of
A. sculpting. B. imprinting. C. nonassociative learning. D. classical conditioning. E. operant conditioning.