Class II MHC genes encode glycoproteins on the surface of cells that bind with antigen from
intracellular pathogens.
____________________ Indicate whether the statement is true or false.
F, I
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The mechanism for reactive oxygen species to cause mutation is
A. bases are oxidized to a variety of different products which might pair with a different base than the original base would have B. thymine bases are dimerized which causes a break in the DNA which is not repaired correctly. C. the reactive oxygen species stabilize different tautomeric forms of the bases causing inappropriate pairing. D. guanine is depurinated by the reactive oxygen species and if it is not repaired can result in any base being inserted.
A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies
covalently linked to fluorescent dyes (antibodies to mouse proteins--green; antibodies to human proteins--red). Forty minutes later, the researcher looked at the fused cell and observed ____.
a. the cell was still half red and half green. b. the red and green fluorescent labels were uniformly distributed across the entire membrane c. the red and green labels were distributed in intermingled patches d. the red and green labels flashed intermittently e. the red and green labels were distributed in a swirling pattern
Outgroup analysis looks for features that are shared derived characters in a given group of organisms. Indicate whether the statement is true or false
The light microscope has a resolving power of
A. 0.01 mm. B. 0.1 mm. C. 0.0001 mm. D. 0.00000001 mm. E. 0.000001 mm.