Precipitation tests involve all of the following except
A. they include the VDRL test for syphilis.
B. a cloudy or opaque zone developing where antigen and antibody react.
C. they are often performed in agar gels.
D. they can be done in a test tube by carefully adding antiserum over antigen solution.
E. they rely on formation of visible clumps for detection.
Answer: E
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The result of migration is to _____ genetic differences among populations
A. reduce B. increase
The melting point is:
A. the temperature at which double-stranded DNA begins to melt. B. the temperature at which double-stranded DNA is completely melted. C. the temperature at which double-stranded DNA is too single-stranded to ever renature back to double strands. D. the temperature at which double-stranded DNA has become 50% single-stranded. E. the temperature at which double-stranded nucleic acids degrade into free nucleotides.
Two of Darwin's finches display a character displacement when they occur as sympatric species. Which of the statements correctly interprets the graph?
A. Both species have the same size beak on Santa Maria Island.
B. Both species have the same size beaks on Daphne Major.
C. Both species have the same size beaks on Los Hermanos Island.
D. The two species have different beak sizes when they occur on the same island.
E. The two species feed on different food resources; one feeds on seeds while the other feeds on insects.
What tissue type produces the tough coverings that package organs?
A. dense regular connective tissue B. collagen C. dense irregular connective tissue D. loose connective tissue E. adipose