The surface receptors on B and T cells both
A. play the same role in each type of cell.
B. bind to free antigen.
C. have two binding sites for antigen.
D. have variable and constant regions.
E. play the same role in each type of cell AND have two binding sites for antigen.
D
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Which of the following is an adaptive response of a predator?
a. nonretractable claws of cheetahs b. grasshopper mouse plunging the chemical spraying end of a beetle into the ground c. all of the choices d. koala digestive tracts being tough enough to handle eucalyptus leaves
Which variety of plant has a noticeable sporophyte?
a. hornwort b. liverwort c. bryophyte d. horsetail
The type of epithelial tissue that forms a multiple layer of flattened cells is
A. stratified squamous. B. simple squamous. C. simple cuboidal. D. simple columnar. E. stratified columnar.
The use of RFLPs for "genetic fingerprinting" is based upon
a. the type of gel used in electrophoresis. b. identical alleles at loci. c. differences of locations where enzymes make their cuts. d. differences between blood and semen DNA. e. bonding of DNA to RNA.