What is a superantigen?
a protein that is highly efficient at stimulating a single type of productive and specific t cell response
a protein produced by antigen-presenting cells to enhance their presentation capabilities
a protein produced by t cells as a way of increasing the antigen activation they receive from antigen-presenting cells
a protein that activates t cells in a nonspecific and uncontrolled manner

Which of the following is an example of a non-falsifiable hypothesis? a. there is a teacup orbiting the milky way galaxy. b. there is no life on mars. c. the human species started in africa. d. humans cannot live without the amino acid methionine

Plz genetic engineering can be applied to many fields including medicine and agriculture. which of the following is a medical application of genetic engineering? a. giving crop plants recombinant dna so that they would be resistant to herbicides. b. examining a persons pedigree to determine whether they can carry a gene for a genetic disease. c. analyzing a persons dna to see how closely they are related to another person. d. certain genes into bacteria so that they will produce a needed medicine.

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.