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

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

What could happen if two base pairs on a strand of dna or switched

Atest cross can be used to -predict the phenotypes of a monohybrid cross -predict an unknown genotype of a purebred dominant plant -cross-breed dominant and recessive plants -give probabilities that a trait will appear