Which one of the following causes transmembrane channels in target cells?
A) granzymes
B) hapten
C) IL-1
D) IL-2
E) perforin
E
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Superantigens produce a harmful immune response because
A) they activate too many T cells, causing excessive inflammation and cell damage. B) they initiate a type I allergic response resulting in excessive inflammation. C) too many phagocytes are activated and destroy host tissue. D) a strong immune response is necessary to protect the host from the pathogen.
The intermediate disturbance hypothesis says that species richness is least in a community that has
moderate disturbances.
Indicate whether the statement is true or false.Honeybees convey information to other worker bees
in the hive about all EXCEPT the __________ of a food source. a. direction b. general location c. distance d. abundance e. angle relative to the sun
Chromosomes contain large amounts of interacting proteins known as
a. pentanes. b. hexosamines. c. histones. d. protein hormones. e. histamines.