Which statement about the immune system is correct?
a. Memory cells are involved in a primary immune response.
b. Dendritic cells were first identified in the nervous system.
c. Interferons are specific proteins that block cell replication at the level of mitosis.
d. Natural killer cells are involved in both specific and nonspecific immune responses.
e. Defensins are one type of protective protein synthesized by T helper cells.
d
You might also like to view...
When an enzyme linked receptor is activated, a conformational change activates the extracellular kinases. Indicate whether the statement is true or false
Mushrooms are a type of which of the following?
?A. conidia ?B. ascus ?C. polar tubule ??D. basidiocarp
The clearing made by bacteriophages in a "lawn" of bacteria on an agar plate is called a ________
A) host range B) plaque C) lysogenic zone D) prophage E) clear zone
What kind of interaction occurs when two cardinals (birds of the same species) are trying to build a nest in the same tree?
a. intraspecific competition b. mutualism c. fundamental competition d. interspecific competition