When the immune system is activated by a normally harmless antigen, this is called

a. an allergy.
b. an innate response.
c. a complement response.
d. cytotoxic cell response.


a. an allergy.

Biology & Microbiology

You might also like to view...

Random distribution of individuals in a population occurs when resource availability is ____ and individuals ____ one

another. a. scarce; attract b. clumped; neither attract nor avoid c. random; avoid d. uniform; neither attract nor avoid e. scarce; avoid

Biology & Microbiology

Which type of bond represents a weak chemical bond?

a) nonpolar covalent bond b) polar covalent bond c) hydrogen bond d) ionic bond

Biology & Microbiology

Dandelions develop seeds by apomixis. What benefits does this strategy provide over vegetative or sexual reproduction?

A. Apomixis provides the benefits of seed dispersal, while maintaining a genome adapted to a given climate. B. Apomixis is beneficial in sheltered areas where wind pollination would be difficult. C. Apomixis is beneficial for plants that attract a diverse mix of bees and other pollinators. D. Apomixis makes the dandelions more resistant to herbicides.

Biology & Microbiology

What is meant by the statement "science is measurement"?

What will be an ideal response?

Biology & Microbiology