Arrange in the correct sequence these components of the mammalian immune system as it first responds to a pathogen. i) pathogen is destroyed. ii) lymphocytes secrete antibodies. iii) antigens from a pathogen bind to antigen receptors on lymphocytes. iv) lymphocytes specific to antigens from a pathogen become numerous. v) only memory cells remain. a. i â iii â ii â iv â vb. ii â i â iv â iii â vc. iv â ii â iii â i â vd. iii â iv â ii â i â v

The answer is d. 3,4,2,1,5

Explanation:

The correct sequence is:

Adaptive Immune System/Acquired Immunity:

Adaptive immune system involves the part of immune system that is contains specific and highly specialized cells to target specific pathogens. Acquired immunity involves antigen specific antibodies that bind and mark a specific pathogen. This pathogen is then cytotoxically destroyed by specific effector cells of the immune system. Acquired immunity is also characterized by the production of memory cells at the time of mass production of antigen specific antibodies. These memory cells remain long after the pathogen has been destroyed to protect against consequent attacks from the same pathogen.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.