which are necessary for a general signal cascade in the immune
system to activate transcription
i. receive a signal that may be a soluble protein
ii. a membrane receptor
iii. protein kinases
iv. phosphatases
v. transcription factors
a) i, ii and v
b) i,ii,iii, v
c) ii, iii, iv
d) i,ii,iii,iv
e) i,ii,iii,iv and v