The classic pathway of complement activation begins when the ...

[sc00by25]

The classic pathway of complement activation begins when the protein C1 binds to
 A) the cell wall of bacteria.
  B) the plasma membrane of bacteria.
  C) two antibodies attached to an antigen.
  D) a cell surface antigen.
  E) a plasma protein.

Question 2

Pain is to ________ as cold is to ________.
 A) nociceptors; thermoreceptors
  B) baroreceptors; chemoreceptors
  C) baroreceptors; nociceptors
  D) chemoreceptors; nociceptors
  E) baroreceptors; thermoreceptors

[TDubDCFL]

Answer to Question 1

C

Answer to Question 2

A

[sc00by25]

Thanks for the timely response, appreciate it

[jojobee318]

Great answer, keep it coming