Match the statements with the corresponding MHC Class:
Acquires antigenic peptide in the cytoplasm

a) receptors located exclusively on antigen presenting cells
b) presents antigenic peptides to CD8+ T cells
c) necessary for recognition by CD4+ T cells
d) receptors located on all nucleated cells

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.