Which of the following describes the main role of the electron transport chain in cellular respiration?
A. It produces molecules of ATP.
B. It produces the energy carriers.
C. It breaks down glucose molecules.
D. It pumps hydrogen ions inside the cell.

Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i