Biology Forums - Study Force

A patient's serum is analyzed and found to have an abnormally low level of CD8 molecules. This
  suggests that the patient has insufficient numbers of
 
  a. macrophages.
  b. B cells.
  c. cytotoxic T cells.
  d. helper T cells.
  e. NK cells.

Question 2

How is active immunity different from passive immunity?
 
  a. Active immunity is slower in onset and shorter-lived.
  b. Active immunity is slower in onset and longer-lived.
  c. Active immunity is faster in onset and shorter-lived.
  d. Active immunity is faster in onset and longer-lived.
  e. Only active immunity involves antibodies.

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Thank you