Kohler and Lipton first discovered a growth factor (PDGF) by:

A. observing that fibroblasts could not grow in
cell culture without adding PDGF to the
growth medium.
B. observing that fibroblasts could not grow in
cell culture without adding bovine blood
serum to the growth medium.
C. observing that fibroblasts grew better in
cell culture when blood serum was added to
the growth medium instead of blood plasma.
D. observing that fibroblasts could not grow
and repair wounding without the action of
platelets.
E. observing that fibroblasts could not grow in
cell culture without the addition of purified red
blood cells.


C

Biology & Microbiology

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