Which fetal-bovine-serum functions in animal-cell culture are CORRECT? P stimulates growth; Q enhances attachment; R supplies hormones/minerals; S maintains pH at 7.4.
Serum supplies growth-promoting factors, attachment-supporting proteins and nutrients including hormones/minerals, making P,Q,R true. A fixed pH of 7.4 is maintained by the medium’s buffering and gas-control conditions, not guaranteed by serum. Therefore C excludes S.
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