Phospholipase is an enzyme that cleaves the phosphate head group off a phospholipid molecule. The plasma membrane is not, however, permeable to the enzyme
Imagine a cell where phospholipid A is present in the monolayer facing the exterior of the cell, and
phospholipid B is present in the monolayer facing the interior of the cell. After adding phospholipase to the medium in which the cell is growing, what would you expect to find in
the fluid surrounding the cell?
A. the phosphate head group from
phospholipid A only
B. the phosphate head group from
phospholipid B only
C. phosphate head groups from both
phospholipids A and B
D. phosphate head groups from neither
phospholipids A nor B
Answer Key: A
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