The direction of cellulose microfibril synthesis in elongating plant cells is
a. parallel to the direction of cell elongation.
b. perpendicular to the direction of cell elongation.
c. perpendicular to the direction of microtubules under the plasma membrane.
d. parallel to the endoplasmic reticulum under the plasma membrane.
e. both b and d
Ans: e. both b and d
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