Question

question 12
bacterial smears are fixed before staining to
a make their walls permeable.
b accept stain.
c make the cells visible.
d affix the cells to the slide.

Explanation:

Fixing bacterial smears before staining is mainly to attach the bacterial cells firmly to the slide so they don't wash away during the staining process. It doesn't primarily make walls permeable, help in accepting stain directly, or make cells visible.

Answer:

D. affix the cells to the slide