Question

the purpose of a buffer in a cell
cells need buffering agents in order to
multiple choice
increase the amount of oh⁻ in their surroundings.
speed up chemical reactions.
carry out life functions in extremely acidic conditions.
minimize the changes in ph of their internal environment.
help transfer electrons from one atom to another.

Explanation:

• Buffers in cells don't aim to increase $\ce{OH^-}$ (eliminates first option).
• Enzymes speed up reactions, not buffers (eliminates second option).
• Cells can't function in extremely acidic conditions without buffering, but the main role of buffers is pH stability, not functioning in extreme acid (eliminates third option).
• Buffers resist pH changes, so they minimize pH fluctuations in the cell's internal environment (correct).
• Electron transfer is for redox reactions, not buffers (eliminates fifth option).

Answer:

D. minimize the changes in pH of their internal environment.