Question

multiple select question
select all that apply
which of the following statements about the ph inside cells are true? more than one answer may be correct.

• it is important for cells to maintain a fairly constant ph.
• altering the shape of enzymes or other proteins generally has no effect on their function.
• the ph inside cells typically fluctuates with the ph of the environment.
• most enzymes in living systems are extremely sensitive to ph.
• even small changes in ph can alter the shape of enzymes and other proteins.

Explanation:

• Cell processes rely on stable pH, so maintaining constant pH is critical.
• Protein shape (including enzymes) directly impacts function; changes to shape disrupt function.
• Cells use buffering systems to keep internal pH stable, independent of environmental pH fluctuations.
• Enzymes have narrow optimal pH ranges, making them highly sensitive to pH changes.
• Small pH shifts disrupt weak bonds in proteins, altering their three-dimensional structure.

Answer:

A. It is important for cells to maintain a fairly constant pH.
D. Most enzymes in living systems are extremely sensitive to pH.
E. Even small changes in pH can alter the shape of enzymes and other proteins.