Question

1. why is a buffer useful to cells?

Explanation:

Cells have biochemical reactions and processes that are highly sensitive to changes in pH. Buffers are substances (usually a weak acid and its conjugate base or vice versa) that can resist changes in pH when small amounts of acid or base are added. For example, in biological systems, enzymes (which are proteins) have an optimal pH range for their activity. If the pH of the cellular environment changes significantly, the structure of enzymes (like their active site) can be altered, leading to a loss of catalytic activity. Buffers help maintain the pH within a narrow, optimal range, ensuring that cellular processes such as metabolism, protein synthesis, and membrane transport can occur efficiently without being disrupted by pH fluctuations.

Answer:

A buffer is useful to cells because it resists changes in pH, maintaining the cellular environment's pH within a narrow, optimal range. This is crucial as many cellular processes (e.g., enzyme - catalyzed reactions, protein structure/function, metabolic pathways) are highly pH - sensitive; deviations from the optimal pH can disrupt these processes, and buffers prevent such disruptions by neutralizing added acids or bases.