What is the function of enzymes in cellular processes?

Enzymes play a crucial role in cellular processes primarily by speeding up chemical reactions. They are biological catalysts that lower the activation energy required for reactions to occur, which means that they enable reactions to happen more quickly and efficiently than they would without the presence of enzymes. This acceleration is essential for maintaining life, as many biological processes such as metabolism, DNA replication, and cellular respiration rely on rapid chemical reactions.

The ability of enzymes to facilitate reactions is due to their specific active sites, which bind to substrate molecules and bring them into a favorable orientation for the reaction to occur. This specificity not only speeds up the reaction but also ensures that the right biochemical pathways are followed in the complex environment of a living cell.

In contrast to the other options, enzymes do not provide structural support, store energy, or transport substances across membranes. Instead, their primary function is centered around catalyzing reactions, which is vital for the proper functioning of cells and overall biological systems.