Which statement best defines enzymes?

Prepare for the Foundations of Biology Exam 1. Dive into key biological concepts with multiple choice questions, hints, and explanations. Ace the exam with our efficient study methods!

Multiple Choice

Which statement best defines enzymes?

Enzymes are biological catalysts that lower the activation energy required to carry out a reaction. They are typically proteins (with some RNA molecules also acting as enzymes) and have specific active sites where substrates bind, giving the reaction a precise path to occur. By stabilizing the transition state and properly orienting reactants, enzymes reduce the energy barrier that must be overcome, allowing reactions to proceed much faster under normal cellular conditions. They are not consumed in the reaction, so they can catalyze many cycles. They do not require high temperatures; excessive heat can denature them, and they usually work best at moderate, physiological temperatures and conditions. They are distinct from inorganic catalysts, which are not biological.

Enzymes are biological catalysts that lower the activation energy required to carry out a reaction. They are typically proteins (with some RNA molecules also acting as enzymes) and have specific active sites where substrates bind, giving the reaction a precise path to occur. By stabilizing the transition state and properly orienting reactants, enzymes reduce the energy barrier that must be overcome, allowing reactions to proceed much faster under normal cellular conditions. They are not consumed in the reaction, so they can catalyze many cycles. They do not require high temperatures; excessive heat can denature them, and they usually work best at moderate, physiological temperatures and conditions. They are distinct from inorganic catalysts, which are not biological.

More practice questions