Temperature Effects on Enzyme Activity
Ever wondered why you get a fever when you're ill? Your body's enzymes work best at specific temperatures, and understanding this relationship is essential for your exams.
Temperature increases boost enzyme activity initially because molecules gain kinetic energy and move faster, leading to more frequent collisions between enzymes and substrates. Most human enzymes hit their optimum temperature around 40°C - any hotter and you'd be in serious trouble!
Beyond the optimum temperature, enzymes become denatured. Their protein structure breaks down, changing the shape of the active site so it no longer fits the substrate. Think of it like a lock getting bent - the key simply won't work anymore.
Quick Tip: The temperature coefficient (Q10) measures how much reaction rates increase with every 10°C rise - a handy concept for exam calculations!
Some organisms have adapted brilliantly to extreme temperatures. Thermophiles living in hot springs have enzymes with extra bonds for stability, whilst organisms in polar regions have more flexible enzyme structures to function in the cold.
