Bio test notes STUDY STUDY STUDY !!!!!!

QuestionWhat Answer
What's a catalyst ? a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Why is energy needed to do things in living things ? They need power to stay alive. They need energy to perform functions such as growth, maintaining balance, repair, reproduction, movement and defense.
What are the properties of water ? Boiling Point and Freezing Point.Surface Tension, Heat of Vaporization, and Vapor Pressure.Viscosity and Cohesion.Solid State.Liquid State.Gas State.
Why does diffusion occur ? The way that cell diffusion happens is by molecules moving from an area of high concentration to an area of low concentration.
What is diffusion ? The movement of molecules from a region of higher concentration to a region of lower concentration.
What is the function of an enzyme ? They lower activation energy and increase the rate of chemical reactions.
What are enzymes ? Catalysts for chemical reactions in living things.
Whats the lock and key model ? Only one substrate (key) fits in the active site (key hole) which is the enzyme (lock).
What is a chemical reaction ? a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.
Why do reactions occur ? Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules.
Why are enzymes needed important in our bodies ? Enzymes are proteins that control the speed of chemical reactions in your body.