Which of the following statements about enzymes is not true?
A) all enzymes have the same shape as their substrates B) enzymes are proteins C) enzymes work best at a specified ph D) the shape of an enzyme allows it to do its job
Answers
Explanation:
Enzymes: what they are and what they do
Right now, as you read this, there are billions of chemical reactions happening inside your body. Although they happen at lightning speed inside cells, when these reactions are run inside test-tubes --- in a lab instead of a body --- they happen at a snail’s pace. What explains this difference in speed? What do our cells have, that a test-tube lacks? The answer is: enzymes!
Enzymes are life’s great facilitators. They create the conditions needed for biochemical reactions to happen fast. The general name that chemists use for a chemical entity that increases the speed of a reaction is a “catalyst.” Enzymes are biological catalysts--they catalyze the chemical reactions that happen inside living things.
The definition of catalysis
Consider a chemical reaction where a molecule A bonds with a molecule B to create a molecule A-B (A stuck to B). Under a given set of conditions --- the temperature the reaction occurs at, the pressure of the atmosphere, and the concentrations of the reactants A and B and the product A-B --- this reaction happens at a certain speed. For example, 3 A molecules and 3 B molecules become 3 A-B molecules each second.