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Question		Answer
What is digestion? start learning		The process of breaking down large, insoluble food molecules into small, soluble molecules that can be absorbed into the bloodstream.
What is a biological catalyst? start learning		an enzyme that speeds up chemical reactions in living organisms without being used up.
What are enzymes made of? start learning		Proteins with a specific shape.
What is the active site? start learning		The part of an enzyme where the substrate fits and the reaction happens.
What is the lock and key theory? start learning		substrate fits into an enzyme’s active site because they have complementary shapes.
What is the mechanical digestion? start learning		The physical breakdown of food into smaller pieces.
What is chemical digestion? start learning		The breakdown of food using enzymes.
Why is increasing surface area important? start learning		A larger surface area allows enzymes to work faster because more particles are exposed.

Biology - The Digestive System