Lesson 3: Enzymes and Metabolism Flashcards
Model and Function
What is an enzyme?
A biological catalyst that speeds up chemical reactions in organisms
True or False: Enzymes are consumed in the reactions they catalyze.
False
Fill in the blank: Enzymes work by lowering the __________ of a reaction.
activation energy
What is the active site of an enzyme?
Where the substrate binds to the enzyme.
Which of the following is NOT a factor that affects enzyme activity? A) Temperature B) pH C) Color D) Concentration of substrate
C) Color
What is metabolism?
All chemical reactions that occur in our organisms.
True or False
Metabolism consists of only catabolic reactions.
Catabolic: breaking down molecules
False
Short answer: What are the two main types of metabolic pathways?
Catabolism and anabolism.
Fill in the blank: Catabolic pathways break down __________ to release energy.
molecules
Which enzyme is responsible for breaking down starch into sugars?
Amylase
True or False: All enzymes are proteins.
True
Multiple choice: What is the effect of high temperatures on enzyme activity? A) Increase activity B) Decrease activity C) Denature the enzyme D) No effect
C) Denature the enzyme
What is a substrate?
A substrate is the molecule an enzyme acts on.
What is the enzyme-substrate complex:
When an enzyme binds to the it’s substrate.
Active energy definition
The energy needed to start a reaction
True or False: Enzymes can work with different types of chemical reactions
False
