WorksheetsMetabolism and Enzymes Quiz
Total questions: 20
Worksheet time: 10mins
What is the 'lock and key' hypothesis?
Enzymes are locked in place
Substrates fit into enzymes like keys fit into locks
Enzymes can change shape
Substrates are destroyed by enzymes
What is the effect of substrate concentration on enzyme action?
It always increases the reaction rate
It increases the reaction rate until a maximum level is reached
It has no effect
It decreases enzyme activity
How does temperature affect enzyme activity?
Higher temperatures always increase activity
Lower temperatures always decrease activity
Enzymes have an optimum temperature for activity
Temperature has no effect on enzyme activity
What is the effect of increasing enzyme concentration?
It decreases the reaction rate
It always decreases enzyme activity
It increases the reaction rate until substrate becomes limiting
It has no effect on the reaction rate
What is activation energy?
Energy required for muscle contraction
Energy stored in ATP
Energy released during a reaction
Energy needed to break bonds in substrates
What happens when pH levels are extreme for an enzyme?
Enzyme activity increases
Enzyme activity remains the same
Enzyme concentration increases
Enzyme denatures and loses function
What happens to enzymes at high temperatures?
They become more active
They denature and lose function
They increase in concentration
They produce more substrates
What is the optimum pH for pepsin?
8
2.4
6
7
What is the role of enzymes in biochemical reactions?
To slow down reactions
To increase the rate of reactions
To change the products of reactions
To provide energy for reactions
What is catabolism?
The storage of energy in cells
The conversion of light energy to chemical energy
The process of breaking down complex substances
The process of synthesizing complex molecules
What is metabolism?
The process of breaking down food
All chemical reactions in a living organism
The synthesis of proteins only
The conversion of energy into heat
What is the effect of enzyme concentration on reaction rate?
It always increases the reaction rate
It decreases the reaction rate
It increases the reaction rate until substrate becomes limiting
It has no effect
What suffix is commonly used in the naming of enzymes?
-ase
-ose
-ol
-ine
What is the role of immobilized enzymes?
To change the structure of substrates
To produce more enzymes
To increase resistance to changes in factors
To decrease reaction rates
What do enzymes primarily consist of?
Proteins
Nucleic acids
Lipids
Carbohydrates
What is the role of cofactors in enzyme activity?
They help enzymes function properly
They decrease reaction rates
They are not needed
They increase enzyme concentration
What is an intracellular enzyme?
An enzyme that is inactive
An enzyme that functions within the cell
An enzyme that is produced by bacteria
An enzyme secreted outside the cell
What is the primary function of enzymes in living organisms?
To transport nutrients
To act as catalysts for biochemical reactions
To provide energy
To store genetic information
What are the two types of metabolism?
Catabolism and anabolism
Photosynthesis and respiration
Oxidation and reduction
Fermentation and digestion
Which enzyme is used to make lactose-free milk?
Lactase
Protease
Lipase
Amylase
