WorksheetsCellular Metabolism Quiz
Total questions: 24
Worksheet time: 33mins
What is meant by the "active site" of an enzyme?
What is the role of the allosteric site in enzyme regulation?
It binds to the substrate to initiate the reaction.
It is where the end product binds to inhibit the pathway.
It is the active site for substrate binding.
It converts the substrate into the end product.
What is the effect of feedback inhibition on the substrate?
The substrate binds more easily.
The substrate is unable to bind.
The substrate is converted into an intermediate.
The substrate is broken down.
What process converts light energy into chemical energy in the form of glucose?
Aerobic respiration
Glycolysis
Photosynthesis
Fermentation
What are inorganic substances that act as co-factors for enzymes?
Proteins
Lipids
Copper, iron, and zinc ions
Carbohydrates
What is feedback inhibition in metabolic pathways?
Activation of an enzyme by a substrate
Inhibition of an enzyme by a product of the pathway
Synthesis of a new enzyme
Degradation of the enzyme
The (a) affects how well metabolic pathways work: too little slows things down, while too much can cause problems. Some molecules regulate these pathways by binding to a (b) that is different from the active site ( (c) , this can either turn the enzyme on or off). When a product of the pathway binds to this site, it can stop the enzyme from working, which helps prevent the cell from making (d) of the product (this process is called (e) ).
(a) and photosynthesis are vital to the survival of organisms. These processes are tightly (b) to ensure they proceed efficiently without disruption. As both processes consist of many steps, each of which is catalysed by a specific (c) , one way organisms achieve this efficiency is to keep the chemical composition and conditions within cells relatively (d) .
Explain how temperature can affect enzyme activity.
Explain what an enzyme is.
What is metabolism?
The breakdown of food into waste
The sum of all chemical reactions in the body
The storage of energy as fat
Only the breakdown of glucose
Describe the difference between anabolic and catabolic reactions and give one example of each.
Compare aerobic and anaerobic respiration in terms of ATP yield and end products.
Why is the shape of an enzyme important to its function?
Which of the following best explains why enzymes are specific to their substrates?
They change shape permanently after one reaction
Their active site matches the shape of only one type of molecule
They are only found in certain cells
They work with all molecules equally well
During glycolysis, one molecule of glucose is converted into:
Two molecules of ATP
One molecule of carbon dioxide
Two molecules of pyruvate
One molecule of oxygen
Which factor does NOT directly affect enzyme activity?
Temperature
pH
Light intensity
Substrate concentration
Which of the following is a catabolic process?
Protein synthesis
Photosynthesis
Cellular respiration
DNA replication
What is the role of enzymes in metabolism?
They are used up during chemical reactions
They slow down metabolic reactions
They act as catalysts to speed up reactions
They store energy in chemical bonds
Which process occurs in the mitochondria and produces the most ATP?
Glycolysis
Fermentation
Electron transport chain
Photosynthesis
Explain what happens to the rate of enzyme activity if the pH is outside the optimal range.
Which molecule provides the main energy source for cellular metabolism?
DNA
ATP
Glucose
NADH
Which of the following best describes an anabolic reaction?
Breaking down molecules to release energy
Reactions that occur only in animals
Building larger molecules from smaller ones
Reactions that require no energy
