Bio quiz 3
Bio Quiz: Test Your Knowledge on Enzymes and Metabolism
Challenge your understanding of enzymes, metabolic reactions, and energy transformations with our engaging bio quiz. This quiz is designed for students and enthusiasts alike, offering a comprehensive overview of crucial biological concepts.
Questions include:
- Enzyme activity and coenzymes
- ATP's role in cellular processes
- Photosynthesis and cellular respiration pathways
Coenzymes and/or cofactors are necessary for optimal enzyme activity.
True
False
Most cells use a tremendous amount of ATP
So our bodies therefore produce and maintain a huge amount of ATP in storage.
But the amount of stored ATP is not great because our body constantly generates ATP from ADP + P.
Mainly because ATP is not very efficient as an energy currency.
But only for chemical work; transport and mechanical work must use a different form of energy.
If an enzymatic reaction was controlled by feedback inhibition, we would expect it to stop
Only if the substrate was exhausted.
When the cofactors are exhausted.
When the product changed the pH.
As soon as a critical level of end product builds up.
Only if a metabolic poison is added.
Gasoline engines use energy more efficiently than cells.
True
False
The change in free energy of a reaction, delta G, is calculated by
Subtracting the free energy content of the products from that of the reactants.
Subtracting the free energy content of the reactants from that of the products.
Adding the free energy content of the products to that of the reactants.
The amount of free energy content of the reactants.
The amount of free energy content of the products.
A reaction is only considered an oxidation reaction when oxygen is involved.
True
False
The location in which the enzyme and substrate complexes is called the
Active site.
Inhibitor site.
Receptor site.
Enzyme-substrate complex.
Enzyme-inhibitor complex.
Enzymes have "specificity." This means that they
Have a preferred pH.
Have a preferred temperature.
Have a particular substrate.
Are only in certain cells.
Require ATP and cofactors in order to work properly.
What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?
An endergonic reaction
An exergonic reaction
A coupled reaction
A reversible reaction
Anabolism
When a kinase adds phosphates to an enzyme, it will only activate the enzyme.
True
False
The reason an increase in substrate concentration does not increase the reaction rate indefinitely is because
Eventually the enzyme will no longer recognize the substrate.
The active site will become saturated with substrate and the enzyme will not be able to go any faster.
Another enzyme will take advantage of the excess substrate and use it for a different reaction.
Enzymes cannot be used more than once in a reaction.
The enzyme will become denatured.
Will the reaction A + B turn into C spontaneously "move" forward if the free energy of A + B is 25 units and the free energy of C is 30 units?
Yes
No
What is the equation for photosynthesis?
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
Energy + 6CO2 + 6H2O → C6H12O6 → 6CO2 + 6H2O
Energy + C6H12O6 → 6CO2 + 6H2O
Energy + 6CO2 + 6H2O → C6H12O6 + 6O2
C6H12O6 + 6CO2 → 6O2 + 6H2O + energy
The metabolic pathways of photosynthesis and cellular respiration
Involve the same substrates and therefore the same enzymes.
Are exactly the same.
Involve oxidation reactions during photosynthesis and reduction reactions during respiration.
Involve oxidation reactions during respiration and reduction reactions during photosynthesis.
Both involve oxidation and reduction reactions.
The term metabolism refers to all of the chemical reactions that occur in a cell.
True
False
While science cannot describe "thinking" in physical terms, we are certain that the process involves metabolism inside brain cells. With positron emission tomography (PET scan), it is possible to inject short-lived isotopes and image the regions of the brain that have the most active metabolism during various mental activities. However
Thought cannot be linked to cell processes because energy is not related to matter.
Since thoughts can occur over and over, the requirement for a continual input of energy to prevent entropy does not apply to this cell activity.
The cellular energy expended in thinking must be less than the chemical bond energy supplied in food to these brain cells.
"thinking" is beyond the scope of science to study.
"thinking" is not a cellular process and therefore does not require energy.
Which statement most accurately describes the second law of thermodynamics?
Energy cannot be changed from one form to another without a loss of usable energy.
One usable form of energy can be completely converted into another usable form.
Energy cannot be created nor destroyed but it can be changed from one form to another.
Energy cannot be created or destroyed.
Energy can be created or destroyed but it cannot be transformed.
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