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Energy, Enzymes, and Metabolism (Grades 11-12)

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Energy, Enzymes, and Metabolism

What term describes the collective sum of all the chemical reactions within a living structure?
  1. energetics
  2. activity
  3. metabolism
  4. entropy
A plant makes food through photosynthesis and is then eaten by a deer. The deer uses the sugars from the plant to make energy for itself when it runs away from a wolf. Which pathway represents how energy is transformed in this scenario?
  1. light --> chemical --> mechanical
  2. chemical --> kinetic --> heat
  3. heat --> potential --> chemical
  4. mechanical --> heat --> potential
A change in                 is needed for there to be a change in free energy.
  1. entropy
  2. altitude
  3. pressure
  4. volume
Imagine that, in a closed system, there is an input of 1 kJ of light. The light energy is converted into glucose, then ATP, then into mechanical energy. Which statement about the amount of mechanical energy available is true?
  1. There is 1 kJ of mechanical energy available to do work.
  2. Entropy increases with each conversion, so less than 1 kJ is available.
  3. All the reactions involved are anabolic, so there is only 0.25 kJ of energy available.
  4. All the reactions are endergonic, so no mechanical energy is produced.
ATP, the energy molecule of the cell, is known to perform phosphorylation on many different molecules. What does this mean?
  1. ATP can receive many different phosphate groups.
  2. ATP can convert molecules into nucleic acids.
  3. ATP can donate phosphate groups to other molecules.
  4. ATP can release a large amount of energy when hydrolyzed.
The building up of molecules in a living system is called                         ,while the breaking down of molecules in living systems is called                           .
ZInc or iron ions that bind to enzymes and aid in their functioning are called                         .
The second law of thermodynamics states that the energy in the universe is constantly increasing.
  1. True
  2. False
Why is it possible for enzymatic reactions to become saturated as substrate concentrations increase?

What does an allosteric inhibitor do?
  1. It changes the shape of the enzyme.
  2. It increases the concentration of the products.
  3. It decreases the concentration of the inactive enzymes.
  4. It changes the shape of the substrate.
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