Multiple Choice Questions

Chlorophyll can be found in _____.
  • exergonic
  • Red ... Green
  • is unchanged
  • A and C
Enzymes work by _____.
  • reducing Ea (the energy of activation)
  • γ-phosphate (the terminal phosphate)
  • the products have less potential energy than the reactants
  • heat has been released to the environment
The graph presents three activation energy profiles for a chemical reaction (the hydrolysis of sucrose): an uncatalyzed reaction, and the same reaction catalyzed by two different enzymes. As the reaction progresses, energy rises and reaches the activation energy, then decreases to a value lower than in initial state. The activation energy for the uncatalyzed reaction is the greatest, for the reaction catalyzed by enzyme A it is lower, and the activation energy for the reaction catalyzed by enzyme B is the lowest.Rank these by reaction rate, as measured by the rate of product formation per unit time, from lowest reaction rate to highest reaction rate. To rank items as equivalent, overlap them.
  • (From lowest to highest) Uncatalyzed Reaction, Reaction catalyzed by enzyme A, Reaction catalyzed by enzyme B
  • Adenosine triphosphate (ATP) is the high-energy form of adenosine because it contains the most phosphate groups (three).
  • a catabolic pathway
  • ATP will not be produced because there is no ADP and inorganic phosphate in the solution.
An enzyme _____.
  • exergonic
  • is an organic catalyst
  • Energy of Activation
  • is unchanged
Energized electrons from ____ enter an electron transport chain and are then used to reduce NADP+.
  • B
  • E
  • C
  • A
_____ releases energy that is used to pump hydrogen ions from the stroma into the thylakoid compartment.
  • A
  • C
  • E
  • B
Which of these phosphorylates ADP to make ATP?
  • A
  • Protons
  • E
  • endergonic
Which of the following particles can pass through the ATP synthase channel?
  • The enzyme has an allosteric regulatory site.
  • P4 binds E1 and deactivates it.
  • endergonic
  • Protons
Which part of the adenosine triphosphate molecule is released when it is hydrolyzed to provide energy for biological reactions?
  • P4 binds E1 and deactivates it.
  • The enzyme has an allosteric regulatory site.
  • γ-phosphate (the terminal phosphate)
  • Photophosphorylation
As a result of its involvement in a reaction, an enzyme _____.
  • Red ... Green
  • Substrate
  • exergonic
  • is unchanged
Which of the following would be unlikely to contribute to the substrate specificity of an enzyme?
  • γ-phosphate (the terminal phosphate)
  • The enzyme has an allosteric regulatory site.
  • Protons
  • P4 binds E1 and deactivates it.
True or false? The region of ATP synthase that catalyzes the production of ATP from ADP and inorganic phosphate spans the chloroplast membrane.
  • True
  • False
Identifying the highest energy form of adenosine. Select the highest energy form of adenosine from the following images.
  • Adenosine triphosphate (ATP) is the high-energy form of adenosine because it contains the most phosphate groups (three).
  • The enzyme has an allosteric regulatory site.
  • γ-phosphate (the terminal phosphate)
  • ATP will not be produced because there is no ADP and inorganic phosphate in the solution.
Complete this vocabulary exercise relating to enzymes.Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column.
  • P4 binds E1 and deactivates it.
  • ATP will not be produced because there is no ADP and inorganic phosphate in the solution.
  • 1. An enzyme is DENATURED when it loses its native conformation and its biological activity.2. An enzyme is considered a CATALYST because it speeds up chemical reactions without being used up.3. An enzyme is considered SPECIFIC because of its ability to recognize the shape of a particular molecule.4. A COFACTOR, such as a vitamin, binds to an enzyme and plays a role in catalysis.5. When properly aligned, the enzyme and substrate form an enzyme-substrate (ES) COMPLEX.6. A substrate binds to an enzyme at the ACTIVE SITE, where the reaction occurs.7. In a catalyzed reaction a reactant is often called a SUBSTRATE.
  • The enzyme has an allosteric regulatory site.
_____ splits water into 1/2 O2, H+, and e- .
  • A
  • E
  • C
  • B
According to the chemiosmotic hypothesis, what provides the energy that directly drives ATP synthesis?
  • Proton Gradient
  • False
  • Photophosphorylation
  • Protons
The process of cellular respiration, which converts simple sugars such as glucose into CO2 and water, is an example of _____.
  • a catabolic pathway
  • Photophosphorylation
  • P4 binds E1 and deactivates it.
  • γ-phosphate (the terminal phosphate)
What is the correct label for "A"? (How Enzymes Work, Reactants and Products)
  • endergonic
  • Photophosphorylation
  • Protons
  • Energy of Activation
Which of the following statements is most likely to be true in the case of the feedback-regulated enzymatic pathway shown?
  • The enzyme has an allosteric regulatory site.
  • γ-phosphate (the terminal phosphate)
  • Protons
  • P4 binds E1 and deactivates it.
0 h : 0 m : 1 s

Multiple Choice Questions
Answered Not Answered Not Visited Correct : 0 Incorrect : 0