QUESTION 1
1.
What type of energy is referred to as the “energy of motion”?
A. free energy
B. potential
C. heat
D. thermodynamic
E. kinetic
1 points
QUESTION 2
1.
Some enzymes, like threoinine dehydratase, change their shape on binding to a substrate, activator or inhibitor
resulting in a change in the activity of the enzyme. What term describes these enzymes?
A. non-competitive enzyme
B. competitive enzyme
C. inhibitor enzyme
D. activator enzyme
E. allosteric enzyme
1 points
QUESTION 3
1.
The standard free energy change for the hydrolysis of
concluded from this information?
A. The reaction is endergonic.
ATP to ADP + Pi
is –7.3 kcal/mol. What can be
B. The reaction requires energy.
C. The reaction will never reach equilibrium.
D. The free energy of ADP and phosphate is higher than the free energy of ATP.
E. The reaction is exergonic.
1 points
QUESTION 4
1.
What happens when ADP gains a phosphate to form ATP?
A. The reaction ends.
B. The ribose sugar loses an oxygen to become deoxyribose.
C. Free energy is released by the loss of a phosphate.
D. Chemical energy is converted to light energy.
E. Energy is consumed.
1 points
QUESTION 5
1.
Which of the following types of macromolecule include the enzymes?
A. proteins
B. sterols
C. triglycerides
D. carbohydrates
E. nucleotides
1 points
QUESTION 6
1.
What is the energy currency of a cell?
A. glycogen
B. ATP
C. glucose
D. triglycerides
E. proteins
1 points
QUESTION 7
1.
What are the molecules that are acted on by an enzyme called?
A. products
B. substrates
C. effectors
D. prosthetics
E. carriers
1 points
QUESTION 8
1.
Negative feedback in a sequence of chemical reactions involves a chemical that appears _______ in the sequence
and _______ reaction.
A. late;
inhibits a later
B. late;
activates an earlier
C. late;
inhibits an earlier
D. early;
inhibits a later
E. early;
activates a later
1 points
QUESTION 9
1.
Before ATP is split into ADP and Pi (= inorganic phosphate molecule), it holds what type of energy?
A. kinetic
B. potential
C. entropic
D. heat
E. enthalpic
1 points
QUESTION 10
1.
ATP can phosphorylate many different molecules. This means that ATP can
A. receive phosphate groups.
B. donate phosphate groups.
C. convert molecules to nucleic acids.
D. store a large amount of energy when hydrolyzed.
E. all of the above
1 points
QUESTION 11
1.
The change in free energy (delta-G) for a reaction is positive. What is true of this reaction?
A. It is a spontaneous reaction.
B. It would proceed very quickly.
C. It could drive an energy-requiring process.
D. It is endergonic reaction.
E. It is a very efficient reaction with no entropy.
1 points
QUESTION 12
1.
What describes the term “active site”?
A. It is the part of the enzyme that binds with a substrate.
B. It is the part of the substrate that binds with an enzyme.
C. It is the site where energy is added to an enzyme catalyst.
D. It is the site where enzymes are found in cells.
E. It is the point where amino acids are linked in proteins.
1 points
QUESTION 13
1.
What term best describes the sum total of all the chemical reactions that occur in a living cell?
A. metabolism
B. energetics
C. digestive power
D. entropy
E. activity
1 points
QUESTION 14
1.
In any system, the total energy includes usable and unusable energy. The unusable energy is a measure of the
disorder of the system. What term applies to this unusable energy?
A. entropy
B. enthalpy
C. thermodynamics
D. free energy
E. equilibrium
1 points
QUESTION 15
1.
What does the first law of thermodynamics state?
A. the universe becomes more orderly over time
B. there is an increase in disorder in the universe over time
C. combustion engines are 100% efficient
D. only eukaryotic cells can produce ATP
E. energy cannot be created or destroyed
1 points
QUESTION 16
1.
How do competitive inhibitors of enzymes work?
A. They increase the activation energy of the enzyme-catalyzed reaction.
B. They alter the shape of the enzyme.
C. They fit into the active site on the enzyme.
D. They change the enzyme into an inactive form.
E. They fit into a site other than the active site on the enzyme.
1 points
QUESTION 17
1.
What term applies to the process of building a protein by adding amino acids to the chain using covalent bonding?
A. hydrolysis
B. catabolism
C. plasmolysis
D. metabolism
E. anabolism
1 points
QUESTION 18
1.
What is the energy of activation of a reaction?
A. the net change in free energy
B. the energy input needed to reach the transition state
C. the difference in energy between substrate and product
D. the difference in energy between the transition state and the product
E. the equivalent to the free energy of ATP hydrolysis
1 points
QUESTION 19
1.
Which one of the following statements about the formation of a peptide bond is incorrect?
A. The reaction has a positive ΔG.
B. The reaction is spontaneous.
C. The reaction is endergonic.
D. The reaction is anabolic.
E. The reaction requires an energy input.
1 points
QUESTION 20
1.
Autotrophs typically obtain their carbon from:
A. CH4
B. sugars
C. carbohydrates
D. proteins
E. CO2