its direction and rate
Which of the following represents two general factors that determine the fate of a chemical reaction in living cells?
Water held behind a dam would best reflect ______.
All of the following have potential energy EXCEPT
energy cannot be created or destroyed.
According to the first law of thermodynamics
The amount of available energy that can be used to promote change do work is called
The reaction will yield energy and is spontaneous.
Which of the following is TRUE for a reaction that has a G < 0?
It has a change in free energy that is greater than 0.
Which is True of the following reaction: pi + ADP---->ATF?
A reaction that has a G = +8 kCal
Which of the following reactions would require the hydrolysis of at least two ATP molecules (G = -14.6 kCal) for it to occur?
. A chemical reaction that has a positive G is correctly described as
The reaction proceeds with a net release of free energy.
Which of the following is TRUE for ALL exergonic reactions?
Every chemical reaction must increase the total entropy of the universe.
Which of the following statements is a logical consequence of the second law of thermodynamics?
The substrate binds to the enzyme with low affinity.
Which of the following statements about enzymes is FALSE?
It lowers the energy barrier needed for reactants to achieve the transition state or lowers the energy of activation of a reaction.
How does an enzyme work to catalyze a reaction?
If one were to double the amount of enzyme in a reaction with an initial G of -5 kcal/mole, what would the G be?
prevent the substrate from binding the enzyme's active site.
Altering the three-dimensional structure of an enzyme might
reduced the energy of activation and increase the rate of a reaction.
The primary function of an enzyme or any biological catalyst is to
Add a catalyst.
How can one increase the rate of a chemical reaction?
Enzymes increase the rate of a reaction.
Which of the following statements regarding enzymes is true?
substrates bind to enzyme enzyme undergoes conformational changes substrates are converted to products products are released
Which of the following would best reflect the general steps of an enzyme-catalyzed reaction?
Which term most precisely describes the process of building larger molecules from smaller ones?
Its production requires an exergonic reaction.
Which of the following is NOT true for ATP?
They usually require an input of energy.
Which of the following statements about catabolic reactions is FALSE?
It is anabolic.
Which of the statements in INCORRECT about the following reaction? Phosphoenolpyruvate + ADP Pyruvate + ATP (G = -7.5 kcal/mole)
Both molecule A is oxidized and molecule B is reduced.
For the generalized equation Ae- +B-->A + Be-, where e represents an electron. Which of the following statements is TRUE?
Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?
The product of the pathway inhibits its own production by noncompetitively inhibiting the binding of a substrate to the active site of an enyzme within the metabolic pathway.
Which of the following statements about feedback inhibition in metabolic pathways is most CORRECT?
Increase the amount of substrate for the enzyme.
In the biochemical regulation of metabolic pathways, how would one overcome the effects of a competitive inhibitor on enzyme activity?
Which of the following structures or molecular machines is important for protein degradation in eukaryotes?
Ubiquitin recognizes improperly folded proteins and targets them for degradation.
Which of the following statements about ubiquitin is TRUE?
ubiquitin binds target protein protein directed to proteasome protein unfolds and enters proteasome protein digested amino acids are released and recycled
Which is the correct sequence of events for protein degradation in eukaryotes?
ribosomes and proteasomes
Which two are primary complexes for protein synthesis and degradation in eukaryotes?