Biology Test 2 - Ch.6 Flashcards
A covalent bond between two atoms represents what kind of energy?
potential energy
During a redox reaction the molecule that gains an electron has been..
reduced and now has a higher energy level.
An endergonic reaction has the following properties:
+(delta)G and the reaction is not spontaneous.
A spontaneous reaction is one in which..
the reactants have a higher free energy than the products
What is activation energy?
the energy required to initiate a chemical reaction
Which of the following is NOT a property of a catalyst?
a catalyst lowers the free energy of the reactants.
Where is the energy stored in a molecule of ATP?
in the bonds connecting the two terminal phosphate groups
Cells use ATP to drive endergonic reactions because..
energy released by ATP hydrolysis makes (delta)G for coupled reactions more negative
Which of the following statements is NOT true about enzymes?
enzymes make (delta)G for a reaction more negative
ATP hydrolysis has a (delta)G of -7.4 kcal/mol. Can an endergonic reaction with a (delta)G of 12 kcal/mol be “driven” by ATP hydrolysis?
No, the overall (delta)G is still positive
An outline auction site offers a perpetual-motion machine. You decide not to bid on this because..
the Second Law says that energy loss due to entropy will not allow for perceptual motion
Enzymes have similar responses to both changes in temperature and pH. The effect of both is on the..
three-dimensional shape of the enzyme
Feedback inhibition is an efficient way to control a metabolic pathway because the..
first enzyme in a pathway is inhibited by the end-product of the pathway
