Start Quiz: Biology 06 Metabolism MCQ Quiz OpenStax College

Question: An allosteric inhibitor does which of the following?

Choices:

Binds to an enzyme away from the active site and changes the conformation of the active site, increasing its affinity for substrate binding

Binds to the active site and blocks it from binding substrate

Binds to an enzyme away from the active site and changes the conformation of the active site, decreasing its affinity for the substrate

Binds directly to the active site and mimics the substrate

Question: Label each of the following systems as high or low entropy: i. the instant that a perfume bottle is sprayed compared with 30 seconds later, ii. an old 1950s car compared with a brand new car, and iii. a living cell compared with a dead cell.

Choices:

i. low, ii. high, iii. low

i. low, ii. high, iii. high

i. high, ii. low, iii. high

i. high, ii. low, iii. Low

Question: DNA replication involves unwinding two strands of parent DNA, copying each strand to synthesize complementary strands, and releasing the parent and daughter DNA. Which of the following accurately describes this process?

Choices:

This is an anabolic process

This is a catabolic process

This is both anabolic and catabolic

This is a metabolic process but is neither anabolic nor catabolic

Question: Which of the following is the best way to judge the relative activation energies between two given chemical reactions?

Choices:

Compare the ΔG values between the two reactions

Compare their reaction rates

Compare their ideal environmental conditions

Compare the spontaneity between the two reactions

Question: Energy is stored long-term in the bonds of _____ and used short-term to perform work from a(n) _____ molecule.

Choices:

ATP : glucose

an anabolic molecule : catabolic molecule

glucose : ATP

a catabolic molecule : anabolic molecule

Question: Consider a pendulum swinging. Which type(s) of energy is/are associated with the pendulum in the following instances: i. the moment at which it completes one cycle, just before it begins to fall back towards the other end, ii. the moment that it is in the middle between the two ends, iii. just before it reaches the end of one cycle (just before instant i.).

Choices:

i. potential and kinetic, ii. potential and kinetic, iii. kinetic

i. potential, ii. potential and kinetic, iii. potential and kinetic

i. potential, ii. kinetic, iii. potential and kinetic

i. potential and kinetic, ii. kinetic iii. kinetic

Question: The energy released by the hydrolysis of ATP is

Choices:

primarily stored between the alpha and beta phosphates

equal to -57 kcal/mol

harnessed as heat energy by the cell to perform work

providing energy to coupled reactions

Question: Which of the following is not an example of an energy transformation?

Choices:

Turning on a light switch

Solar panels at work

Formation of static electricity

None of the above

Question: Which of the following is not true about enzymes:

Choices:

They increase ΔG of reactions

They are usually made of amino acids

They lower the activation energy of chemical reactions

Each one is specific to the particular substrate(s) to which it binds

Question: Which of the following comparisons or contrasts between endergonic and exergonic reactions is false?

Choices:

Endergonic reactions have a positive ΔG and exergonic reactions have a negative ΔG

Endergonic reactions consume energy and exergonic reactions release energy

Both endergonic and exergonic reactions require a small amount of energy to overcome an activation barrier

Endergonic reactions take place slowly and exergonic reactions take place quickly

Question: Which of the following molecules is likely to have the most potential energy?

Choices:

sucrose

ATP

glucose

ADP