bio test 2

questions from

the online quizzes

In general, enzymes are what kinds of molecules?

proteins

Enzymes work by

reducing EA

an enzyme is what

an organic catalyst

What name is given to the reactants in an enzymatically catalyzed reaction?

substrate

As a result of its involvement in a reaction, an enzyme _____.

is unchanged

A(n) _____ reaction occurs spontaneously.

exergonic

Which of these reactions requires a net input of energy from its surroundings?

endergonic

In cells, what is usually the immediate source of energy for an endergonic reaction?

ATP

The reaction ADP + P --> ATP is a(n) _____ reaction.

endergonic

The energy for an endergonic reaction comes from a(n) _____ reaction.

exergonic

What is the fate of the phosphate group that is removed when ATP is converted to ADP?

It is acquired by a reactant in an endergonic reaction.

What is energy coupling?

the use of energy released from an exergonic reaction to drive an endergonic reaction

a_____ inhibitor has a structure that is so similar to a substrate that it can bond to the enzyme just like a substrate

competitive

a ______ inhibitor binds to a site on the enzyme that is not the active site

noncompetitive

Most cells cannot harness heat to perform work because

temperature is usually uniform throughout a cell.

If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to

add more of the enzyme.

If an enzyme is added to a solution where its substrate and product are in equilibrium, what will occur?

Nothing; the reaction will stay at equilibrium.

Select the correct statement about chemical energy, a term used by biologists to refer to potential energy available for release in a chemical reaction.

Light energy is converted to chemical energy during photosynthesis.

statements about the role of ATP in cell metabolism is true?

The energy from the hydrolysis of ATP may be directly coupled to endergonic processes by the transfer of the phosphate group to another molecule.

review ch 9 cellular respiration questions

mostly the video at the beginning