demzz12

Enzymes catalyze chemical reactions by doing which of the following?

• Increasing the number of reactants available

• Decreasing the activation energy of the reaction

• Decreasing the number of products formed

• Increasing the amount of time needed to complete a reaction

Which of the following best describes the activation energy of a reaction?

• The amount of energy stored in the enzyme

• The amount of energy required for a reaction to start

• The amount of energy released from a chemical bond

• The amount of energy stored in the substrates

How can an active site best be described?

• The area within an organism where the most reactions take place

• The region of a substrate that binds to an enzyme

• The region of a substrate that forms chemical bonds

• A pocket on an enzyme where substrate binds

How do enzymes lower the activation energy of chemical reactions? Select all that apply.

• Bringing reactants closer to one another

• Bringing products closer together

• Orienting reactants correctly in space for chemical reactions to occur

• Increasing the number of reactants available

Which of the following reaction elements can be changed by an enzyme? Select all that apply.

• Activation energy

• The initial concentration of reactants

• The energy of the products of a reaction

• Time required for many reactions to occur

Enzymes decrease the activation energy of a reaction by______ to reactants and _________ the reaction. AFter the reaction has finished, the enzyme ______________

• binding to, catalyzing, remains uncharged

• separating, catalyzing, cannot catalyze reaction

• synthesizing, inhibiting, must always be reactive

• separating, inhibiting, must always be reactive

Endergonic reactions do which of the following? Select all that apply.

• Release energy

• Consume energy

• Are nonspontaneous

• Are spontaneous

Which two of the following apply to the products of an exergonic reaction?

• Are more ordered than the reactants

• Have less energy than the reactants

• Are less ordered than the reactants

• Have more energy than the reactants

Which of the following apply to some of the energy released by an exergonic reaction? Select all that apply.

• End up being stored into new chemical bonds

• Cease to exist after the reaction is complete

• Be lost to the environment in the form of heat

• Provide energy to drive an endergonic reaction

Endergonic and exergonic reactions are often coupled, with the energy released by the

____________ reaction used to power the

______ reaction.

• endergonic, exergonic

• exergonic, endergonic

• exergonic, endergenetic

• none of the above