BIO CH 6 Q

All of the following statements about denaturation are true EXCEPT? Denaturation changes the shape of an enzyme. Denaturation prevents the enzyme from binding its substrate molecules efficiently. Denaturation occurs at temperatures above a certain point. Denaturation increases the rate of reaction.

Denaturation increases the rate of reaction.

A metabolic pathway involves two reactions, the first reaction which releases energy for a second reaction which requires energy. This is referred to as:

a coupled reaction

atp releases energy when -

a phosphate is removed

A biologist is studying the part of enzymes which bind to substrates. This scientist would be studying which of the following enzyme parts?

active site

A new antibiotic has been developed that will use competitive inhibitor enzyme inhibition. This means that the

antibiotic will compete with the substrate for active site on the enzyme.

rebuilding ATP from ADP+P is an exergonic reaction

false - endergonic

Which is true of the figure to the left as solar energy is used by plant cells to make sugar?

kinetic energy is transformed into potential energy

Which of the following statements about energy is FALSE?

when energy is transformed, all of its available to do work

The allosteric site of an enzyme is:

where a noncompetitive inhibitor attaches to halt enzyme action.

In the reaction A + B --> C + D, the reactant(s) is/are ______________.

A and B

There energy need to do mechanical, chemical and transport work in a cell comes directly from:

ATP

The optimum condition for an enzyme

Is where it works best

When the active site of enzymes has been filled and the maximum enzyme rate has been achieved, what effect will adding more substrate have on the rate of reaction?

It will have no effect

Which of the following is an example of potential energy?

a big piece of chocolate cake

If you wished to increase the rate of a chemical reaction catalyzed by an enzyme, you could do any of the following except: increase the temperature moderately increase the concentration of the enzyme increase the amount of substrate add a buffer to reach the optimum pH lower the temperature to freezing.

lower the temperature to freezing

The second law of thermodynamics states that:

no energy transformation is 100% efficient because some of the energy is lost as heat

Which of the following statements is NOT true of organisms and energy with respect to the First Law of Thermodynamics?

organisms create energy

Most human enzymes work best within the range of:

pH 6 - 8

As a rock rolls down a hill which of the following statements would best explain what is occurring?

potential energy decreases as kinetic energy increases

The speed of a reaction that involves an enzyme increases as ______.

substrate concentration increases

Which of the following statements about enzymes is NOT true?

they are consumed by a reaction

Enzymes speed up chemical reactions in which of the following ways?

they lower activation energy

Burning wood which releases heat and light would be an exergonic reaction.

true

The term "metabolism" refers to all of the chemical reactions that occur in a cell.

true