Biology Final Chapter 6

In the example above, how does the final product of the pathway inhibit the pathway?

By binding to an allosteric site of the first enzyme in the pathway.

If product D is abundant, why is it preferable to inhibit E2 rather than E1?

E1 can only be regulate by B or E

Release of the last phosphate from ATP is endergonic.

False

When ATP is hydrolyzed to form ADP, the energy is released into the cytoplasm where enzymes use it to run endergonic reactions.

False

What happens when the coenzyme NAD+ gains an H atom?

It also gains an electron causing it to be reduced.

Based on the reaction in the animation, what can you say about the change in free energy of the cleavage of sucrose into glucose and fructose?

It is negative and the reaction is exergonic.

Based on the animation, which of the following observations is true?

The product from one reaction served as the substrate for the next reaction.

Once phosphates are released from ATP they can be added back in an endergonic reaction.

True

The creatine-Phosphate to creatine reaction has a ΔG of -11kcal/mole and thus can be used to generate ATP from ADP.

True

When ATP is used in a reaction, the last phosphate is transferred to the substrate.

True

Sucrase uses ____ to cleave sucrose into two monosaccharides.

Water

A hydrogen atom consists of

a proton and an electron.

The enzyme in the animation is most likely catalyzing _____.

an anabolic reaction.

Molecules are synthesized in _____ reactions.

anabolic

Molecules are broken down in _____ reactions.

catabolic

Anabolic reactions _____ NADH and ATP.

consume

How often can a sucrase molecule be used to hydrolyze sucrose?

many times

A E1 B E2 C ---> --->

only A as substrate

Cells obtain energy by ________ food molecules such as glucose.

oxidizing

Catabolic reactions ______ NADH and ATP.

produce

What is the ultimate source of most energy in the biosphere?

solar energy from the sun

Which of the following binds most tightly to the active site of an enzyme?

substrate

In feedback inhibition, the inhibitor of the biochemical pathway is often

the final product of the biochemical pathway.