Quiz 5 Enzymes and NADH

A hydrogen atom consists of_____.

A proton and an electron

NAD+ is made from niacin, a B vitamin. Based on the animation, if someone if deficient in niacin, what symptoms might they experience ?

A reduction in energy

Which of the following statements about enzymes is TRUE?

An enzyme can could a non spontaneous reaction to a spontaneous reaction so that anabolic processes will occur

NAD+ is a coenzyme for many enzymes involved in redox reactions. This means that ____.

Enzymes that use NAD+ as a coenzyme will not function properly if NAD+ is not available.

An enzyme catalyze a a chemical reaction in the cell but can only be used once. True or False?

False

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

It also gains an electron, causing it to be reduced

What can be said about the change in free energy if the cleavage of sucrose into glucose and fructose?

It's is negative and the reaction is exergonic.

Enzymes catalyze reactions by ____.

Lowering activation energy

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

Many times

Where is sucrase found in the human body ?

On the microvilli of the small intestine

Cells obtain energy by _____ food molecules such as glucose.

Oxidizing

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

Substrate

FAD is a coenzyme associated with the succinate dehydrogenase enzyme complex in the respiratory citric acid cycle and electron transport chain. Succinate dehydrogenase becomes reduced due to the oxidation of succinate. Which of the following would occur if the FAD coenzyme were not associated with succinate dehydrogenase?

Succinate Dehydrogenase would not oxidize succinate

What happens to sucrase when it binds to sucrose ?

Sucrase goes through a conformational change

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

The final product of the biochemical pathway.

An enzyme may catalyze a reaction by stressing or destabilizing the bonds of the substrates. This point in the enzymatic reaction is known as the ____.

Transition State

Whenever a molecule is oxidized, another molecule must be reduced. True or false ?

True

Sucrase uses ____ to cleave sucrose into two monosaccharides.

Water

Consider the biochemical pathway used to synthesize the amino acid proline. A large increase in the level of proline will most likely lead to ______.

a decrease in proline production