Enzymes and Energy

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Question #1

Lingual lipase is an enzyme with a pH optimum near 5. The pH optimum of an enzyme usually reflects the pH of the body fluid in which the enzyme is found. Thus, this enzyme’s pH optimum is lower most enzymes in the body.

A TRUE

B FALSE

Question #2

Complete the sentences that describe how reactions follow, or do not follow, the lays of thermodynamics.
Yeast destroying energy when they break down fat _____________law of thermodynamics.

A violates the 1st

B violates the 2nd

C obeys the 2nd

D obeys the 1st

Question #3

Complete the sentences that describe how reactions follow, or do not follow, the lays of thermodynamics.
Yeast converting 100 kcal of starch into 100 kcal of fat _______________ law of thermodynamics.

A violates the 1st

B violates the 2nd

C obeys the 2nd

D obeys the 1st

Question #4

Complete the sentences that describe how reactions follow, or do not follow, the lays of thermodynamics.
Yeast breaking down starch into usable energy _______________ law of thermodynamics.

A obeys the 1st

B violates the 1st

C violates the 2nd

D obeys the 2nd

Question #5

Coenzymes NAD and FAD are found in the vitamins niacin and riboflavin. Why is it that excess amounts of these vitamins are removed from the body in the urine?

A They increase the energy levels in the body and become toxic waste so the body has to remove them in the urine.

B They are water-soluble vitamins and therefore not stored in the body.

C Because they are fat-soluble and the body is able to store them, which creates more urine.

D They speed up the metabolic reactions in the body therefore creating more urine.

Question #6

What additional test can be done for prostate cancer ________.

A AST

B CK

C PSA

D CPK

Question #7

Prostate cancer can lead to difficult with urination due to ________.

A decreased pH, which causes difficulty with urine release

B enlarged prostate, which compresses the urethra

Question #8

What condition does Tom’s elevated MB isoform of creatine phosphate suggest ________.

A jaundice

B renal disease

C heart attack

Question #9

Isoenzymes released from damaged tissue include MM, BB, and ________.

A LDH

B MB

C AST

D pH

Question #10

Elevated levels of acid phosphatase in the blood would indicate ________.

A pancreatitis

B cancer of the prostate

C myocardial infarction

D muscular dystrophy

Question #11

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

A Twice

B Many times

C Once

D Never

Question #12

How does sucrose change the configuration of sucrase?

A Sucrose binds to its active site on sucrase, changing the shape of sucrase enzyme.

B Sucrose destroys the sucrase enzyme when they collide randomly in the small intestine.

C Sucrase binds to its active site on the sucrose molecule, causing it to denature.

D Sucrose changes the pH in the small intestine, causing sucrase to denature.

Question #13

The function of sucrase is to ________.

A join glucose and fructose together to form sucrose

B form a disaccharide from a monosaccharide

C break sucrose into glucose and fructose

D break sucrose into hydrogen, oxygen, and carbon atoms

Question #14

Where is sucrase found in the human body?

A On the microvilli of the small intestine

B On the gastric surface

C In the liver

D In the pancreas

Question #15

An enzyme speeds up a chemical reaction in the cell, but can only be used once.

A TRUE

B FALSE

Question #16

An enzyme can only bind one substrate at a time.

A TRUE

B FALSE

Question #17

Which of the following correctly represents the mechanism of enzyme function (S = substrate, P = product, E = enzyme)?

A S + P -> E – P -> E + P

B E + P -> E – P -> E – S -> E + S

C E + S -> E – P -> E – S -> E + S

D E + S -> E – S -> E – P -> E + P

E E + P -> E – S -> E – P -> E + P

Question #18

The active site is a binding site for which of the following?

A Product

B Any other enzyme

C Substrate

D None of the choices are correct.

E Water

Question #19

Which type of organic compound are enzymes?

A Lipids

B Nucleic acids

C Steroids

D Proteins

E Carbohydrates

Question #20

Match the class of enzyme with its function: Rearranges the atoms in a molecule

A Phosphatase

B Isomerase

C Dehydrogenase

D Hydrolase

E Kinase

F Synthase

Question #21

Match the class of enzyme with its function: Adds phosphate groups

A Isomerase

B Dehydrogenase

C Kinase

D Hydrolase

E Phosphatase

F Synthase

Question #22

Match the class of enzyme with its function: Removes hydrogens

A Dehydrogenase

B Kinase

C Hydrolase

D Phosphatase

E Isomerase

F Synthase

Question #23

Match the class of enzyme with its function: Removes water to join molecules

A Isomerase

B Kinase

C Hydrolase

D Dehydrogenase

E Phosphatase

F Synthase

Question #24

Match the class of enzyme with its function:Removes phosphate groups

A Phosphatase

B Kinase

C Dehydrogenase

D Synthase

E Hydrolase

F Isomerase

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