Question 1

Indicate whether each of the following is fat soluble or water soluble.
-vitamin D

Accepted Answer

The answer of Indicate whether each of the following is...

Question 2

Penicillin functions as an antibiotic by

Accepted Answer

A) acting as an acetylcholinesterase inhibitor. 
B) poisoning bacteria with toxins. 
C) inhibiting the enzymes for cell wall formation in bacteria. 
D) bonding to metal ions in bacterial electron transport systems. 
E) raising the temperature of a bacterium. 
A) acting as an acetylcholinesterase inhibitor. 
B) poisoning bacteria with toxins. 
C) inhibiting the enzymes for cell wall formation in bacteria. 
D) bonding to metal ions in bacterial electron transport systems. 
E) raising the temperature of a bacterium.

Question 3

"Physiological conditions" for reactions within the body are approximately

Accepted Answer

A)    
B)    
C)  pH 7 and  273 K. 
D)    
E)    
A)    
B)    
C)  pH 7 and  273 K. 
D)    
E)

Question 4

Some insecticides kill insects by inhibiting the enzyme

Accepted Answer

A) penicillinase. 
B) lipase. 
C) acetylcholinesterase. 
D) creatine kinase. 
E) alcohol dehydrogenase. 
A) penicillinase. 
B) lipase. 
C) acetylcholinesterase. 
D) creatine kinase. 
E) alcohol dehydrogenase.

Question 5

"Physiological pH," the pH for optimum activity for most enzymes, is a pH equal to

Accepted Answer

A) 5.4. 
B) 8.6. 
C) 7.4. 
D) 3.0. 
E) 9.0. 
A) 5.4. 
B) 8.6. 
C) 7.4. 
D) 3.0. 
E) 9.0.

Question 6

The B vitamins are examples of

Accepted Answer

A) water-soluble vitamins. 
B) essential minerals. 
C) vitamins that are stored in the liver. 
D) essential amino acids. 
E) fat soluble vitamins. 
A) water-soluble vitamins. 
B) essential minerals. 
C) vitamins that are stored in the liver. 
D) essential amino acids. 
E) fat soluble vitamins.

Question 7

Which of the following is NOT a step in the enzyme-catalyzed conversion of a substrate to product?

Accepted Answer

A) A new substrate molecule binds to the enzyme for a new cycle. 
B) The product is released from the active site. 
C) The substrate binds in the active site to form the E-S complex. 
D) The enzyme assists in the conversion of the substrate to product. 
E) The substrate binds to the enzyme away from the active site. 
A) A new substrate molecule binds to the enzyme for a new cycle. 
B) The product is released from the active site. 
C) The substrate binds in the active site to form the E-S complex. 
D) The enzyme assists in the conversion of the substrate to product. 
E) The substrate binds to the enzyme away from the active site.

Question 8

How many steps are there in the reaction of an enzyme (E)with a substrate (S)to form and release the product (P)?

Accepted Answer

A) one 
B) two 
C) three 
D) four 
E) five 
A) one 
B) two 
C) three 
D) four 
E) five

Question 9

Indicate whether each of the following is fat soluble or water soluble.
-vitamin A

Accepted Answer

The answer of Indicate whether each of the following is...

Question 10

An enzyme that converts a cis double bond to a trans double bond is classified as a(n)________.

Accepted Answer

A) lyase 
B) transferase 
C) hydrolase 
D) isomerase 
E) oxidoreductase 
A) lyase 
B) transferase 
C) hydrolase 
D) isomerase 
E) oxidoreductase

Question 11

In an enzyme-substrate reaction, when excess substrate is present, increasing the concentration of the enzyme will

Accepted Answer

A) inhibit the formation of products. 
B) increase the decomposition rate of the enzyme-substrate complex. 
C) increase the amount of reaction occurring. 
D) decrease the turnover rate for the substrate. 
E) increase the number of substrate molecules available. 
A) inhibit the formation of products. 
B) increase the decomposition rate of the enzyme-substrate complex. 
C) increase the amount of reaction occurring. 
D) decrease the turnover rate for the substrate. 
E) increase the number of substrate molecules available.

Question 12

An increase in concentration of the enzyme LDH1 in the blood can be used to detect

Accepted Answer

A) anemia. 
B) bulimia. 
C) heart attack. 
D) uremia. 
E) kidney damage. 
A) anemia. 
B) bulimia. 
C) heart attack. 
D) uremia. 
E) kidney damage.

Question 13

Allosteric enzymes can control the output of product by

Accepted Answer

A) binding an irreversible inhibitor at the active site. 
B) binding a positive or negative regulator at a noncompetitive site. 
C) reversible inhibition using the product as the inhibitor. 
D) changing the pH in the active site. 
E) binding the substrate at a site away from the active site. 
A) binding an irreversible inhibitor at the active site. 
B) binding a positive or negative regulator at a noncompetitive site. 
C) reversible inhibition using the product as the inhibitor. 
D) changing the pH in the active site. 
E) binding the substrate at a site away from the active site.

Question 14

The creatine kinase   can be used in the diagnosis of

Accepted Answer

A)  hepatitis. 
B)  cancer. 
C)  prostatitis. 
D)  heart attack. 
E)  rickets. 
A)  hepatitis. 
B)  cancer. 
C)  prostatitis. 
D)  heart attack. 
E)  rickets.

Question 15

Coenzymes such as water-soluble vitamins are needed in only small amounts because

Accepted Answer

A) they can be stored in the liver for future use. 
B) only small amounts of enzymes are present in each cell. 
C) they can be eliminated in the urine. 
D) each vitamin molecule can be reused many times as a cofactor. 
E) only small amounts of substrates are available at any one time. 
A) they can be stored in the liver for future use. 
B) only small amounts of enzymes are present in each cell. 
C) they can be eliminated in the urine. 
D) each vitamin molecule can be reused many times as a cofactor. 
E) only small amounts of substrates are available at any one time.

Question 16

The function of the enzyme-substrate complex is to provide an alternative reaction pathway that

Accepted Answer

A) changes the concentration of the substrate. 
B) lowers the energy of the products. 
C) changes the possible product formed. 
D) decreases the activation energy for the reaction. 
E) lowers the energy of the substrate. 
A) changes the concentration of the substrate. 
B) lowers the energy of the products. 
C) changes the possible product formed. 
D) decreases the activation energy for the reaction. 
E) lowers the energy of the substrate.

Question 17

In the induced-fit model of enzyme action, the enzyme active site

Accepted Answer

A) stays the same shape while causing a change in the shape of the substrate. 
B) uses a cofactor to change the shape of a substrate. 
C) adjusts shape to adapt to the shape of the substrate. 
D) stays the same shape during substrate binding. 
E) uses an inhibitor to adjust its shape for the substrate. 
A) stays the same shape while causing a change in the shape of the substrate. 
B) uses a cofactor to change the shape of a substrate. 
C) adjusts shape to adapt to the shape of the substrate. 
D) stays the same shape during substrate binding. 
E) uses an inhibitor to adjust its shape for the substrate.

Question 18

Which of the following is NOT true for a competitive inhibitor?

Accepted Answer

A) It occupies the active site. 
B) It binds to the enzyme at a site remote from the active site. 
C) It has a structure similar to the substrate. 
D) It cannot be converted to products. 
A) It occupies the active site. 
B) It binds to the enzyme at a site remote from the active site. 
C) It has a structure similar to the substrate. 
D) It cannot be converted to products.

Question 19

A biological catalyst is called a(n)________.

Accepted Answer

A) cofactor 
B) enzyme 
C) lipid 
D) substrate 
E) coenzyme 
A) cofactor 
B) enzyme 
C) lipid 
D) substrate 
E) coenzyme

Question 20

In the lock-and-key model of enzyme action, the enzyme active site is thought of as

Accepted Answer

A) an area of the enzyme that can adjust to fit the substrate shape. 
B) a lock that bars a noncompetitive inhibitor from reacting. 
C) a hydrophilic area on the enzyme surface. 
D) a rigid, nonflexible shape that fits the substrate exactly. 
E) a key-like shape that fits into a pocket of the substrate surface. 
A) an area of the enzyme that can adjust to fit the substrate shape. 
B) a lock that bars a noncompetitive inhibitor from reacting. 
C) a hydrophilic area on the enzyme surface. 
D) a rigid, nonflexible shape that fits the substrate exactly. 
E) a key-like shape that fits into a pocket of the substrate surface.

Exam 20: Enzymes and Vitamins

Indicate whether each of the following is fat soluble or water soluble. -vitamin D

Penicillin functions as an antibiotic by

"Physiological conditions" for reactions within the body are approximately

Some insecticides kill insects by inhibiting the enzyme

"Physiological pH," the pH for optimum activity for most enzymes, is a pH equal to

The B vitamins are examples of

Which of the following is NOT a step in the enzyme-catalyzed conversion of a substrate to product?

How many steps are there in the reaction of an enzyme (E)with a substrate (S)to form and release the product (P)?

Indicate whether each of the following is fat soluble or water soluble. -vitamin A

An enzyme that converts a cis double bond to a trans double bond is classified as a(n)________.

In an enzyme-substrate reaction, when excess substrate is present, increasing the concentration of the enzyme will

An increase in concentration of the enzyme LDH1 in the blood can be used to detect

Allosteric enzymes can control the output of product by

The creatine kinase can be used in the diagnosis of

Coenzymes such as water-soluble vitamins are needed in only small amounts because

The function of the enzyme-substrate complex is to provide an alternative reaction pathway that

In the induced-fit model of enzyme action, the enzyme active site

Which of the following is NOT true for a competitive inhibitor?

A biological catalyst is called a(n)________.

In the lock-and-key model of enzyme action, the enzyme active site is thought of as

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