Question 1

Which compound will change the color of the IKI solution when present?&#10;A) fat&#10;B) glucose&#10;C) starch&#10;D) protein

Accepted Answer

Starch is the compound that will change the color of the IKI solution when present. IKI (iodine-potassium iodide) solution reacts with starch to form a blue-black complex. Neither fat, glucose, nor protein have the ability to form this complex with IKI solution.

Question 2

Which of the following compounds will result in a color change of a solution containing iodine potassium iodide (IKI)?&#10;A) protein&#10;B) fat&#10;C) glucose&#10;D) amylopectin

Accepted Answer

Amylopectin is a type of starch, and when it is present in a solution with iodine potassium iodide (IKI), it will cause a color change from brownish yellow to blue-black. This is due to the formation of a complex between the starch and the iodine, which absorbs light differently and gives the solution a different color. Glucose, protein, and fat do not have the same effect on IKI and will not cause a noticeable color change.

Question 3

What is a substance that increases the rate at which a chemical reaction will occur?&#10;A) substrate&#10;B) catalyst&#10;C) polysaccharide&#10;D) amylose

Accepted Answer

A substance that increases the rate of a chemical reaction is called a catalyst. A substrate is a substance on which an enzyme acts, and polysaccharide and amylose are types of carbohydrates and not related to increasing the rate of a chemical reaction.

Question 4

A young woman developed necrotizing enterocolitis,which required the removal of her small intestine.What is one of the enzymes that will no longer be present because of the removal of her small intestine?

A) amylase
B) maltase
C) maltose
D) amylose

Accepted Answer

Maltase is an enzyme that is abundant in the small intestine and is responsible for the breakdown of maltose, a disaccharide. Without a small intestine, the young woman will not have maltase present to break down maltose, which can lead to malabsorption and other nutritional deficiencies. Amylase and amylose are enzymes that are responsible for the breakdown of starch, which is primarily digested in the mouth and small intestine, but not exclusively in the small intestine.

Question 5

In the absence of maltase,what product will accumulate during the breakdown of starch?&#10;A) glucose&#10;B) maltose&#10;C) sucrose&#10;D) amylose

Accepted Answer

Maltose is the product of the breakdown of starch by amylase, and maltase is necessary to break down maltose into glucose. Therefore, in the absence of maltase, maltose will accumulate.

Question 6

Which of the following compounds will result in a positive Benedict's test?&#10;A) maltose&#10;B) fat&#10;C) starch&#10;D) protein

Accepted Answer

Benedict's test is a test for reducing sugars. Maltose is a reducing sugar, but fats, starches, and proteins are not. Therefore, only maltose will result in a positive Benedict's test.

Question 7

What is the name for a biological catalyst?&#10;A) enzyme&#10;B) active site&#10;C) polysaccharide&#10;D) substrate

Accepted Answer

Enzymes are biological catalysts that speed up chemical reactions in living organisms without being consumed or permanently altered in the process. They work by binding to a specific substrate at their active site, where they can modify the substrate's chemical bonds and convert it into a different molecule. Polysaccharides are complex carbohydrates, while a substrate is the molecule that is acted upon by an enzyme.

Question 8

Which enzyme initiates the chemical digestion of starch?&#10;A) dextrin&#10;B) amylase&#10;C) maltase&#10;D) amylose

Accepted Answer

Amylase is the enzyme that initiates the chemical digestion of starch by breaking down the long chains of carbohydrates into smaller molecules called maltose.

Question 9

What is the name for the location on an enzyme where a substrate binds?&#10;A) maltase&#10;B) amylase&#10;C) catalyst&#10;D) active site

Accepted Answer

The location on an enzyme where a substrate binds is called the active site.

Question 10

Breaking down maltose by maltase will produce which of the following sugars?&#10;A) sucrose&#10;B) glucose&#10;C) lactose&#10;D) amylose

Accepted Answer

Maltose is a disaccharide made up of two glucose molecules. Maltase is an enzyme that breaks down maltose into its two glucose components. Therefore, the breakdown of maltose by maltase will produce glucose, not sucrose or lactose, which are different types of disaccharides. Amylose is a type of starch, not a sugar.

Question 11

When starch is digested by amylase what is the first breakdown product?&#10;A) dextrin&#10;B) glucose&#10;C) amylose&#10;D) sucrose

Accepted Answer

The answer of When starch is digested by amylase what...

Question 12

Which of the following sugars is a disaccharide?&#10;A) maltose&#10;B) galactose&#10;C) fructose&#10;D) glucose

Accepted Answer

The answer of Which of the following sugars is a...

Question 13

________ is a reactant substance that is acted upon by a specific enzyme.&#10;A) Amylase&#10;B) A substrate&#10;C) Maltase&#10;D) A catalyst

Accepted Answer

The answer of ________ is a reactant substance that is...

Question 14

Which of the following compounds will result from the breakdown of starch in the presence of both amylase and maltase?&#10;A) fructose&#10;B) glucose&#10;C) lactose&#10;D) galactose

Accepted Answer

The answer of Which of the following compounds will result...

Question 15

The breakdown of amylopectin in the presence of amylase and maltase will result in which of the following products?&#10;A) galactose&#10;B) glucose&#10;C) sucrose&#10;D) fructose

Accepted Answer

The answer of The breakdown of amylopectin in the presence...

Question 16

Which of the following is a polysaccharide?&#10;A) starch&#10;B) glucose&#10;C) sucrose&#10;D) maltose

Accepted Answer

The answer of Which of the following is a polysaccharide?&#10;A)...

Question 17

A young man has a congenital inability to break down maltose.Which enzyme is he unable to produce?&#10;A) lactase&#10;B) glucose&#10;C) fructose&#10;D) maltase

Accepted Answer

The answer of A young man has a congenital inability...

Question 18

Starch is broken down into which of the following sugar moieties by amylase?&#10;A) galactose&#10;B) maltose&#10;C) lactose&#10;D) glucose

Accepted Answer

The answer of Starch is broken down into which of...

Question 19

Which of the following can be broken down chemically by amylase?&#10;A) lactose&#10;B) glucose&#10;C) amylopectin&#10;D) sucrose

Accepted Answer

The answer of Which of the following can be broken...

Question 20

Maltose is a disaccharide consisting of which of the following sugar moieties?&#10;A) galactose-glucose&#10;B) sucrose-sucrose&#10;C) lactose-lactose&#10;D) glucose-glucose

Accepted Answer

The answer of Maltose is a disaccharide consisting of which...

Deck 28: Actions of a Digestive Enzyme