AnswersPA Human Anatomy Physiology A 2026-2027 WHITE ICCatalysts

Catalysts — Unit test Answers

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41
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Which carbohydrate can be used by the body as an immediate source of energy?

A
glucose
B
cellulose
C
chitin
D
glycogen
42
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Which is released during the formation of a peptide bond?

A
a five-carbon sugar
B
an amino group
C
an amino acid
D
a water molecule
43

A scientist is examining the role of an element found in fats and carbohydrates of living things. This element makes up 65% of human body mass. Which statement describes the element he is studying?

A
He is studying oxygen, which can also be found in proteins.
B
He is studying oxygen, which is the most abundant element in the atmosphere.
C
He is studying nitrogen, which can also be found in proteins.
D
He is studying nitrogen, which is the most abundant element in the atmosphere.
44

The table shows the energy that is stored in three types of organic molecules.Energy Storage in HumansWhat is the best conclusion based on this data?

Question illustration
A
Blood is a primary location for energy storage.
B
Fat molecules contain more energy-containing bonds than simple sugars.
C
A gram of glycogen has twice as much energy as a gram of fat.
D
The human body stores approximately 1,000 kcal of glucose.
45

The graph below compares the rates of reaction of a burning candle and an exploding firework.What can you conclude from the graph?

Question illustration
A
The reaction that causes a firework to explode requires less energy to start, and occurs more rapidly than the reaction that causes a candle to burn.
B
The reaction that causes a firework to explode requires less energy to start, and occurs less rapidly than the reaction that causes a candle to burn.
C
The reaction that causes a firework to explode requires more energy to start, and occurs less rapidly than the reaction that causes a candle to burn.
D
The reaction that causes a firework to explode requires more energy to start, and occurs more rapidly than the reaction that causes a candle to burn.
46

Which will increase the rate of a chemical reaction?

A
adding a catalyst
B
decreasing the pressure
C
decreasing the temperature
D
removing a catalyst
47

The carbon cycle ensures that carbon is not lost. Which is another important benefit of the carbon cycle?

A
The carbon cycle helps regulate Earth's temperature.
B
The carbon cycle ensures that living things have a continual source of hydrogen.
C
The carbon cycle helps transport nutrients in bodies of water.
D
The carbon cycle ensures that there is a continual supply of water.
48

What would most likely happen to a person who is not getting enough essential amino acids in his or her diet?

A
The body would synthesize the amino acids.
B
Muscle growth and repair would be limited.
C
Stored protein would break down.
D
The formation of proteins would increase.
49

A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas. Which group of statements best describe all of the materials he is using in the investigation?

A
They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter.
B
They are each made of matter. Some are compounds and some are elements. They all contain atoms.
C
They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms.
D
They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.
50

Which is one function of steroids?

A
waterproofing leaves and feathers
B
insulating and protecting bones and organs
C
serving as chemical messengers
D
providing energy storage
51

A student wants to create a liquid volcano. The student observes bubbles in the soft drink prior to opening it. The student first proceeds to open the soft drink bottle and place it on the floor.Next the student drops candy tablets into the drink at a continuous pace. The student notices a very powerful reaction in which the candies, still intact, are pushed out of the soda as the drink fizzes and starts to bubble.In this scenario, what would be the catalyst?

A
The candy tablets being added to the drink.
B
The gasses being released when the drink was first opened.
C
The liquid in the container.
D
The container that holds the liquid.

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