AnswersPA Human Anatomy Physiology A 2026-2027 WHITE ICCatalysts

Catalysts — Unit test Answers

26 verified answers3 views
21
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Which type of protein will fight disease?

A
insulin
B
antibodies
C
ligaments
D
genes
22
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The carbon cycle ensures that carbon is not lost. Which is another important benefit of the carbon cycle?

T
The carbon cycle helps regulate Earth's temperature.
T
The carbon cycle ensures that living things have a continual source of hydrogen.
T
The carbon cycle helps transport nutrients in bodies of water.
T
The carbon cycle ensures that there is a continual supply of water.
23

Which type of molecule that can be found in living things lacks carbon atoms?

A
protein
B
carbohydrate
C
fat
D
water
24

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
25

What is the primary function of the carbon cycle?

A
recycling the supply of carbon on Earth
B
creating macromolecules
C
recycling the supply of water on Earth
D
creating fossil fuels
26

Which statement best describes the relationship between activation energy and rate of reaction?

A
Increasing the activation energy can increase the rate of a reaction.
B
Reducing the activation energy can increase the rate of a reaction.
C
Increasing the reaction energy does not alter the rate of reaction.
D
Reducing the activation energy can decrease the rate of a reaction.
27

In what form is carbon found in the atmosphere?

A
CO2
B
C6H12O6
C
H2O
D
ATP
28

Where is the greatest amount of the world’s carbon found?

A
atmosphere
B
seafloor sediments
C
ocean
D
plants and animals
29

Which element is found in both DNA and protein?

A
sulfur
B
sodium
C
nitrogen
D
chlorine
30

Which statement about enzymes is true?

A
An enzyme functions to decrease the rate of a chemical reaction.
B
Enzymes are proteins that function as catalysts in nonliving things.
C
Each enzyme can catalyze many different biochemical reactions.
D
Enzymes and substrates fit together like a lock and key.
31

What is the general term for any carbohydrate monomer?

A
glucose
B
polysaccharide
C
monosaccharide
D
fructose
32

What would most likely happen if an error occurred when RNA was receiving coding information?

A
Proteins would be formed incorrectly.
B
DNA would form incorrectly.
C
RNA could not form a correct blueprint.
D
The incorrect amino acid would form.
33

Which type of molecule that can be found in living things lacks carbon atoms?

A
protein
B
carbohydrate
C
fat
D
water
34

The diagram shows a type of lipid.Which type of lipid is shown?

Question illustration
A
a saturated phospholipid
B
a saturated triglyceride
C
an unsaturated phospholipid
D
an unsaturated triglyceride
35

After school, Kai feels hungry and tired. He finds some sugar cookies in the cabinet and finishes the whole package. Which statements best describe the role of glucagon and insulin in this scenario?

A
Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. Insulin was secreted after he ate the cookies because his blood glucose was high.
B
Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. Glucagon was secreted after he ate the cookies because his blood glucose was high.
C
Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, insulin from the cookies increased his blood sugar levels.
D
Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, glucagon from the cookies increased his blood sugar levels.
36

What would most likely happen if a person increased the amount of saturated fat in his or her diet?

A
The person's risk of cardiovascular disease would increase.
B
The person's risk of cardiovascular disease would decrease.
C
The person's bad cholesterol would decrease.
D
The person’s good cholesterol would increase.
37

Which type of protein will fight disease?

A
insulin
B
antibodies
C
ligaments
D
genes
38

Which statement best describes the relationship between photosynthesis and cellular respiration?

A
Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.
B
Photosynthesis is part of the carbon cycle, and cellular respiration is not.
C
Only plants perform photosynthesis, and only animals perform cellular respiration.
D
Photosynthesis releases carbon into the atmosphere, and cellular respiration removes carbon from the atmosphere.
39

What is a difference between starch and glycogen?

A
Starch stores energy, and glycogen provides structural support.
B
Starch is found in plants, and glycogen is found in animals.
C
Starch is composed of fructose, and glycogen is composed of glucose.
D
Starch is a monomer, and glycogen is a polymer.
40

Why do phospholipids form a bilayer in water?

A
The phosphate portions repel each other.
B
The hydrophilic and hydrophobic parts attract each other.
C
The phosphate portions attract water, and the lipid portions repel water.
D
The lipid portions attract water, and the phosphate portions repel water.

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