WGU C190 Intro to Biology Mock Practice Test 2026 |
Trusted Questions & Answers
1. What is one of the primary functions of collagen proteins in the body?
Storing genetic information
Catalyzing biochemical reactions
Providing structural support
Transporting oxygen in the blood
2. In a metabolic pathway, if a specific enzyme is inhibited, which type of
reaction would be most directly affected if the enzyme catalyzes the
breakdown of a substrate?
Dehydration synthesis
Catabolic reaction
Hydrolysis reaction
Anabolic reaction
3. Potassium is a + charged ion. Will it be attracted to the inside of the cell if the
cell is at its normal resting membrane potential?
Yes! + charges are attracted to negative charges!
No! + charges are attracted to positive charges!
4. The property by which a paper clip can float on the surface of a liquid or by
which grains of sand stick together from water is called
solifluction.
surface tension.
, liquefaction.
cohesion.
5. Sodium ions are single atoms. Why can't they simply diffuse through the cell
membrane's lipid bilayer?
None of the above are true
Sodium ions are covalently attached in groups of three, which are too
large to diffuse easily.
Ions do traverse the membrane easily, but the sodium-potassium
pump moves them back across.
Since they are charged, ions can't cross the hydrophobic center of
the membrane without a channel or pump.
6. Which molecule is primarily responsible for the storage of genetic
information in organisms?
Protein
Lipids
DNA
RNA
7. Describe the process of maltose hydrolysis and the significance of its
products.
Maltose is broken down into fructose and glucose, which are used for
cell signaling.
Maltose is transformed into fatty acids for membrane formation.
Maltose is hydrolyzed into two glucose molecules, which are
important for energy production in cells.
, Maltose is converted into starch, which stores energy.
8. If a person has a genetic mutation that affects collagen production, what
potential health issue might they face?
Increased blood clotting
Weakened connective tissues
Enhanced muscle growth
Improved immune response
9. What term describes the water-attracting part of a phospholipid molecule?
Fatty acid chain
Hydrophilic head
Hydrophobic tail
Glycerol backbone
10. ________is/are an important fuel source during long-duration activities.
Lipids
Vitamins and minerals
Carbohydrate
Protein
11. Describe the significance of the charge at the opening of a pore in attracting
potassium (K+) ions.
A positive charge repels potassium ions, preventing their entry into
the cell.
, A variable charge can either attract or repel potassium ions
depending on the concentration.
A negative charge at the pore opening attracts positively charged
potassium ions, facilitating their movement into the cell.
Neutral charges have no effect on the movement of potassium ions.
12. What is the primary role of proteins in ATP synthase?
To catalyze metabolic reactions.
To transport lipids across membranes.
To store genetic information.
To facilitate the synthesis of ATP.
13. Pepsin converts proteins into polypeptides.
true
false
14. The DNA molecule is made up of _____ strand(s) and the RNA molecule is
made up of ___strand(s).
2; 1
4; 2
1; 1
2; 4
15. Describe the main difference between naturally occurring fatty acids and
trans fats.
Trans fats are healthier than naturally occurring fatty acids.
Trusted Questions & Answers
1. What is one of the primary functions of collagen proteins in the body?
Storing genetic information
Catalyzing biochemical reactions
Providing structural support
Transporting oxygen in the blood
2. In a metabolic pathway, if a specific enzyme is inhibited, which type of
reaction would be most directly affected if the enzyme catalyzes the
breakdown of a substrate?
Dehydration synthesis
Catabolic reaction
Hydrolysis reaction
Anabolic reaction
3. Potassium is a + charged ion. Will it be attracted to the inside of the cell if the
cell is at its normal resting membrane potential?
Yes! + charges are attracted to negative charges!
No! + charges are attracted to positive charges!
4. The property by which a paper clip can float on the surface of a liquid or by
which grains of sand stick together from water is called
solifluction.
surface tension.
, liquefaction.
cohesion.
5. Sodium ions are single atoms. Why can't they simply diffuse through the cell
membrane's lipid bilayer?
None of the above are true
Sodium ions are covalently attached in groups of three, which are too
large to diffuse easily.
Ions do traverse the membrane easily, but the sodium-potassium
pump moves them back across.
Since they are charged, ions can't cross the hydrophobic center of
the membrane without a channel or pump.
6. Which molecule is primarily responsible for the storage of genetic
information in organisms?
Protein
Lipids
DNA
RNA
7. Describe the process of maltose hydrolysis and the significance of its
products.
Maltose is broken down into fructose and glucose, which are used for
cell signaling.
Maltose is transformed into fatty acids for membrane formation.
Maltose is hydrolyzed into two glucose molecules, which are
important for energy production in cells.
, Maltose is converted into starch, which stores energy.
8. If a person has a genetic mutation that affects collagen production, what
potential health issue might they face?
Increased blood clotting
Weakened connective tissues
Enhanced muscle growth
Improved immune response
9. What term describes the water-attracting part of a phospholipid molecule?
Fatty acid chain
Hydrophilic head
Hydrophobic tail
Glycerol backbone
10. ________is/are an important fuel source during long-duration activities.
Lipids
Vitamins and minerals
Carbohydrate
Protein
11. Describe the significance of the charge at the opening of a pore in attracting
potassium (K+) ions.
A positive charge repels potassium ions, preventing their entry into
the cell.
, A variable charge can either attract or repel potassium ions
depending on the concentration.
A negative charge at the pore opening attracts positively charged
potassium ions, facilitating their movement into the cell.
Neutral charges have no effect on the movement of potassium ions.
12. What is the primary role of proteins in ATP synthase?
To catalyze metabolic reactions.
To transport lipids across membranes.
To store genetic information.
To facilitate the synthesis of ATP.
13. Pepsin converts proteins into polypeptides.
true
false
14. The DNA molecule is made up of _____ strand(s) and the RNA molecule is
made up of ___strand(s).
2; 1
4; 2
1; 1
2; 4
15. Describe the main difference between naturally occurring fatty acids and
trans fats.
Trans fats are healthier than naturally occurring fatty acids.
