WGU C190 Intro to Biology Practice Test Questions Latest
Update 2026 | Exam Prep | 100% Accurate Answers
1. What is the name of the molecule that encodes human insulin?
Triglyceride
RNA
Protein
DNA
2. What are the basic building blocks of molecules?
Cells
Organisms
Atoms
Tissues
3. Describe the structural composition of triglycerides and explain the
significance of each component.
Triglycerides are made of glucose and starch, which are
carbohydrates used for energy.
Triglycerides consist of amino acids and nucleotides, which are
essential for protein synthesis.
Triglycerides contain phospholipids and cholesterol, which are
important for cell membrane structure.
Triglycerides are composed of glycerol and three fatty acid chains,
where glycerol serves as the backbone and fatty acids provide
energy storage.
,4. Which characteristic of water allows this paper clip to float on the surface of
the water? Choose one.
Solubility
Expansion on freezing
Surface tension
Temperature stability
5. Describe the process of hydrolysis of a fat molecule and its significance in
biological systems.
The hydrolysis of a fat molecule produces glucose for immediate
energy.
The hydrolysis of a fat molecule breaks it down into glycerol and
fatty acids, which are important for energy storage and cellular
functions.
The hydrolysis of a fat molecule converts it into proteins for muscle
repair.
The hydrolysis of a fat molecule creates nucleic acids for genetic
information.
6. What property of water allows it to travel further up a capillary tube
compared to mercury?
Surface tension
Viscosity
Cohesion
Density
,7. A break in the continuity of water in xylem cells in a plant is:
Evaporation
Meniscus
Transpiration
Cavitation
8. A key factor in protein structure that contributes to enzyme function by
making it flexible is
the high energy of covlent peptide bonds connecting amino acids
only the double helical regions of RNA
the many weak H-bonds and ionic bonds stabilizing secondary and
tertiary structure that make proteins flexible
only the H-bonds that stabilize the alpha-helices in proteins
the high free energy bonds that are transferred to substrate to initiate
reactions
9. The general structure of a phospholipid is shown here. These lipids form lipid
bilayers in cell membranes. Which of the following best explains this
phenomenon?
They contain both a hydrophobic and hydrophilic component.
They contain both fats and oils.
They contain glycerol.
They contain both unsaturated and saturated fatty acids.
10. What are the three main components of a nucleotide?
Sugar, phosphate group, nitrogenous base
, Fatty acid, glycerol, phosphate group
Amino acid, peptide bond, carboxyl group
Glucose, ribose, deoxyribose
11. Describe the role of DNA in the context of genetic information and
inheritance.
DNA synthesizes proteins for cellular functions.
DNA stores genetic information that is passed on to the next
generation.
DNA regulates metabolic processes in the cell.
DNA provides structural support to the cell.
12. If a plant's ability to synthesize starch is impaired, what impact would this
have on its energy storage capabilities?
The plant would rely solely on proteins for energy.
The plant would produce more glucose for immediate energy.
The plant would have reduced energy storage capacity.
The plant would increase its lipid storage to compensate.
13. Which molecule is primarily responsible for the storage of genetic
information in organisms?
Protein
Lipids
DNA
RNA
Update 2026 | Exam Prep | 100% Accurate Answers
1. What is the name of the molecule that encodes human insulin?
Triglyceride
RNA
Protein
DNA
2. What are the basic building blocks of molecules?
Cells
Organisms
Atoms
Tissues
3. Describe the structural composition of triglycerides and explain the
significance of each component.
Triglycerides are made of glucose and starch, which are
carbohydrates used for energy.
Triglycerides consist of amino acids and nucleotides, which are
essential for protein synthesis.
Triglycerides contain phospholipids and cholesterol, which are
important for cell membrane structure.
Triglycerides are composed of glycerol and three fatty acid chains,
where glycerol serves as the backbone and fatty acids provide
energy storage.
,4. Which characteristic of water allows this paper clip to float on the surface of
the water? Choose one.
Solubility
Expansion on freezing
Surface tension
Temperature stability
5. Describe the process of hydrolysis of a fat molecule and its significance in
biological systems.
The hydrolysis of a fat molecule produces glucose for immediate
energy.
The hydrolysis of a fat molecule breaks it down into glycerol and
fatty acids, which are important for energy storage and cellular
functions.
The hydrolysis of a fat molecule converts it into proteins for muscle
repair.
The hydrolysis of a fat molecule creates nucleic acids for genetic
information.
6. What property of water allows it to travel further up a capillary tube
compared to mercury?
Surface tension
Viscosity
Cohesion
Density
,7. A break in the continuity of water in xylem cells in a plant is:
Evaporation
Meniscus
Transpiration
Cavitation
8. A key factor in protein structure that contributes to enzyme function by
making it flexible is
the high energy of covlent peptide bonds connecting amino acids
only the double helical regions of RNA
the many weak H-bonds and ionic bonds stabilizing secondary and
tertiary structure that make proteins flexible
only the H-bonds that stabilize the alpha-helices in proteins
the high free energy bonds that are transferred to substrate to initiate
reactions
9. The general structure of a phospholipid is shown here. These lipids form lipid
bilayers in cell membranes. Which of the following best explains this
phenomenon?
They contain both a hydrophobic and hydrophilic component.
They contain both fats and oils.
They contain glycerol.
They contain both unsaturated and saturated fatty acids.
10. What are the three main components of a nucleotide?
Sugar, phosphate group, nitrogenous base
, Fatty acid, glycerol, phosphate group
Amino acid, peptide bond, carboxyl group
Glucose, ribose, deoxyribose
11. Describe the role of DNA in the context of genetic information and
inheritance.
DNA synthesizes proteins for cellular functions.
DNA stores genetic information that is passed on to the next
generation.
DNA regulates metabolic processes in the cell.
DNA provides structural support to the cell.
12. If a plant's ability to synthesize starch is impaired, what impact would this
have on its energy storage capabilities?
The plant would rely solely on proteins for energy.
The plant would produce more glucose for immediate energy.
The plant would have reduced energy storage capacity.
The plant would increase its lipid storage to compensate.
13. Which molecule is primarily responsible for the storage of genetic
information in organisms?
Protein
Lipids
DNA
RNA
