WGU C190 Intro to Bio Personal Practice Questions OA
Prep 2026 | Verified Answers | Exam Prep
1. Describe the role of cholesterol in the synthesis of important biological
molecules.
Cholesterol serves as a precursor for the synthesis of steroids and
fat-soluble vitamins, including vitamins A and D.
Cholesterol is primarily used for energy production in cells.
Cholesterol is a structural component of cell membranes only.
Cholesterol is involved in the synthesis of amino acids.
2. Describe the significance of chromosome condensation during cell division.
Chromosome condensation allows for the synthesis of proteins.
Chromosome condensation is crucial for ensuring that
chromosomes are properly segregated during cell division.
Chromosome condensation prevents DNA replication.
Chromosome condensation is irrelevant to cell division.
3. Describe the role of each component of a nucleotide in the structure of DNA
and RNA.
The sugar provides the backbone, the phosphate group links
nucleotides together, and the nitrogenous base carries genetic
information.
The sugar is a catalyst, the phosphate group is a structural
component, and the nitrogenous base is a transport molecule.
The sugar is involved in protein synthesis, the phosphate group stores
energy, and the nitrogenous base is a waste product.
, The sugar acts as an energy source, the phosphate group is a
signaling molecule, and the nitrogenous base is a structural
component.
4. One main function of phospholipids in cells is to:
Store and process genetic information
Be used to build functional polypeptides
Be converted into ATP for cellular energy needs
Catalyze chemical reactions
Create a membrane between cellular compartments
5. Describe how the sequence of nucleotides in DNA contributes to genetic
information.
The sequence of nucleotides is responsible for the structure of the
cell membrane.
The sequence of nucleotides encodes the genetic information by
determining the order of amino acids in proteins.
The sequence of nucleotides regulates the flow of ions in and out of
the cell.
The sequence of nucleotides provides energy for cellular processes.
6. If a drug were to inhibit DNA replication during the S phase, what would be
the immediate consequence for the cell cycle?
The cell would continue to grow without dividing.
The cell would immediately undergo cytokinesis.
The cell would enter apoptosis.
The cell would be unable to proceed to mitosis.
,7. If a mutation affects the carbohydrate components of a cell membrane, what
potential impact could this have on the cell's function?
Impaired cell communication and recognition
Enhanced structural integrity
Increased energy production
Improved transport efficiency
8. If a person's body has a deficiency in cholesterol, which of the following
substances might be affected due to its role as a precursor?
RNA
Cellulose
Glucose
Steroids
9. What role do carbohydrates play in cellular membranes?
Structural support
Energy storage
Cell recognition and signaling
Transport of substances
10. Describe the role of starch in seeds and how it contributes to energy
production.
Starch is a lipid that protects seeds from environmental damage.
Starch provides structural support to seeds and is not used for
energy.
, Starch is a protein that aids in seed germination.
Starch serves as an energy reserve in seeds, which can be
hydrolyzed to release glucose for metabolism.
11. What cellular structure is responsible for protein synthesis?
Endoplasmic reticulum
Nucleus
Mitochondria
Ribosome
12. What is the most abundant organic molecule found in plant cell walls?
Starch
Glucose
Cellulose
Chitin
13. Plants can enlarge (make bigger) their cells by...
making more organelles
expanding the cell walls
taking up more water in their large central vacuoles
all of the answers are correct
14. Describe the role of the RNA primer in the process of DNA replication.
The RNA primer provides a starting point for DNA polymerase to
synthesize new DNA strands.
Prep 2026 | Verified Answers | Exam Prep
1. Describe the role of cholesterol in the synthesis of important biological
molecules.
Cholesterol serves as a precursor for the synthesis of steroids and
fat-soluble vitamins, including vitamins A and D.
Cholesterol is primarily used for energy production in cells.
Cholesterol is a structural component of cell membranes only.
Cholesterol is involved in the synthesis of amino acids.
2. Describe the significance of chromosome condensation during cell division.
Chromosome condensation allows for the synthesis of proteins.
Chromosome condensation is crucial for ensuring that
chromosomes are properly segregated during cell division.
Chromosome condensation prevents DNA replication.
Chromosome condensation is irrelevant to cell division.
3. Describe the role of each component of a nucleotide in the structure of DNA
and RNA.
The sugar provides the backbone, the phosphate group links
nucleotides together, and the nitrogenous base carries genetic
information.
The sugar is a catalyst, the phosphate group is a structural
component, and the nitrogenous base is a transport molecule.
The sugar is involved in protein synthesis, the phosphate group stores
energy, and the nitrogenous base is a waste product.
, The sugar acts as an energy source, the phosphate group is a
signaling molecule, and the nitrogenous base is a structural
component.
4. One main function of phospholipids in cells is to:
Store and process genetic information
Be used to build functional polypeptides
Be converted into ATP for cellular energy needs
Catalyze chemical reactions
Create a membrane between cellular compartments
5. Describe how the sequence of nucleotides in DNA contributes to genetic
information.
The sequence of nucleotides is responsible for the structure of the
cell membrane.
The sequence of nucleotides encodes the genetic information by
determining the order of amino acids in proteins.
The sequence of nucleotides regulates the flow of ions in and out of
the cell.
The sequence of nucleotides provides energy for cellular processes.
6. If a drug were to inhibit DNA replication during the S phase, what would be
the immediate consequence for the cell cycle?
The cell would continue to grow without dividing.
The cell would immediately undergo cytokinesis.
The cell would enter apoptosis.
The cell would be unable to proceed to mitosis.
,7. If a mutation affects the carbohydrate components of a cell membrane, what
potential impact could this have on the cell's function?
Impaired cell communication and recognition
Enhanced structural integrity
Increased energy production
Improved transport efficiency
8. If a person's body has a deficiency in cholesterol, which of the following
substances might be affected due to its role as a precursor?
RNA
Cellulose
Glucose
Steroids
9. What role do carbohydrates play in cellular membranes?
Structural support
Energy storage
Cell recognition and signaling
Transport of substances
10. Describe the role of starch in seeds and how it contributes to energy
production.
Starch is a lipid that protects seeds from environmental damage.
Starch provides structural support to seeds and is not used for
energy.
, Starch is a protein that aids in seed germination.
Starch serves as an energy reserve in seeds, which can be
hydrolyzed to release glucose for metabolism.
11. What cellular structure is responsible for protein synthesis?
Endoplasmic reticulum
Nucleus
Mitochondria
Ribosome
12. What is the most abundant organic molecule found in plant cell walls?
Starch
Glucose
Cellulose
Chitin
13. Plants can enlarge (make bigger) their cells by...
making more organelles
expanding the cell walls
taking up more water in their large central vacuoles
all of the answers are correct
14. Describe the role of the RNA primer in the process of DNA replication.
The RNA primer provides a starting point for DNA polymerase to
synthesize new DNA strands.
