BIOL 101 Final Quiz V3 | BIOL 101 Principles of
Biology | Actual Q&A with Rationale (BIOL101
Final Quiz) | Liberty University
1. What is the primary function of the plasma membrane in a eukaryotic cell?
A. To serve as the site of protein synthesis via ribosomes
B. To provide structural support and prevent the cell from bursting
C. To regulate the passage of molecules into and out of the cell
D. To store genetic information in the form of chromatin
Correct Answer: C
Explanation: The plasma membrane is a semi-permeable lipid bilayer that controls the
internal environment of the cell. It uses various transport proteins to maintain homeostatic
concentrations of ions and nutrients. This selective permeability is a fundamental
characteristic of all living cells as described in BIOL 101.
2. Which of the following processes occurs in the cytosol of the cell and does not require
oxygen?
A. The Electron Transport Chain
B. The Citric Acid Cycle
C. Glycolysis
D. Photosynthesis
,Correct Answer: C
Explanation: Glycolysis is the initial stage of cellular respiration where glucose is broken
down into two molecules of pyruvate. This process occurs in the cytoplasm and is
considered anaerobic because it does not require oxygen. It yields a net gain of two ATP
molecules and two NADH molecules per glucose.
3. In Mendelian genetics, what is the expected phenotypic ratio of a cross between two
individuals heterozygous for a single trait (Aa x Aa)?
A. 1:2:1
B. 3:1
C. 9:3:3:1
D. 1:1
Correct Answer: B
Explanation: When two monohybrid heterozygotes are crossed, the genotype distribution
is 1 AA, 2 Aa, and 1 aa. Because the dominant allele masks the recessive one, both AA and
Aa individuals display the dominant phenotype. This results in three individuals with the
dominant trait for every one individual with the recessive trait.
4. What is the role of tRNA during the process of translation?
A. It carries the genetic code from the DNA to the ribosome
B. It brings specific amino acids to the ribosome based on mRNA codons
, C. It serves as the structural component of the ribosome
D. It synthesizes the mRNA strand from a DNA template
Correct Answer: B
Explanation: Transfer RNA (tRNA) molecules are responsible for translating the genetic
message into a sequence of amino acids. Each tRNA molecule has an anticodon that pairs
with a specific mRNA codon. This ensures that the correct amino acid is added to the
growing polypeptide chain.
5. Which organelle is responsible for the final modification, sorting, and packaging of proteins
for export?
A. Smooth Endoplasmic Reticulum
B. Nucleolus
C. Lysosome
D. Golgi Apparatus
Correct Answer: D
Explanation: The Golgi apparatus acts as the shipping and receiving center of the cell. It
receives vesicles from the rough endoplasmic reticulum containing newly synthesized
proteins. The Golgi then modifies these proteins and sorts them for their final destinations.
Biology | Actual Q&A with Rationale (BIOL101
Final Quiz) | Liberty University
1. What is the primary function of the plasma membrane in a eukaryotic cell?
A. To serve as the site of protein synthesis via ribosomes
B. To provide structural support and prevent the cell from bursting
C. To regulate the passage of molecules into and out of the cell
D. To store genetic information in the form of chromatin
Correct Answer: C
Explanation: The plasma membrane is a semi-permeable lipid bilayer that controls the
internal environment of the cell. It uses various transport proteins to maintain homeostatic
concentrations of ions and nutrients. This selective permeability is a fundamental
characteristic of all living cells as described in BIOL 101.
2. Which of the following processes occurs in the cytosol of the cell and does not require
oxygen?
A. The Electron Transport Chain
B. The Citric Acid Cycle
C. Glycolysis
D. Photosynthesis
,Correct Answer: C
Explanation: Glycolysis is the initial stage of cellular respiration where glucose is broken
down into two molecules of pyruvate. This process occurs in the cytoplasm and is
considered anaerobic because it does not require oxygen. It yields a net gain of two ATP
molecules and two NADH molecules per glucose.
3. In Mendelian genetics, what is the expected phenotypic ratio of a cross between two
individuals heterozygous for a single trait (Aa x Aa)?
A. 1:2:1
B. 3:1
C. 9:3:3:1
D. 1:1
Correct Answer: B
Explanation: When two monohybrid heterozygotes are crossed, the genotype distribution
is 1 AA, 2 Aa, and 1 aa. Because the dominant allele masks the recessive one, both AA and
Aa individuals display the dominant phenotype. This results in three individuals with the
dominant trait for every one individual with the recessive trait.
4. What is the role of tRNA during the process of translation?
A. It carries the genetic code from the DNA to the ribosome
B. It brings specific amino acids to the ribosome based on mRNA codons
, C. It serves as the structural component of the ribosome
D. It synthesizes the mRNA strand from a DNA template
Correct Answer: B
Explanation: Transfer RNA (tRNA) molecules are responsible for translating the genetic
message into a sequence of amino acids. Each tRNA molecule has an anticodon that pairs
with a specific mRNA codon. This ensures that the correct amino acid is added to the
growing polypeptide chain.
5. Which organelle is responsible for the final modification, sorting, and packaging of proteins
for export?
A. Smooth Endoplasmic Reticulum
B. Nucleolus
C. Lysosome
D. Golgi Apparatus
Correct Answer: D
Explanation: The Golgi apparatus acts as the shipping and receiving center of the cell. It
receives vesicles from the rough endoplasmic reticulum containing newly synthesized
proteins. The Golgi then modifies these proteins and sorts them for their final destinations.
