BIOL 101 Week 6 Quiz V1 | BIOL 101 Principles of
Biology | Actual Q&A with Rationale (BIOL101
Week 6 Quiz) | Liberty University
1. Which of the following molecules serves as the primary template for the synthesis of
messenger RNA during transcription?
A. Transfer RNA (tRNA)
B. Deoxyribonucleic acid (DNA)
C. Ribosomal RNA (rRNA)
D. Polypeptide chain
Correct Answer: B
Explanation: DNA contains the genetic instructions used in the development and
functioning of all known living organisms. During the process of transcription, RNA
polymerase uses a specific strand of DNA to create a complementary strand of mRNA. This
step is critical because it moves the genetic information from the protected nucleus into the
cytoplasm for protein production.
2. In the DNA double helix, which nitrogenous base always pairs with Cytosine?
A. Guanine
B. Adenine
C. Thymine
,D. Uracil
Correct Answer: A
Explanation: Chargaff’s rules dictate that specific base pairing occurs in the DNA molecule
to maintain a constant width of the double helix. Guanine and Cytosine form three
hydrogen bonds between them, creating a stable interaction. This complementary base
pairing is essential for the high fidelity observed during DNA replication processes.
3. What is the specific role of DNA helicase during the process of DNA replication?
A. Unwinding the double helix by breaking hydrogen bonds
B. Synthesizing RNA primers
C. Adding new nucleotides to the leading strand
D. Joining Okazaki fragments together
Correct Answer: A
Explanation: DNA helicase is a vital enzyme that initiates replication by separating the two
strands of the parent DNA molecule. By breaking the weak hydrogen bonds between
nitrogenous bases, it creates the replication fork. This allows other enzymes, like DNA
polymerase, to access the individual template strands for synthesis.
4. During translation, which molecule is responsible for bringing specific amino acids to the
ribosome?
A. mRNA
, B. RNA polymerase
C. DNA
D. tRNA
Correct Answer: D
Explanation: Transfer RNA (tRNA) acts as the physical link between the mRNA codon and
the amino acid sequence of proteins. Each tRNA molecule contains an anticodon that is
complementary to a specific mRNA codon. This ensures that the correct amino acid is
added to the growing polypeptide chain in the order specified by the genetic code.
5. What characterizes a ‘frameshift’ mutation in a genetic sequence?
A. The insertion or deletion of nucleotides not in multiples of three
B. The substitution of one purine for another purine
C. A mutation that results in the same amino acid being produced
D. The inversion of a large segment of a chromosome
Correct Answer: A
Explanation: A frameshift mutation alters the reading frame of the genetic message, which
is typically read in triplets called codons. By adding or removing nucleotides, every
subsequent codon is shifted, leading to a completely different amino acid sequence. These
mutations are often highly detrimental to the resulting protein’s function and structure.
Biology | Actual Q&A with Rationale (BIOL101
Week 6 Quiz) | Liberty University
1. Which of the following molecules serves as the primary template for the synthesis of
messenger RNA during transcription?
A. Transfer RNA (tRNA)
B. Deoxyribonucleic acid (DNA)
C. Ribosomal RNA (rRNA)
D. Polypeptide chain
Correct Answer: B
Explanation: DNA contains the genetic instructions used in the development and
functioning of all known living organisms. During the process of transcription, RNA
polymerase uses a specific strand of DNA to create a complementary strand of mRNA. This
step is critical because it moves the genetic information from the protected nucleus into the
cytoplasm for protein production.
2. In the DNA double helix, which nitrogenous base always pairs with Cytosine?
A. Guanine
B. Adenine
C. Thymine
,D. Uracil
Correct Answer: A
Explanation: Chargaff’s rules dictate that specific base pairing occurs in the DNA molecule
to maintain a constant width of the double helix. Guanine and Cytosine form three
hydrogen bonds between them, creating a stable interaction. This complementary base
pairing is essential for the high fidelity observed during DNA replication processes.
3. What is the specific role of DNA helicase during the process of DNA replication?
A. Unwinding the double helix by breaking hydrogen bonds
B. Synthesizing RNA primers
C. Adding new nucleotides to the leading strand
D. Joining Okazaki fragments together
Correct Answer: A
Explanation: DNA helicase is a vital enzyme that initiates replication by separating the two
strands of the parent DNA molecule. By breaking the weak hydrogen bonds between
nitrogenous bases, it creates the replication fork. This allows other enzymes, like DNA
polymerase, to access the individual template strands for synthesis.
4. During translation, which molecule is responsible for bringing specific amino acids to the
ribosome?
A. mRNA
, B. RNA polymerase
C. DNA
D. tRNA
Correct Answer: D
Explanation: Transfer RNA (tRNA) acts as the physical link between the mRNA codon and
the amino acid sequence of proteins. Each tRNA molecule contains an anticodon that is
complementary to a specific mRNA codon. This ensures that the correct amino acid is
added to the growing polypeptide chain in the order specified by the genetic code.
5. What characterizes a ‘frameshift’ mutation in a genetic sequence?
A. The insertion or deletion of nucleotides not in multiples of three
B. The substitution of one purine for another purine
C. A mutation that results in the same amino acid being produced
D. The inversion of a large segment of a chromosome
Correct Answer: A
Explanation: A frameshift mutation alters the reading frame of the genetic message, which
is typically read in triplets called codons. By adding or removing nucleotides, every
subsequent codon is shifted, leading to a completely different amino acid sequence. These
mutations are often highly detrimental to the resulting protein’s function and structure.
