Molecular Biology- DNA Replication Short Quiz!

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  • 1/7 Questions

    The process that copies a DNA molecule:

    • Replication
    • Transformation
    • Base pairing
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About This Quiz

What do you know about DNA replication? If you have studied molecular biology, you must have come across this term. Well, for a short definition, when two DNA replicas are produced from a single DNA molecule, it's called DNA replication. So, if you about this process, can you answer these questions in this short quiz?

Molecular Biology- DNA Replication Short Quiz! - Quiz

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  • 2. 

    In DNA, the fit between thymine and adenine, and the fit between cytosine and Guanine is called:

    • Replication 

    • Transformation

    • Base pairing

    Correct Answer
    A. Base pairing
    Explanation
    Base pairing refers to the specific pairing of nucleotide bases in DNA. Adenine always pairs with thymine, and cytosine always pairs with guanine. This complementary base pairing is crucial for DNA replication and transcription, as it ensures that the genetic information is accurately copied and transferred. Therefore, base pairing is the correct term to describe the fit between thymine and adenine, and cytosine and guanine in DNA.

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  • 3. 

    An enzyme that joins individual nucleotides to produce a new strand of DNA:

    • Telomerase

    • DNA polymerase

    • Telomere

    Correct Answer
    A. DNA polymerase
    Explanation
    DNA polymerase is the correct answer because it is an enzyme responsible for the synthesis of new DNA strands. It catalyzes the addition of individual nucleotides to the growing DNA chain, using a template strand as a guide. Telomerase, on the other hand, is an enzyme involved in the maintenance and replication of telomeres, the protective caps at the ends of chromosomes. Telomeres themselves are repetitive DNA sequences that do not directly join nucleotides to produce new DNA strands.

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  • 4. 

    The first step in DNA replication is:

    • New bases are added following the rules of base pairing.

    • The strands of the DNA separate.

    • The DNA molecule resulting from replication has one original strand and one new strand.

    • None of the above.

    Correct Answer
    A. The strands of the DNA separate.
    Explanation
    During DNA replication, the first step is the separation of the two strands of the DNA molecule. This separation is facilitated by enzymes that break the hydrogen bonds between the base pairs, causing the double helix structure to unwind. Once the strands are separated, new bases are added to each strand following the rules of base pairing, where adenine pairs with thymine and guanine pairs with cytosine. This process results in the formation of two identical DNA molecules, each consisting of one original strand and one newly synthesized strand. Therefore, the correct answer is "The strands of the DNA separate."

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  • 5. 

    What enzyme associated with DNA replication connects Okazaki fragments?

    • DNA Primase

    • DNA Ligase

    • DNA Polymerase

    Correct Answer
    A. DNA Ligase
    Explanation
    DNA Ligase is the correct answer because it is the enzyme responsible for connecting or joining the Okazaki fragments that are formed during DNA replication on the lagging strand. Okazaki fragments are short segments of DNA that are synthesized in the opposite direction of the replication fork, and DNA Ligase plays a crucial role in sealing the nicks or gaps between these fragments by catalyzing the formation of phosphodiester bonds. This process ensures the continuous synthesis of the lagging strand during DNA replication. DNA Primase is responsible for synthesizing RNA primers, and DNA Polymerase is responsible for adding nucleotides to the growing DNA strand.

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  • 6. 

    What enzyme associated with DNA Replication produces an RNA Primer?

    • RNA Primase

    • DNA Primase

    • DNA Polymerases

    Correct Answer
    A. RNA Primase
    Explanation
    RNA primase is the correct answer because it is the enzyme responsible for synthesizing short RNA primers during DNA replication. These primers provide a starting point for DNA polymerases to attach and begin the synthesis of new DNA strands. DNA primase is not a valid option because it does not exist. DNA polymerases are involved in DNA replication but do not produce RNA primers. Therefore, RNA primase is the correct enzyme associated with DNA replication that produces an RNA primer.

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  • 7. 

    In eukaryotic cells, replication can begin at:

    • Hundred of places on the DNA molecule

    • Single starting point

    Correct Answer
    A. Hundred of places on the DNA molecule
    Explanation
    In eukaryotic cells, replication can begin at hundreds of places on the DNA molecule. This is because eukaryotic DNA is linear and much longer than prokaryotic DNA. The replication process involves the unwinding of the DNA double helix and the formation of replication forks. These replication forks can initiate at multiple sites along the DNA molecule simultaneously. This allows for faster replication and ensures that the entire DNA molecule is replicated efficiently.

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  • Mar 21, 2023
    Quiz Edited by
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  • Jan 28, 2021
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    Alfredhook3
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