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Introduction to DNA Replication quiz #2

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  • What is the role of enzymes in the DNA replication process?
    Enzymes play crucial roles in DNA replication, including unwinding the DNA helix, stabilizing single strands, synthesizing new DNA strands, and joining Okazaki fragments.
  • Where does DNA unwinding begin?
    DNA unwinding begins at the origin of replication, where specific proteins bind to initiate the process.
  • Which enzyme is responsible for creating a primer that allows the DNA replication process to start?
    The enzyme primase is responsible for creating RNA primers that provide a starting point for DNA synthesis.
  • Why is the new DNA strand complementary to the 3' to 5' strands assembled in short segments?
    The new DNA strand is assembled in short segments, known as Okazaki fragments, on the lagging strand because DNA polymerase can only synthesize DNA in the 5' to 3' direction.
  • Why do you think the eukaryotic DNA requires multiple origins of replication?
    Eukaryotic DNA requires multiple origins of replication to efficiently replicate its larger and more complex genome within a reasonable time frame.
  • What is false about DNA polymerase's direction of synthesis during DNA replication?
    DNA polymerase synthesizes DNA in the 5' to 3' direction, so the statement that it synthesizes DNA in the 3' to 5' direction is false.
  • Where does DNA replication take place in eukaryotic cells?
    DNA replication takes place in the nucleus of eukaryotic cells.
  • What type of biological molecule is DNA helicase?
    DNA helicase is an enzyme.
  • What is true about the DNA replication process in prokaryotes?
    Prokaryotic DNA replication is bidirectional.
  • Helicase unzips what in the DNA molecule?
    Helicase unzips the DNA double helix by breaking hydrogen bonds between the base pairs.
  • Why do eukaryotic cells have multiple origins of replication?
    Eukaryotic cells have multiple origins of replication to ensure the entire genome is replicated efficiently and quickly.
  • How does semi-conservative replication help prevent mutations during DNA replication?
    Semi-conservative replication helps prevent mutations by using each original strand as a template, ensuring accurate base pairing and reducing errors.
  • As DNA is replicated, what happens to the original strands?
    As DNA is replicated, the original strands separate and serve as templates for the synthesis of new complementary strands.
  • What catalyzes DNA synthesis?
    DNA polymerase catalyzes DNA synthesis by adding nucleotides to the growing DNA strand.
  • What is the first step in DNA replication?
    The first step in DNA replication is the unwinding of the DNA double helix at the origin of replication.
  • Which enzyme unzips the DNA double helix?
    Helicase is the enzyme that unzips the DNA double helix.
  • How is lateral gene transfer different from the gene duplication that occurs during cell division?
    Lateral gene transfer involves the transfer of genes between different species, while gene duplication during cell division involves copying genes within the same organism.
  • Where does DNA replication occur in a eukaryotic cell?
    DNA replication occurs in the nucleus of a eukaryotic cell.
  • Which enzyme creates a primer for DNA polymerase?
    Primase
  • What is the complementary base sequence of the DNA strand if the template strand reads TTGCACG?
    The complementary base sequence is AACGTGC.
  • Why is DNA replication said to be semi-conservative?
    DNA replication is semi-conservative because each new DNA molecule consists of one original strand and one newly synthesized strand.
  • What is the result of DNA replication?
    The result of DNA replication is two identical DNA molecules, each containing one original and one new strand.
  • DNA replication is said to be semiconservative. What does this mean?
    Semiconservative replication means that each new DNA molecule consists of one original strand and one newly synthesized strand.
  • What is true about DNA synthesis regarding primer requirement?
    DNA synthesis requires a primer.
  • What are the products of semiconservative replication for a double-stranded DNA molecule?
    The products are two double-stranded DNA molecules, each with one original and one new strand.
  • Which component is not involved during the formation of the replication fork?
    DNA polymerase
  • What is the first step in the process of DNA replication?
    The first step is the unwinding of the DNA double helix at the origin of replication.
  • When does DNA replication occur in a eukaryotic cell?
    DNA replication occurs during the S phase of the cell cycle in a eukaryotic cell.
  • What is semiconservative replication?
    Semiconservative replication is the process where each new DNA molecule consists of one original strand and one newly synthesized strand.
  • What is the function of topoisomerase?
    Topoisomerase relieves supercoiling ahead of the replication fork by cutting and rejoining the DNA strands.
  • What is the first step of DNA replication?
    The first step is the unwinding of the DNA double helix at the origin of replication.
  • What happens to Okazaki fragments in E. coli after their synthesis?
    They are joined by DNA ligase.
  • Which enzyme is responsible for unwinding the DNA double helix during replication?
    Helicase is responsible for unwinding the DNA double helix during replication.
  • Which enzyme is responsible for “unzipping” the DNA double helix?
    Helicase is responsible for unzipping the DNA double helix.
  • What can explain the remarkably high fidelity for DNA replication?
    The high fidelity of DNA replication is due to the proofreading ability of DNA polymerases and the complementary base pairing mechanism.
  • Which direction will the DNA travel towards during replication?
    DNA replication proceeds in the 5' to 3' direction.
  • What enzyme unzips the DNA?
    Helicase unzips the DNA by breaking hydrogen bonds between the base pairs.
  • Why is DNA replication considered semi-conservative?
    DNA replication is considered semi-conservative because each new DNA molecule contains one original strand and one newly synthesized strand.
  • When during the cell cycle is a cell's DNA replicated?
    A cell's DNA is replicated during the S phase of the cell cycle.