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Practice - Nucleic Acids 2 quiz

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  • What do Chargaff's rules state about the amounts of purines and pyrimidines in double-stranded DNA?
    Chargaff's rules state that the amount of purines equals the amount of pyrimidines in double-stranded DNA.
  • Which bases pair together in double-stranded DNA according to Chargaff's rules?
    Adenine pairs with thymine, and cytosine pairs with guanine.
  • What is the significance of the major groove in DNA structure?
    The major groove is larger than the minor groove and is generally where proteins bind to DNA.
  • How does the minor groove differ from the major groove in DNA?
    The minor groove is smaller than the major groove and is less commonly used for protein binding.
  • What is a palindromic sequence in DNA?
    A palindromic sequence reads the same 5' to 3' on both strands of DNA.
  • Why are palindromic sequences important in molecular biology?
    They are recognized by restriction endonucleases for cutting DNA at specific sites.
  • What does it mean that DNA strands are antiparallel?
    It means one strand runs 5' to 3' while the other runs 3' to 5'.
  • How are the carbons in the sugar of a nucleotide numbered?
    The carbons are numbered as 1', 2', 3', 4', and 5', with the prime symbol indicating the sugar.
  • Where is the phosphate group attached in a nucleotide?
    The phosphate group is attached to the 5' carbon of the sugar.
  • What does 'deoxy' mean in the context of DNA nucleotides?
    It means the sugar lacks an OH group at the 2' carbon.
  • What is dCTP and what does the 'T' stand for?
    dCTP is deoxycytosine triphosphate, and 'T' stands for triphosphate, indicating three phosphate groups.
  • How are the three phosphates in dCTP named?
    They are named alpha, beta, and gamma phosphates.
  • What is the base numbering system in nucleotides?
    The base is numbered starting at a nitrogen atom, typically as 1, 2, 3, etc.
  • Why is the 2' carbon important in distinguishing DNA from RNA?
    DNA lacks an OH group at the 2' carbon, while RNA has it.
  • What is the role of dCTP in DNA synthesis?
    dCTP is a nucleotide used during DNA synthesis to ensure replication fidelity.