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Discovering the Structure of DNA quiz #2

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  • Which bases are found in a strand of DNA?
    The bases found in a strand of DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).
  • Rosalind Franklin is famous for which contribution to the study of DNA?
    Rosalind Franklin is famous for capturing Photo 51, an x-ray diffraction image that provided crucial evidence for the double helix structure of DNA.
  • What do DNA strands consist of?
    DNA strands consist of nucleotides, each comprising a phosphate group, a five-carbon sugar, and a nitrogenous base.
  • What did the structure of DNA’s double helix suggest about DNA’s properties?
    The double helix structure of DNA suggested that DNA could replicate and encode genetic information due to its complementary base pairing and antiparallel strands.
  • What was Friedrich Miescher's contribution to the discovery of the genetic code?
    Friedrich Miescher discovered nuclein, which was later identified as DNA, laying the groundwork for understanding the genetic code.
  • How is DNA structurally described?
    DNA is a double-stranded helix.
  • What is the twisted ladder shape of the DNA called?
    The twisted ladder shape of DNA is called a double helix.
  • What shape is DNA?
    DNA is shaped as a double helix.
  • What is a double helix?
    A double helix is the structure formed by two strands of DNA coiled around each other, resembling a twisted ladder.
  • What is the structural description of a DNA molecule?
    A double-stranded helix with antiparallel strands.
  • How does the double helix structure of DNA support its role in encoding the genome?
    The double helix structure allows for complementary base pairing, enabling accurate replication and encoding of genetic information.
  • Which of these are part of the Watson-Crick model of the structure of DNA molecules? A) Triple helix. B) Antiparallel strands. C) Base pairing between adenine and cytosine. D) Sugar-lipid backbone.
    B) Antiparallel strands.
  • What holds the bases together in the middle of a DNA strand?
    Hydrogen bonds hold the bases together in the middle of a DNA strand.
  • What is true about the strands of the DNA double helix?
    The strands are antiparallel.
  • Why are the strands of a DNA molecule said to be complementary?
    The strands of a DNA molecule are complementary because each base on one strand pairs with a specific base on the opposite strand: adenine with thymine and cytosine with guanine.
  • What is a characteristic of double-stranded DNA?
    It has a sugar-phosphate backbone.
  • Which structural feature does the DNA double helix lack?
    Triple helix structure.
  • What is the complementary DNA sequence to 5' TAGAC 3'?
    The complementary DNA sequence is 3' ATCTG 5'.
  • What is the twisted ladder shape of the DNA called? A) 3-D model. B) Nucleotides. C) Double helix. D) Single strand.
    C) Double helix.
  • Which describes the basic structure of DNA?
    The basic structure of DNA is a double helix with two antiparallel strands of nucleotides linked by hydrogen bonds.
  • What is the structure of DNA?
    A double helix with antiparallel strands.
  • What is a true characteristic of double-stranded DNA?
    It has a sugar-phosphate backbone.
  • Which function does DNA not perform?
    Translates proteins.
  • What was Rosalind Franklin’s contribution to Watson and Crick’s discovery of DNA structure?
    Rosalind Franklin's x-ray diffraction image, Photo 51, provided crucial evidence for the double helix structure of DNA, aiding Watson and Crick's discovery.
  • What is DNA?
    DNA, or deoxyribonucleic acid, is a molecule that carries genetic information in living organisms and is composed of two antiparallel strands forming a double helix.
  • What is a true characteristic of double-stranded DNA?
    It has a sugar-phosphate backbone.
  • What determines the primary structure of a DNA molecule?
    The primary structure of a DNA molecule is determined by the sequence of nucleotides.
  • Why do you think it is necessary to understand the base pairing rules for DNA?
    Understanding base pairing rules is necessary for accurate DNA replication and transcription, as it ensures the correct pairing of adenine with thymine and cytosine with guanine.
  • What are the components of DNA?
    Phosphate group, five-carbon sugar, and nitrogenous base.
  • Which sugar is found in the backbone of DNA molecules?
    The sugar found in the backbone of DNA molecules is deoxyribose.
  • Which of the four DNA strands match the strand in the diagram by base pairing?
    The matching DNA strand would have complementary bases: adenine pairs with thymine, and cytosine pairs with guanine.
  • What is the relationship between DNA and genetic information?
    DNA encodes genetic information through the sequence of its nucleotide bases, which determine the synthesis of proteins and the traits of an organism.
  • Which image correctly represents a strand of human DNA?
    An image of human DNA would show a double helix structure with two antiparallel strands of nucleotides.
  • In which way does DNA differ from RNA?
    DNA contains the sugar deoxyribose and the base thymine, whereas RNA contains the sugar ribose and the base uracil.
  • What is the structure of DNA in comparison to the RNA?
    DNA is a double-stranded helix, while RNA is typically single-stranded.
  • Before DNA was discovered, what was believed to be the genetic material?
    Before DNA was discovered, proteins were believed to be the genetic material due to their complexity and diversity.
  • What does DNA have that RNA does not?
    Thymine.
  • What is true about the strands of the DNA double helix?
    The strands are antiparallel.