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Asked: 2022-04-13T05:46:20+00:00 In:

Describe the structure and complementary base pairing of DNA.

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Describe the structure and complementary base pairing of DNA.

  • A. DNA is made up of two strands that are twisted around each other to form a helix. Adenine pairs up with thymine and cytosine pairs with guanine. The two strands are anti-parallel in nature; that is, the 3’ end of one strand faces the 5’ end of other strand. Sugar, phosphate and nitrogenous bases contribute to the DNA structure.
  • B. DNA is made up of two strands that are twisted around each other to form a helix. Adenine pairs up with cytosine and thymine pairs with guanine. The two strands are anti-parallel in nature; that is, the 3’ end of one strand faces the 5’ end of other strand. Sugar, phosphate and nitrogenous bases contribute to the DNA structure.
  • C. DNA is made up of two strands that are twisted around each other to form a helix. Adenine pairs up with thymine and cytosine pairs with guanine. The two strands are parallel in nature; that is, the 3’ end of one strand faces the 3’ end of other strand. Sugar, phosphate and nitrogenous bases contribute to the DNA structure.
  • D. DNA is made up of two strands that are twisted around each other to form a helix. Adenine pairs up with thymine and cytosine pairs with guanine. The two strands are anti-parallel in nature; that is, the 3’ end of one strand faces the 5’ end of other strand. Only sugar contributes to the DNA structure.

♦ Relevant knowledge
DNA is composed of five chemical elements: C, H O, P, and N. DNA is a large molecular (macromolecule) with a multi-molecular structural structure that includes many nucleotide monmers.

DNA is a double-helix composed of two polynucleotide chain chains that spiral around an imaginary axis (right helix). 1 helix contains: – 10 nucleotides. – 34 Anstrons in length – 20 Anstrons at their largest.

– The consequences of the principle of complementaryity:

  •  If you know the order in which nucleotides are arranged in one strand, the order in which nucleotides are arranged in the other is also known.
  •  In DNA molecules: The ratio A+ T /G + X is a constant that is unique to each species.
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    Expert

    The correct answer is A. DNA is made up of two strands that are twisted around each other to form a helix. Adenine pairs up with thymine and cytosine pairs with guanine. The two strands are anti-parallel in nature; that is, the 3’ end of one strand faces the 5’ end of other strand. Sugar, phosphate and nitrogenous bases contribute to the DNA structure.

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