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the dna double helix is composed of two strands of dna; each strand is a polymer of dna nucleotides. each nucleotide consists of a sugar, a phosphate group, and one of four nitrogenous bases. the structure and orientation of the two strands are important to understanding dna replication. drag the labels to their appropriate locations on the diagram below. targets of group 1 can be used more than once.

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Each DNA strand is composed of nucleotides and has an orientation 5' to 3'. In the image  a) 5' end   /  b) hydrogen bond  / c) 3'  end /  d) deoxyribose sugar  /  e) nitrogenous base  /  f) phosphate group  /  g) 3'  end / h) 5' end

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In every DNA molecule we will find,

  • The original strand,
  • The complementary strand.

1) First, let us recognize the bases.

Nitrogenated bases are in pairs in the central region of the drawn molecule.

Nitrogenated bases that form nucleic acids correspond to purines and pyrimidines.

  • Adenine and guanine derive from purines,
  • Thymine and Cytosine derive from Pyrimidines.  

In the DNA molecule, Adenine (Purine) forms pairs with Timine (Pyrimidine), while Guanine (Purin) pairs with Cytosine.

2) Now, let us find the Hydrogen bonds

Nitrogenated bases are joint by hydrogen bonds, which are the red dots

  • Two hydrogen bonds join the A-T pair,
  • Three hydrogen bonds join the G-C.

3) The sugar and the phosphate group

  • the phosphate group ⇒ is the one in a yellow circle with a P in the center
  • the sugar ⇒  is the blue penthagon ring with an hydroxyl group

4) Now, let us recognize each of the strain extremes.  

  • One of the extremes has a phosphate group, which is named 5' extreme.
  • The other extreme has a hydroxyl OH, named 3' extreme.

Both of the strains are readen in the 5' to 3' direction.

According to this analysis,

a) 5' end

b) hydrogen bond

c) 3' end

d) deoxyribose sugar

e) nitrogenous base

f) phosphate group

g) 3' end

h) 5' end

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