draw a short segment of a single poly nucleotide strand including at list 3 nucleotides
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Definition
DNA and RNA are essential in making you you. But what makes DNA DNA? Well, DNA and RNA are made up of organic molecules of a particular composition called nucleotides. If you had a toy tower made of Legos, DNA would be the tower and nucleotides the individual Legos.
A polynucleotide, therefore, is a chain of nucleotides. RNA is a polynucleotide, and DNA is a pair of polynucleotides. In this lesson, we'll learn how nucleotides join together to make a polynucleotide strand.
Structure
Think of a string of flags - like Tibetan prayer flags or even the flags you might see at a car dealership. The string is like a backbone that holds the flags together. A polynucleotide has a backbone, too. This polynucleotide backbone is made of the sugar and phosphate parts of nucleotides, so we call it a sugar-phosphate backbone.

Just as a strand of flags can have a sequence - say 'red, red, blue, red, green...' a polynucleotide strand has a sequence of bases called nitrogenous bases. Instead of colors, the bases have different chemical names. In DNA, the bases are adenine, guanine, cytosine, and thymine. This means that a polynucleotide's sequence might look like:
ACGTCGTATATCGTAGCTGTCAGTCGAGTAC...
RNA's polynucleotides are a little different; instead of thymine, they have uracil. They also have a different type of sugar in their backbone.
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DNA and RNA are essential in making you you. But what makes DNA DNA? Well, DNA and RNA are made up of organic molecules of a particular composition called nucleotides. If you had a toy tower made of Legos, DNA would be the tower and nucleotides the individual Legos.
A polynucleotide, therefore, is a chain of nucleotides. RNA is a polynucleotide, and DNA is a pair of polynucleotides. In this lesson, we'll learn how nucleotides join together to make a polynucleotide strand.
Structure
Think of a string of flags - like Tibetan prayer flags or even the flags you might see at a car dealership. The string is like a backbone that holds the flags together. A polynucleotide has a backbone, too. This polynucleotide backbone is made of the sugar and phosphate parts of nucleotides, so we call it a sugar-phosphate backbone.

Just as a strand of flags can have a sequence - say 'red, red, blue, red, green...' a polynucleotide strand has a sequence of bases called nitrogenous bases. Instead of colors, the bases have different chemical names. In DNA, the bases are adenine, guanine, cytosine, and thymine. This means that a polynucleotide's sequence might look like:
ACGTCGTATATCGTAGCTGTCAGTCGAGTAC...
RNA's polynucleotides are a little different; instead of thymine, they have uracil. They also have a different type of sugar in their backbone.
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