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DNA is comprised of four different types of . Each one is made up of a pentose , a group, and one of four . 2. Adenine, guanine, cytosine and thymine are . 3. Adenine and guanine, which have a nine-member double-ring, are called . 4. Cytosine and thymine, which have a six-member single-ring, are called .

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Answer:

1)  Nitrogenous bases

2) Nucleotides

3) Purines

4) Pyrimidines

Explanation:

1) Each one is made up of a pentose , a group, and one of four Nitrogenous bases

2) Adenine, guanine, cytosine and thymine are Nucleotides

3. Adenine and guanine, which have a nine-member double-ring, are called Purines

4. Cytosine and thymine, which have a six-member single-ring, are called Pyrimidines

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