Question

- The Homework - Nudeotides Nucleic Acids Resources C DNA and RNA are structurally similar in some ways but different in others. Identify whether each of the statements applies to DNA, RNA, both RNA and DNA, or neither DNA nor RNA. 1. It can contain the purine guanine. 2. It can contain the pyrimidine uracil. 3. This contains the sugar 2'-deoxyribose. 4. In terms of base composition, SA =%C. 5. This contains the sugar ribose. 6. The bases are attached to sugars in a B-N-glycosidic linkage 7. It contains cqual amounts of purines and pyrimidines. & Sugars are connected with a 3-5 phosphodiether link about le mo r e U LOPE

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Answer 1

A DNA strand consist of four repeating units of nucleotides, the four nucleotides contain four different nitrogenous bases two from purine bases, and other two from pyrimidine bases. The nitrogenous base attached with a deoxyribose sugar, which is categorized in a pentose sugar, by glyosidic linkage, to form a nucleoside. Similarly, nucleotides of adenine, guanine, cytosine, and thymine will be formed in DNA. The RNA strand also consists of four different nitrogenous bases, only thymine is replaced by uracil and pentose sugar is also change in nucleosides which is attached by glyosidic linkage. Similarly, nucleotides of adenine, guanine, cytosine, and uracil will be formed in RNA Pentose sugar is categories as follows: Pentose sugar (DNA) (RNA) Deoxyribiose Ribiose Nitrogenous bases categories as follows: Pyrimidine Purine Cytosine Uracil Thymine Adanine Guanine Answers: 1. It can contain the purine bases: Both (DNA and RNA) 2. It can contain the pyrimidine uracil: RNA only 3. This contains the sugar 2'-deoxyribose: DNA only 4. In terms of base composition, % a=%c: Neither 5. This contains the sugar ribose: RNA only 6. The bases are attached to sugars through B-N-glycosidic linkage: Both (DNA and RNA) 7. It can contain equal amount of guanine and cytosine: DNA only 8. The bases are attached to sugars a-N-glycosidic linkage: Neither