Which Nitrogen Base Most Closely Resembles Cytosine And Why

Question: What chemicals make up the sides (or backbone) of the DNA molecule?

Answer: Deoxyribose and phosphate

Question: What chemical makes up the rungs (as if it were a ladder)?

Answer: The 4 nitrogen bases

Question: List the 4 nitrogen bases:

Answer: Guanine, cytosine, thymine, and adenine

Question: Which nitrogen base always pairs with guanine?

Answer: Cytosine

Question: Which nitrogen base always pairs with adenine?

Answer: Thymine

Question: Which nitrogen base most closely resembles cytosine and why?

Answer: Thymine because they are both pyrimidines.

Question: Which nitrogen base most closely resembles guanine and why?

Answer: Adenine because they are both purines.

Question: What are pyrimidines and purines?

Answer: Purines and Pyrimidines are nitrogenous bases that make up the two different kinds of nucleotide bases in DNA and RNA

Question: DNA vs. RNA…

Answer: While the sugar present in a RNA molecule is ribose, the sugar present in a molecule of DNA is deoxyribose. RNA uses uracil, when DNA uses thymine.

Question: The points on the nitrogen-bases (triangles sticking out of the end that bonds with the complementary base) represent the hydrogen bonds. Which base pair has more hydrogen bonds, adenine-thymine or guanine-cytosine?

Answer: Guanine-cytosine

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