Modern Biology 10-2 DNA Structure

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If 15% of the nucleotides in a DNA molecule contain guanine, what percentage of the nucleotides contain each each of the other three bases?

Since guanine and cytosine are complementary, another 15% of the nucleotides must contain cytosine. The remaining 70% of the nucleotides (100%-30%) must contain adenine and thymine in equal proportions (35% each), since they are complementary to each other

nitrogenous base

a base in DNA containing nitrogen and carbon

Purine

a nitrogenous base with two rings of carbon and nitrogen atoms. Examples may include adenine or ganine

Why is complementary base pairing important in DNA structure

because the hydrogen bonds between the bases hold the two strands of DNA together and because it serves as a way for DNA to replicate

According to the base-pairing rules, guanine binds with

cytosine

What are the three parts of the DNA nucleotide, and how are they connected to each other

deoxyribose sugar, a phosphate group, and a nitrogenous base. The phosphate group and the base are connected to different parts of the sugar

the percentage of adenine in DNA is

equal to the percentage of thymine

The two strands of a DNA molecule are held together by

hydrogen bonds

pyrimidine

nitrogenous base with one ring of carbon and nitrogen atoms. Examples may include cytosine or thymine

complementary base pair

pair of nitrogenous bases connected to each other by hydrogen

The primary function of DNA in cells is to

store information that tells the cells which proteins to make

How did X-ray diffraction photographs help Watson and Crick determine the structure of DNA

they showed that the shape of the DNA molecule was a double helix


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