Biology 10-2 Review DNA Structure Work Sheet

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The % of adenine in DNA is?

= to the % of thymine

Nitrogenous Base

A base in DNA containing nitrogen and carbon

Complementary Base Pair

A pair of nitrogenous bases connected to each other by hydrogen bonds ex. A=T (2 bonds) and C=-G (3 bonds)

What are the 3 parts of a DNA nucleotide?

Deoxyribose sugar, phosphate group, nitrogenous base

Pyrimidine

a nitrogenous base with 1 ring of carbon and nitrogen atoms ex. thymine and cytosine

Purine

a nitrogenous base with 2 rings of carbon and nitrogen atoms ex. adenine and guanine

Which is NOT a correct structure of a DNA nucleotide?

adenine--ribose--phosphate

According to the base-pairing rules, guanine binds with?

cytosine

The 2 strands of a DNA molecule are held together by?

hydrogen bonds

How many rings do cytosine and thymine have?

one ring

The primary function of DNA in calls is to?

store info that tells the calls which proteins to make

Hydrogen bonds are what?

the weakest

How many rings do adenine and guanine have?

two rings


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