Biology 10-2 Review DNA Structure Work Sheet
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