DNA Structure and Replication
DNA molecules can be tens of thousands of base pairs in length. Mistakes in DNA replication lead to mutation ,which may or may not be harmful to an organism. How does semi-conservative replication help prevent mutations during DNA replication?
Half of the strand is already correct and does not need correction
Replication of DNA four steps-Step 2
Step 2- strands of DNA seperate
Replication of DNA four steps-Step 3
Step 3- free nucleotides are attracted to exposed bases on the loose strands of DNA
Replication of DNA four steps-Step 4
Step 4- hydrogen bonds between nucleotides form
Replication of DNA four steps-Step 1
Step1-hydrogen bonds between nucleotides break
What kind of sugar is found in a nucleotide
deoxyribose
What type of biological molecule is DNA helicase?
enzyme
When one nucleotide contains cytosine , what type of base is the cytosine attached to on the opposite nucleotide strand?
guanine
What parts of the nucleotides make up the rungs of the ladder?
nitrogen bases
What are three parts of a nucleotide
phosphate,deoxyribose sugar and nitrogen containing base
What parts of the nucleotides make up the sides "backbone" of the ladder
phosphates and sugars
What is the role of DNA helicase in the replication of DNA?
splits apart the parent strand
Which nucleotide component contains nitrogen
the base
When one nucleotide contains adenine , what type of base is the adenine attached to on the opposite nucleotide strand?
thiamin
The two strands of DNA are held together with hydrogen bonds between the nitrogen bases.These are weak bonds between polar molecules. How many hydrogen bonds connect the two bases from the previous question
two