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