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DNA. Structure & Replication. Hydrogen bond (H-bonds). DNA Structure. thymine adenine cytosine guanine phosphate deoxyribose sugar. Sugar / phosphate “strand”. Nitrogenous base “rung”. DNA nucleotide. RNA nucleotide. Deoxyribose sugar. ribose sugar. Nitrogenous base (guanine).

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Presentation Transcript

DNA

Structure & Replication


Hydrogen bond

(H-bonds)

DNA Structure

thymine

adenine

cytosine

guanine

phosphate

deoxyribose sugar

Sugar / phosphate “strand”

Nitrogenous base “rung”

DNA nucleotide

RNA nucleotide

Deoxyribose sugar

ribose sugar

Nitrogenous base

(guanine)

Nitrogenous base

(uracil)

phosphate

phosphate


DNA Replication

Step 1: Hydrogen bonds

between complimentary

bases break

DNA “unzips”


DNA Replication

Step 2: DNA strands

pull apart from each other


DNA Replication

Step 3: DNA nucleotides in the cell

match up with each side of the

“unzipped” DNA

each “unzipped’ strands forms a

template for a new strand


DNA Replication

Step 4: Each “old’ strand

forms a template for a

“new” strand

two identical DNA

molecules form

“new” strand, identical

sequence to the original

“old” (original) strand


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