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Structure of DNA

what is in DNA
by

miguel sanchez

on 30 November 2012

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Transcript of Structure of DNA

Structure of DNA DNA Replication P and E DNA copy Prokaryotic DNA Replication Eukaryotic DNA Replication Replication in Living Cells Copying the code Components of DNA The Components of DNA The Structure of DNA Replication occurs in the S phase of the cell Cycle when the chromosomes are replicated.

Prokaryotic cells only have one DNA molecule while Eukaryotic cells can have a 1000 more.
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Eukaryotic chromosomes are made up of proteins tightly packed by DNA to form a substance called chromatin

Histones- proteins that wrap around chromatin Replication can start in multiple spots on the DNA molecule, separating until completely copied.

Damaged DNA may cause serous consequences when copied causing alteration of genes.

Once the cell enters prophase of mitosis where the chromosomes begin to go there separate ways and finally become two replicated cells after Anaphase DNA is a Nucleic Acid made up of nucleotides joined into long strands by covalent bonds Nucleotides are made up of three basic components:
deoxyribose (5- carbon sugar)
Phosphate group
Base
Adenine
Guanine
Cytosine
Thymine Double Helix explains why DNA can be copied (because each base can only pair up with the opposite side base).

Replication- The process before the cell divides that duplicates DNA before separating.

During replication the DNA strands will separate and create new complementary strands.

DNA Polymerase are special enzymes that join individual nucleotides to form new strands of DNA. DNA replication does not start until regulatory proteins attach to a single end of the chromosomes thus triggering replication.

Replication starts at a single point and separates in two different directions until the chromosome is copied.
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