DNA Structure . Essential Standard 3.1.1 - Explain the double-stranded, complementary nature of DNA as related to its function in the cell. . What is DNA?. DNA stands for D eoxyribo n ucleic A cid. DNA is a nucleic acid. Where is DNA located?.
3.1.1 - Explain the double-stranded, complementary nature of DNA as related to its function in the cell.
DNA stands for Deoxyribonucleic Acid.
DNA is a nucleic acid.
DNA is located in the nucleus of eukaryotic cells and in the nucleoid region of a prokaryotic cell.
DNA can not leave the nucleus!!!
Can you determine why?
Holds our genetic information.
Has the instructions for making proteins.
DNA’s structure is described as a double helix.
It shaped like a ladder that is twisted.
James Watson and Francis Crick are given credit for determining the structure of DNA.
Rosalind Franklin also did a lot of background work that Watson and Crick used to help determine the structure.
DNA is a nucleic acid. Nucleic acids are polymers.
Nucleic acids are made of monomers called nucleotides.
Nucleotides are made of a sugar, phosphate and a base.
The sugar and phosphate groups alternate on the outside of the strands.
The bases are bonded to the sugar.
The bases are located on the inside of the double helix.
The bases are held together by weak hydrogen bonds.
The strands of DNA are said to be anti-parallel.
DNA replication is when DNA makes an exact copy of itself.
Cells need two complete sets of DNA to
give to each of the daughter cells that
result when cells divide.
DNA replication occurs during the S phase
hydrogen bonds between the base pairs.
This causes the strands to split.
2. The building phase begins.
with their appropriate bases.
bonds between the base pairs.
known as semi-conservative.
strand from the parental DNA and one new strand.
DNA Replication Animation