What is a nucleic acid? What is the nucleus and what is its function inside the cell?. Griffith. Deoxyribonucleic Acid DNA is how your body stores information Most everything about you is determined, at least in part, by your DNA. DNA. DNA is double stranded DNA is wound up into a helix
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What is the nucleus and what is its function inside the cell?
DNA is how your body stores information
Most everything about you is determined, at least in part, by your DNADNA
DNA is wound up into a helix
Thus DNA is known as a double helixFeatures of DNA
Rosalind Franklin – used X-ray crystallography to take a picture of DNA
Francis Crick and James Watson are credited with the double helix model of DNA.Watson, Crick, Franklin
Each segment is a “nucleotide” picture of DNA
DNA has 4 kinds of nucleotidesDNA is divided into segments
How many strands does DNA have? picture of DNA
What does DNA store?
Where is DNA found in a cell?
What are the 3 parts of DNA?MIDLESSON REVIEW:
Deoxyribose picture of DNA – a sugar
Deoxyribose is the same for all nucleotidesDNA is made up of 3 parts
Every nucleotide has a phosphate group picture of DNA
These link the sugars together
The amount of adenine in a molecule of DNA always equals the amount of thymine
The amount of guanine in a molecule of DNA always equals the amount of cytosine.Chargaff’s Rule
An “A” on one strand always pairs with a “T” on the other strand.
A “G” on one strand always pairs with a “C” on the other strand.
Nitrogenous bases are held together by hydrogen bonds other strand.
It is only the order of the nitrogen bases that changeImportance of Nitrogen bases
What 3 things does all DNA contain? organisms
What are the 4 nitrogenous bases?
What is the function of the phosphate group in DNA?
What nitrogenous base does A pair with?
What nitrogenous base does C pair with?MIDLESSON REVIEW
When DNA coils around proteins it makes a substance called organismschromatin
When chromatin coils around itself it forms chromosomes
Prokaryotes have one circular chromosome
Eukaryotes have multiple linear chromosomes, located in the nucleusChromosomes
Describe how DNA replicates organisms
What is the enzyme needed for replication of DNA?
Where is DNA found in a eukaryote?
What does DNA store?End of lesson review