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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 a nucleic acid?

What is the nucleus and what is its function inside the cell?



Deoxyribonucleic Acid

DNA is how your body stores information

Most everything about you is determined, at least in part, by your DNA

DNA


Features of dna

DNA is double stranded

DNA is wound up into a helix

Thus DNA is known as a double helix

Features of DNA


Watson crick franklin

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


Dna is divided into segments

Each segment is a “nucleotide” picture of DNA

DNA has 4 kinds of nucleotides

DNA is divided into segments


Midlesson review

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:


Dna is made up of 3 parts

Deoxyribose picture of DNA – a sugar

Deoxyribose is the same for all nucleotides

DNA is made up of 3 parts


Every nucleotide has a phosphate group picture of DNA

These link the sugars together



Chargaff s rule

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.



Importance of nitrogen bases

The sugar and phosphates of DNA are the same for all organisms

It is only the order of the nitrogen bases that change

Importance of Nitrogen bases


Midlesson review1

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


Chromosomes

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 nucleus

Chromosomes


Dna replication

DNA Replication


End of lesson review

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


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