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What is a nucleic acid? What is the nucleus and what is its function inside the cell?

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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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Presentation Transcript
slide1

What is a nucleic acid?

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

slide4

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
midlesson review

How many strands does DNA have?

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 – a sugar

Deoxyribose is the same for all nucleotides

DNA is made up of 3 parts
slide12

Every nucleotide has a phosphate group

These link the sugars together

slide13

Every nucleotide has a nitrogenous base

  • 4 kinds
    • Adenine
    • Guanine
    • Cytosine
    • Thymine
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
slide16

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?

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 chromatin

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 copies itself with the enzyme “polymerase”

  • DNA unzips, then both strands have matching nucleotides added to make a new strand
    • Known as semiconservative replication
DNA Replication
end of lesson review

Describe how DNA replicates

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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