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A chemical found in the nucleus. DNA. What was the name of the scientist who worked with mice, and what did he discover? .

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PowerPoint Slideshow about 'A chemical found in the nucleus' - kirkan


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Presentation Transcript
slide4

Griffiths (1928): – he studied pneumonia in mice- he heated a deadly strain of pneumonia, injected it into the mice and they lived - the mice inherited material that transformed them permanently-he discovered that bacteria is capable of transferring genetic information

slide6

That DNA causes death NOT protein in viruses, and DNA is the genetic material that is responsible for being passed from one generation to the next.

slide12
1 - a ring shaped structure called deoxyribose2 – a phosphate group3 - they all have a single or double ringed nitrogenous base
slide14

1- it is not living2- it is not made up of cells3 - it needs a host to reproduce4 – it injects DNA into a host cell and “hijacks” a cell’s function5 – they cannot survive on their own

slide15
Name the scientists who discovered that viruses have protein coats that make up the outside shell, and DNA on the inside
slide16

Hershey and Chase (1952) by using radioactive materials to track a virus’ movement-protein never got into a cell-DNA was injected by the virus into the nucleus of a cell and took it over

slide22

Both are polymers:Deoxyribonucleic Acid – double helix that contains genetic codes to make RNARibonucleic Acid – 1/2 ladder that contains codes to sequence amino acids to make proteins (picture on next slide)

guanine and adenine have double rings longer thymine cytosine have single rings shorter
guanine and adenine have double rings - longerthymine + cytosine have single rings - shorter
slide28

What is it called when nucleotides are held together by covalent bonds that connect the sugar of one nucleotide to the phosphate group of another nucleotide

the pairing is due to size one long and one short and their ability to form hydrogen bonds
The pairing is due to size—one long and one short and their ability to form hydrogen bonds.
slide35

A complex of enzymes called helicase “unzip” the base pairs- this occurs very quickly and accurately, and always with the original set of DNA

slide36

During DNA copying the two strands of the helix separate. Each single strand acts as a “negative” producing a new complimentary strand. What is this called?