Biology & Geology 4 ESO (2011-12)

Bacteria… A huge world

alvarolafuente — Wed, 22 Feb 2012 14:49:19 +0000

Bacterias are prokaryote organism, that means they have not nucleus.

They are the mayority of cell in your body.

We can separate it in Bad and good:

Bad: tuberculosis, lyme disease (bacterial infections)

Good: yogurt, gut

We have a great quantity of bacterias in our body beacause:

1 human cell is 20 bacterias in us.

This is the quantity of human cells and bacterias in our body:

– 10 – 100 trillion human cells

– 200-2000 trillion of bacterias.

The main difference between Eukarya and Bacterias:

http://youtu.be/fZEmF1hzHIs

How are they?

How they reproduce—by binary fision:

The DNA breaks in two.

http://youtu.be/WYe0LWTyEJM

Mutations:

This consist of one bacteria pass to another one what the other do not have. So the get stronger:

You can see it in this video.

http://youtu.be/_75VW3zzQSc

Antibiotics:

They kill bacteria

They were discovered by Alexander Fleming

How he discovered them:

1^st:He used a Petri dish. He discovered that some kind of bacteria was growing inside.

2^nd:Later in one of his petri dishes, in the center was growing a mold, the fungi can not get close to them.

This substance was called PENICILLIN.

Now there are lots of Antibiotics coming from different sources.

http://www.slideshare.net/Alvarolafuente/bacterias-10676438

Protein syntesis

alvarolafuente — Thu, 09 Feb 2012 15:49:47 +0000

I’ve made this presentation about Protein Syntesis. I think it will help you.

Thanks for watching

INTERESTING WEB PAGE ABOUT GENES

cascusatomus — Tue, 07 Feb 2012 18:52:55 +0000

I have found an interesting webpage about genetic that could be useful for you.

http://http://ghr.nlm.nih.gov

DNA

fatucam — Sun, 05 Feb 2012 17:41:57 +0000

Deoxyribonucleic acid (DNA) is the genetic code which ensures that daughter cells inherit the same characteristics as the parent cells.
DNA is the code from which all protein is synthesised
All prokaryotic cells and eukaryote ones and some viruses have DNA( eukaryotic cells: in the nucleus, prokaryotic cells in the cytoplasm)
All DNA code is composed from four nucleotide bases, Adenine Cytosine, Guanine and Thymine.

DNA

alvarolafuente — Sun, 05 Feb 2012 12:21:41 +0000

This is a complet power-point made by me, it can make you understand how DNA is.

DNA by David Suescún

David SP — Fri, 03 Feb 2012 15:32:42 +0000

The chain of DNA is a sucesion of proteins that contains the information that characterist us. The DNA contains, for example if we have brown eyes or black hair, and also characterize you, yes the reader, you are also containing a chain of DNA telling your characteristics.

This is a video that show how DNA is press to make Mitosis.

DNA

DNA structure

Adrianhims — Thu, 02 Feb 2012 17:02:50 +0000

click in the following ling to se the DNA structure

http://www.johnkyrk.com/DNAanatomy.html

youtube.es/adrianhims

How we can see cells

elinana99 — Mon, 30 Jan 2012 18:46:13 +0000

http://www.dvolver.com/live/movies-675222

La Hora de José Mota- Mitosis

Adrianhims — Sat, 28 Jan 2012 15:43:00 +0000

En el minuto 1:49 podemos ver como punset habla sobre las celulas diploides.

Life on the Earth

carlitos10 — Thu, 26 Jan 2012 21:11:48 +0000

This video is the first electronic textbook of Apple

Video by Carlos