Bacteria..

[grayfalcon89]

Here are four questions that I need help on.. I really can't think much..

 

Thank you very much for your help!

 

1.What unique ability to bacteria posses in regards to gaining additional DNA?

 

My answer: All cells are clones of each other, and all cells respond to environment in same way.

 

2. In the lab on simple staining, we pass the slide with bacteria through the fire. What was the purpose of it?

 

My answer: Since we want to observe the bacteria in the stain, we want to do it when it's killed --> and flame kills it.

 

3. In the lab on simple staining, some of the stain remain on the slide while the slide was rinsed. Why?

 

My answer: Some of the stain remained because bacteria absorbed them?

 

4. Why does word vaccine come from the Latin word for cow?

 

My answer: ?

[Dak]

heya

 

i think its the general policy of this site to not do peoples homework for them, but to give them pointers in the right direction instead (so you learn and stuff), so with that in mind, here are my pointers...

 

1/plasmids

2/i immagine that this one would be hard to find out: the answre is so they dont wash off (the heat fuses them to the slide, a prosess called 'fixing').

3/yup

4/Vaccinia virus

 

hope that helps, sorry their a bit cryptic, as i said cant do yer homework 4 ye, but these should give you enough information to find the answre yourself

[grayfalcon89]

Sorry..

 

I didn't mean to post homework but i wasn't on the class for the last question (latin one) and I wasn't sure for #1-3. I think I know now for #1-3.

 

Hmm.. Bit explanation for #4..

[Guest savoy7]

Jennings - cowpox was used to provide immunity to small pox.

 

variola vaccinia

[Primarygun]

Do virus possess DNA?

In my book, it didn't mention. In some other books, they just mention they possess RNA.

http://en.wikipedia.org/wiki/Virus

In this web site, DNA is supposed to be possessed by virus.

[Dak]

retroviruses contain RNA genomes, other viruses contain DNA genomes.

[grayfalcon89]

Thanks to all your replies, I found the answer for the Latin.

 

Just in case, this might be useful in the future to anyone , I'll post what I have.

 

*In 1796, a guy named Edward Jenner used the cowpox virus on human to build immunity for the smallpox. While doing this, he called the material he used vaccine, which came from Latin word vacca , meaning cow.