conjugation
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Difference between binary fission and conjugation. Binary fission is the means by which a bacterial cell duplicates its components and divides into two cells. Conjugation is the transfer of genetic information from one bacterial cell to another by means of a conjugation pili. With binary fission you initially start out with one cell and end up with two. With conjugation no new cells are created, you start and end with two cells. Also, in binarny fission all genetic material is replicated (chromosome, plasmids, etc). In conjugation, not all genetic material is replicated and passed.
Similarities – both systems replicate at least a portion of DNA.
Written by rob on January 31st, 2010 with 3 comments.
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Written by rob on January 30th, 2010 with 4 comments.
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How might a cell protect itself from foreign DNA in light of: transformation, transduction, conjugation?
Can someone explain this in an easy to understand way? Thanks in advance!
The cell could attack them the way they do to virus by producing interferon.
This interferon should be something like a nuclease which would destroy the foreign DNA of whatever form
Written by rob on January 27th, 2010 with 1 comment.
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How might a cell protect itself from foreign DNA in light of: transformation, transduction, conjugation?
Can someone explain this in an easy to understand way? Thanks in advance!
The cell could attack them the way they do to virus by producing interferon.
This interferon should be something like a nuclease which would destroy the foreign DNA of whatever form
Written by rob on January 25th, 2010 with no comments.
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in bacteria?
Transformation: a bacterium acquires DNA from the environment;
Transduction: a virus infects a bacterium and some bacterial DNA is entrapped in the viral capside; this virus infects another bacterium and transfers the DNA of the previous bacterium;
Conjugation: a bacterium transfers DNA directly to another bacterium.
Once you have understood this, you can deepen your knowledge by studying from your book
Written by rob on January 17th, 2010 with 5 comments.
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these are tough, but if you like you can answer the following:
What type of commercial crops does Asexual Reproduction become important?
Sexual reproduction for animals can be explained in 3 ways. List the three ways
What is a polyp?
What are two important characteristics that accompany external fertilization?
thank you so much. I’ve tried researching them myself and it is very hard to get a correct answer.
I’m not a biology expert, but here is what I found on the web:
* Bacterial conjugation
It looks like antibiotic-resistant bacteria can be one example:
http://www.hhmi.org/biointeractive/animations/conjugation/conj_frames.htm
And if you go to the next site, scroll down to "Conjugation," it seems that E. coli is another example:
http://www.biologyreference.com/Ar-Bi/Bacterial-Genetics.html
* Asexual reproduction/commercial crops
It looks like some plants can be produced asexually, such as grapes that are grafted, or potatoes that can grow from small pieces of the original plant. But they are still looking for a way to asexually reproduce foods such as grains, corn, or rice, which would be able to feed more people:
http://www.biotech-info.net/looking_for_crops.html
* Sexual reproduction in animals
I’m not sure exactly what is being asked here…I’m guessing you are looking for internal, external, and in vitro, as discussed on this website:
http://www.scienceclarified.com/everyday/Real-Life-Biology-Vol-2/Sexual-Reproduction.html
* Polyp
A polyp can be an abnormal growth of tissue:
http://en.wikipedia.org/wiki/Polyp_(medicine)
or it can be an organism that has a sac-like body with tentacles near the mouth:
http://en.wikipedia.org/wiki/Polyp
*External fertilization
1) The sperm contacts the egg outside of the female’s body.
2) Requires male and female to release their gametes into the surrounding area (usually water).
http://en.wikipedia.org/wiki/External_fertilization
http://biology.about.com/od/genetics/a/aa040805a.htm
Good luck. I hope these are the right answers!
Written by rob on January 13th, 2010 with 1 comment.
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i Just need some examples, Wikipedia does show the conjugation but it does not teach how to use it.
if you cant answerer this can you leave some stuff in french, just simple words or pharses, with the english translation
Je lis beaucoup de romans. = I read a lot of novels
Tu ne lis que des Bandes Dessinées. = You only read Comic books
Il lit souvent à la bibliothèque. = He often read at the library
Nous lisons ensemble. = We read together
Vous lisez le journal. = You read the newspaper
Ils lisent toujours dans leur chambre. = They always read in their bedroom
I’m not sure if it’s what you asked for.
Written by rob on January 4th, 2010 with 5 comments.
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Written by rob on January 2nd, 2010 with no comments.
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I know that it will conjugate irreguraly like leer (with the y), but I think I remember something else about it being irregular…any help is greatly appreciated!
REÍR:
yo reí
tú reíste
él/ella/ud. rió
nosotros reímos
vosotros reísteis
ellos/ellas/uds. rieron
*The accents are important, that’s why it’s irregular
"RIÓ" -s/he laughed
"RÍO" I laugh (present tense)
Written by rob on January 1st, 2010 with 2 comments.
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It is the beginning of the sharing of genetic material between individuals … with sexual reproduction being the far more advanced version of this process.
The advantage is that there is a new source of genetic material, which speeds up the bacteria’s ability to adapt to changing environments, spread into new environments, deal with pathogens (like viruses, toxins), etc. Without this new source of genetic material, the only source of genetic material is random mutation.
To put it another way … an essential part of evolution by natural selection is *variation*. Bacterial conjugation provides a second source of variation besides mutation.
Written by rob on December 29th, 2009 with 2 comments.
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