PuelloDiablo

In extremely rare cases I suppose different eyecolors could also result from the porson being a chimera.

Take some classes on evolution and genetics and then we'll talk. You don't seem to comprehend the most basic biological principals.

Hey guys, Have a question: when making transgenic animals, you use an resistance cassette for screening the cells(e.g. Neo = G418 resistance), you make chimeras and mate them with wt. I'm trying to understand an article I'm reading, where they remove the cassette by crossing the F1 generation with mice that has a special recombinase that will excise the cassette. Why do you even need to remove resistance cassettes? Would it matter if you just kept it in the germ line?

steriods...

Hey people, About to do my final in biochemistry and I was wondering whether anyone had a good memory trick to remember which amino acids are ketogenic and which are glucogenic? Thanks in advance EDIT: Also, if anybody has some pointers how to remember which aminoacids derrives from what precursor, please feel free to post them!

Well... first of all, I think you'd need it to be either in the cis or trans comformation to draw it. Secondly I think id' give it another name, because it's necessary to follow the longest carbon chain.. say 2,5-dimethyl-6-hexene. (z) or (e) means zuzammen or entgegen and is used to describe the conformation around a double bound if the are 3 or more groups around it. Normally you use cis-trans if there is are two groups and two hydrogen ions, but if there are more E-Z can be used to priotize the groups... can't remember the priority rules right now, but you can look it up in any textbook. The attached file shows trans-2,5-dimethyl-6-hexen (or trans-1,2-diisopropylethene)

kix, you're probably right. However, I would suggest that the reason vira don't attach to each other is not because of the existence of a surface protein, but the absence of one. Vira are very specific, thus only attacking host cells with surface proteins they can recognize. If these proteins are not present, the virus cannot attach.

I suppose you could check your local drugstore! In Denmark where I live, you can by these kits relatively cheap...

Although recent exiting research show that they actually can!(although not in great quantities).

Sex-linked traits are said to be linked because more males (XY) develop these traits than females (XX). This is because the females have a second X gene to counteract the recessive trait. Thus, the trait is more likely to be visible in the male. Sex-influenced traits are autosomal traits that are influenced by sex. If a male has one recessive allele, he will show that trait, but it will take two recessive for the female to show that same trait. One such gene is baldness.

Greyfalcon, resistance to malaria and SCA has nothing to do with the AB0 bloodtypes. Different bloodtypes simply mean different surface protein on the red blood cells. I'm not sure if this answers your question, because I'm not really sure if this was what you asked. Please rephrase if you'd like a more precise answer.

They can either get it from external sources, or they can synthezise it from simpler compounds.

Mosquito! Because it's very, very cool! It flies AND it has a skin-piercing sucker! It's a mean, green blood-sucking machine...

While archeal flagella probably uses ATP, the eubacterial flagellum is powered by a proton flow. This flow is generated by the cell itself through the electron transport chain.

Well, it's very different for the various types of molecular locomotion.First, it's important to understand that the locomotion organs are not single protein, but a system of proteins. Secondly, it differs from system to system what kind of energy is being used: for instance, the eubacterial flagellum for instance, utilizes a gradiant of protons to spin its filament, while cilia uses ATP for moving the dynein-arms. For extra info check: http://en.wikipedia.org/wiki/Flagella http://en.wikipedia.org/wiki/Cilium Well not really - you give the cells to little credit!