Greippi

Very mystifying! How long is your insert/what's the total size of the vector? What cells are you using?

How did you calculate your ligation ratios?

Depends on the specific retrovirus as different ones have different preferred methods of infections. I'd say eye drops would probably be more effective than the oral route (unless there are oral lesions present). For example, the retrovirus HIV is transmitted more easily when there's access to the blood stream. Chance of infection orally is extremely low unless there are at least small cuts in the mouth.

Low IgM could be indicative of various issues (such as autoimmune disease), however obviously further investigation is needed to isolate the cause. However, your blood test could have been taken on a "bad" or "odd" day for you and the results may not be indicative of your "normal" IgM levels. Also, sometimes blood levels that fall outside the normal range are normal for that person (if not related to some sort of health problem). Your doctor should determine the next course of action, depending on how far outside the normal range your levels were, and your symptoms. It's highly unlikely to get a false nagative HIV result so I'm sure you're fine in that respect.

Enzymes are proteins, which have mass. Amount of protein in mg means the amount of enzyme in mg.

I have never heard of NaCl being used to adjust pH, if you're using pure NaCl then it definitely shouldn't affect pH. I mean, Cl- can act as a weak acid, and Na+ can be a weak base, but the effects in a solution like that are negligible. What is the solution for? The NaCl is most likely a vital ingredient, especially as it's in there at a not insignificant concentration! For pH-ing something like that I'd use HCl or NaOH. It's probably best to make up more than 3ml of your solution, as it's quite difficult to make up something like that in small volumes, especially as you have to pH it. So what, exactly are you stuck on when it comes to making up the solution? Do you know how to make up a solution of a certain molarity? Do you know your equations? Or are concentration calculations something you've never come across.

It really depends on whether you're considering going to university, it's perhaps best to keep that option open if you're not sure. These days, a lot of the most exciting science stuff is multidisciplinary. I did biology and chemistry (as well as history) for A-level, went on to do a degree in biochemistry and am now doing a PhD involving biology, chemistry, physics and engineering. I am very glad I kept my options open, and wish I'd been able to do maths or physics at A level. For now I'd say stick with what you love doing, but keep your options open. Unless you have other subjects you want to do, I'd say perhaps you should do all 3 sciences at AS level, and then when it comes to deciding what to continue on to A level you'll be able to make a more informed choice about what to pick. There are a whole host of career options available that you have probably never considered, and won't be able to know whether you'd like to do them until you're further on in your academic career. How about scientific research? During AS levels you'll learn which areas you find most interesting, and you'll learn what degree courses are be available.

Even if you would consider your finger to be "clean" there's still going to be bacteria living on it, so I wouldn't worry too much about your finger being in a dirty/clean state. Unless, of course, you've just washed with that antibacterial soap... Your equipment may be unsterile, but you can also implement other sterile technique - doing it around a bunsen flame, not opening the lid of the plate wider than needed, not breathing on the plate...

Seems obvious but don't forget to also remove the stop codon (from the gene of interest or the PTD, depending on which end of the protein you're attaching it to) otherwise you won't get a fusion protein. I almost made that mistake once because I am silly.

When making gels, I assume 1ml of water = 1g. So your answer would be correct.

What, specifically are you stuck on?

You might need an even higher temperature than you've been using. I recently had the same problem and had to go up to 72 degrees before it worked.

Sometimes chance encounters work because of the magic of the CHANCE part of the encounter. This will just take the fun out of everything.

I read something in New Scientist recently about green tea extract and red light being used to destroy the plaques in Alzheimers.

It's quite hard to suggest anything just on that information. Are there any other tests you are planning on doing? There's a lot of information online for various tests you can do.