AFAIK they still retain their original names.

You have the Amino group, Carboxyl Group which are alternatively referred to as terminus (N-terminus, C-terminus) if they are at the first and last amino acid in the chain respectively.

Then you have the R group that is also attached to the alpha-carbon of the amino acid. There is a fourth bond on this alpha carbon to a hydrogen.

To answer your question the carboxyl group from the newly added amino acid would (temporarily) be the c-terminus until a new amino acid is added to extend the chain.

If there are other names (I’m sure there are) they aren’t as commonly used.

Both can help, but one may help you more than the other.

If your magnesium is low, pickle juice/mustard will help more than the quinine in tonic water.

Quinine is what makes tonic water work. Unfortunately some less reputable brands advertise as tonic water but don’t have quinine (idk how tho).

Worse, some are club soda with tons of salt and carbonation. The salt can help but carbonation is typically bad as it can lower your pH. After exercise your body has likely produces lactic acid and the carbonation can make it take longer to clear the acid.

Regular tonic water though will work fine and is relatively safe, and cool under a UV light.

Mustard also works, especially for cramps.

It’s the Magnesium iirc, but it works.

Typically your non-covid viruses. Flu A/B, rhinovirus, adenovirus, parainfluenza, etc.

Covid has been shown to be shed with high variability between individuals and so the best way is a covid PCR test that actually checks for the virus. That said if you no longer have a fever that’s a good indicator that your body has fought off the offending agent (in most cases).

In immune competent individuals this means you have circulating antibodies that should inactivate the virus as it exists the cells and target it for destruction.

Typically if you have a fever you’re considered contagious. Once the fever ends you’re still possibly contagious for up to 72-96 hours, depending on how much virus you’re shedding and how much mucus you’re shedding.

However the best way to be sure to not spread it should you have to go out is a mask. The goal is droplet containment more than anything. Remember say it don’t spray it is truth.

Also the upper half of the face is innervated by both hemispheres. This means that the signal sent my one hemisphere makes it across. This is partly why an upper motor neuron disease (eg. stroke) doesn’t affect the top half of the face (opposite side preserves the top half’s function) whereas a lower motor neuron disorder (bell’s palsy) affects both upper and lower. As the signals have already joined at that point.