Banana's do not have proteins. Generally speaking proteins can be found in meat. Banana has 0% cholesterol and big quantities of Potassium and Magnesium which help considerably with muscles (e.g. heart). That's their main benefit nutrition-wise.
Avogado, spinach and sweet potato (boiled/natural) has bigger amounts of Potassium.
A banana has ~1g - 1.5g of protein. By dried weight, it's a lower % of protein than a lot of other fruits. I admit it isn't much (it's about as much protein as 1 teaspoon of peanut butter).
Almost _everything_ has protein in it. You get your recommended daily intake of protein at around 9 large baked potatoes.
Anyway, you're right proteins can be found virtually everywhere.
That isn't true at all.
And it only brings up the question: Where does the meat get the protein?
Animals can not make protein (or more accurately amino acids), only plants can. (Maybe some microorganisms too? Not sure.) Animals can only rearrange existing amino acids into other amino acids or into proteins.
All plants have protein, some more than others. Grains and legumes have the most of the plants.
But basically animals can only rearrange other amino acids, they can not be make them from basic elements.
Only 9 of the 22 "standard" amino acids can't be synthesized de novo by the human body.
How exactly would you make an amino acid from glucose or a fatty acid? There is no nitrogen in either of those.
All those amino acids are made from OTHER amino acids.
The Critic acid cycle is awesome, but it can not perform nuclear synthesis. It has no way to making nitrogen.
As I've said 3 times already, it makes amino acids from other amino acids.
One of the ingredients is NAD, which is made from tryptophan or aspartic acid, both of which are amino acids.
You are simply wrong, and you need to update your information.
Animals can only make amino acids from other amino acids.
Or niacin: http://en.wikipedia.org/wiki/Niacin
NAD is made of nicotinamide AND Adenine. Adenine is in turn made from the amino acids glycine, glutamine, and aspartic acid.
Are you going to acknowledge you were wrong, and actually learn something? Or will you keep arguing?
Us animals are capable of amino acid synthesis for some amino acids.
> Us animals are capable of amino acid synthesis for some amino acids.
Really? You can make an amino acid from ammonia?
No, you can not. You can only make amino acids from other amino acids.
Here, I'll even link if for you: https://en.wikipedia.org/wiki/Amino_acid_synthesis#From_inte...
Follow each of the pathways there, and you will see. Each non-essential amino acid is made from another amino aid.
Where will you move the post after you find out about niacin?
Nothing has changed in what I said since then.
> Where will you move the post after you find out about niacin?
As I replied elsewhere niacin alone is not enough.