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Proteins, also known as polypeptides, are amino acid sequences. All proteins are made of amino acids.
Proteins exhibit variance. This is due to the fact that there can be a myriad of possible combinations: there are only 20 amino acids, but most polypeptides are composed of thousands and thousands of amino acids!
Polypeptides are formed on ribosomes (which are respectively made of (A) ribosomal RNA and (B) protein, for structural support).
Amino acids are linked via peptide bonds. A peptide bond occurs between the carboxyl group of an amino acid (-COOH) and the amino group of another (-NH3). It is a condensation reaction, and thus yields water.
When broken down (e.g. by protease enzymes), a reverse reaction occurs: hydrolysis. The peptide bond is broken, and water is taken up to restore the normal structure of an amino acid (regenerating the -COOH and the -NH3 ends).see more
Existentialism is a philosophical school of thought that was born around the 1950s.
Existentialists stress the importance of choices. Contrary to moral supernaturalism and nihilism, existentialism puts forward the idea that only we can decide what our life purpose is. In other words, no other being or force can decide for us: it is completely up to us.
"We are left alone, with no excuse." (Jean-Paul Sartre)
One of the most important concepts in existentialism is authenticity. To be authentic, or to lead an authentic life, is to make choices on our own and not to follow other people's believes or lifestyles. An authentic life is one that is chosen purely by the individual himself or herself, and not by an outside force.see more