Give reason: only 20 amino acids are considered as standard
Answers
For many researchers, studying the chemical origins of life is a side project – it’s what they do in between their grant-funded work on the causes and cure of human disease. But understanding evolution at the chemical level is their passion, even when funding is sparse. How chemistry could have brought us to complex life poses many open questions. One fundamental question is why life is based on a set 20 amino acids. Why 20 and not 10 or 30? And why those particular 20? Over the last few decades, the passionate chemists and molecular biologists who can’t leave these questions alone have started piecing together some convincing explanations.
From alanine (A) to tyrosine (Y), 20 ‘proteinogenic’ amino acids, each abbreviated to a different initial, make up the alphabet soup of life. They are the building blocks for proteins, biology’s workhorse macromolecules that provide structure and function in all organisms. But why amino acids? Bernd Moosmann, an expert in redox medicine at the Johannes Gutenberg University of Mainz in Germany suggests the first amino acids were used to anchor membranes to RNA structures: ‘You can see this even in modern life: DNA and RNA in bacteria and mitochondria are always attached from the inside to a membrane.’ Most researcher think this would have been occurring at least 4 billion years ago in an ‘RNA world’, where RNA molecules were the first self-replicators, as well as performing the catalytic role that proteins play today.
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Only 20 amino acids are directly produced in the cells and do not require any external modification.
Explanation:
- Amino acids are made of the polymers of the amino acids that are linked together through the peptide bond.
- These 20 standard amino acids are proteinogenic in nature. These amino acids are the basic building block of all the organisms.
- Other amino acids are formed with the hep of these amino acids and also requires the modification like hydroxylation and phosphorylation.
- These amino acids are conserved in the organisms. The amino acids are further classified into essential and non essential amino acids.
# Learn more with brainly about amino acids:
Definition of amino acids : https://brainly.in/question/10752843.
Examples of amino acids: https://brainly.in/question/3780277.