proteins are polypeptides i.e.They are linear chains of amino acids linked by peptide
bonds .
Each protein is a polymer of amino acids.
As 20 different types of amino acids ( like alanine , cysteine, proline , tryptophan,
lysine , tyrosine, phenylalanine, Valine etc ) , protein is a heteropolymer.
Essential &non essential amino acids
Certain amino acids which are essential for our health and they have to be supplied
through diet = essential aa.
Those amino acids which our body can make = non essential amino acids.
SOME PROTEINS AND THEIR FUNCTIONS
Some important points
1. Collagen is the most important protein in animal world.
2. Rubisco ( ribulose bisphosphate carboxylase - oxygenase ) is the most abundant
protein in the whole of the biosphere.
2 iologist describes the protein structure at four levels .
1. Primary structure - it tells us about the sequence of amino acids i.e. the positional
information in a protein - which is first amino acids which is second and so on.
A protein is imagined as a line , the left end represents the first amino acid and
the right end represents the last amino acids.
3 The first amino acid= N terminal amino acid.
The last amino acid= C terminal amino acid.
2. Secondary structure of protein - The protein thread are arranged in the form of a
helix . Alpha helix ( only right handed helices are observed. Or in form of beta
plated sheet . 3. Tertiary structure of protein - 3-D view of a protein. The long protein chain is
folded upon itself like a hollow woolen ball .
Tertiary structure is absolutely necessary for the many biological activity of
proteins.
5 Quaternary structure of protein - when more than one polypeptides or subunits
assembled in form of Alpha helix , cube or plate etc . Example: Haemoglobin .it
consists of 4 subunits. 2 alpha type and 2 beta type.
Thank you all ❤️.
#class11 #biomoleculesclass11 #biology#photosynthesisinhigherplantsclass11 #pw #pw_motivation #pwians #protein #structureofprotein#neet2025 #neetmotivation #lastminutetips
https://youtu.be/35US4b7jnBE?feature=shared