Question

Q1: Given that pK, = 2.35 and pK2 = 9.69 for alanine. What is its isoelectric point? (10% Points] Q2: Distinguish between peptides and proteins regarding the functions and size in the below table [40% Points) Peptide Polypeptide Size (No. of amino acids) Functions (their roles inside the cells) Main bonds in their molecules Example

Answer 1

polypeptide 0.2. Ansner. peptide sizelpeptide have only while polypeptieel cuerofl'one amino acidº is composed 20-20 amino aud because an anino amino acids till ____lacid is called beptiegl 50 amino acids palypeptide pag is blocks of construction of proteins function peptide, act as structu- Kal component of cell and tissues, hormones Honins, antibiotics anel enzymes. Main bond peptide bond is amide covalent band ca, The while polypeptide here many peptide bonds conth Bands- Insulin Esample t Glucagon. Glutathione

0.3 Answer - _Globular proteins I fibrous proteins Globular protein are these are also spherical, elliptical called sclesoprofeins as oval in shape are fibre like and soluble in structure and Water, and these are water leohal insoluble. Encameples - Example Hair nails, bones. Globulins (cartilage skin. albumins ligaments. Histones provide strength l'anel mechnical prolamines support

Q.U Answered - Level _ Main bonds in each_hevel - tyrosin. to primary structure s-s Bonding Chain of amino Enemple-Insulin auid 2 Secondary structume B-plealed sheet - 'Hyelrogen bond Exemple-Tryptophos. 1a pleated sheet - (C=) and HINH Bonding 3. Testaisy structure - Disulficle. Bonds Ena- Lystekes. - NH3to - Ponic Bond - OH O=C - Mychogenband Ena - Hemoglobin Frydrogen bonding - London forces 4. Quaternary structure:

Q. L Answered - alanin alanin = 2.35 = 9.69 - Pk for Iso electric poin for alanin - fb: pk +PK2 el = 6.02 Ansner 2