L3

Question 1

What is a peptide ?

Answer 1

structures formed due to covenant linkage of 2 or more amino acids by amide (peptide ) bonds between carboxylic group and amino group

Question 2

what are some characteristics of peptide bond ?

Answer 2

trans in nature , rigid and planer , has a partial double bond character

Question 3

list all nomenclatures of peptides.

Answer 3

dipeptide: 2 amino acids linked together

tripeptide : 3 amino acids

oligopeptide : up to 20 AA

Polypeptide: 21-50 AA

proteins : more than 50

although some polypeptides have more than 50 amino acids its best to reserve the term protein to only the final functioning product .

Question 4

proteins can be 1.) monomeric 2.) dimeric 3.)trimeric 4.)tetrameric 5.) oligomeric or 6.)multimeric . explain what these terms mean

Answer 4

monomeric is a protein with only one polypeptide chain

dimeric is one with 2

trimeric is 3 polypeptide chains

tetrameric is 4 polypeptide chains

oligomeric means the protein has up to 10 polypeptide chains

and finally multimeric means it has more than 10 polypeptide chains

Question 5

proteins can be either homodimeric or hetrodimeric . explain these terms .

Answer 5

homodimeric is a protein that has the same polypeptide chain while hetrodimeric has different polypeptide chains

Question 6

what is a simple protein ? and what are some examples of it?

Answer 6

a protein solely made of amino acids ex: globular and fibrous proteins .

Question 7

what are globular proteins ?

Answer 7

circular shaped proteins that are soluble

Question 8

what is a fibrous protein ?

Answer 8

structural protein that is more elongated and insoluble

Question 9

what is a conjugated protein ?

Answer 9

protein that is made of amino acids AND non protein constitutes called prosthetic group

Question 10

note: check table of all protein on LL3 PPT

Answer 10

:D

Question 11

What is a complete protein ?

Answer 11

protein that contains all 10 essential amino acids in required proportion by human body to promote growth .

Question 12

what is a partially complete protein?

Answer 12

protein that is partially lacking in 1 o more essential amino acids and can promote moderate growth

Question 13

what is an incomplete protein?

Answer 13

protein that completely lacks one or more essential amino acids. these proteins do not promote growth