13.9 Amino Acids A quick recall test on amino acids 3.5 / 5 based on 2 ratings ? ChemistryAcids, bases and saltsAmines and azo dyesA2/A-levelOCR Created by: HannahCreated on: 04-11-12 15:00 What functional groups make up an amino acid? COOH, NH2, R group, H 1 of 16 What are amino acids examples of? Bifunctional compounds 2 of 16 What is a zwitterion? a particle that contains both negativly and positivly charged groups 3 of 16 Which part of an amino acid donates protons and which part accepts them? COOH = donates , NH2 = accepts 4 of 16 How to amino acids behave in water and why? amino acids are soluble in water because they are effectivly ionic 5 of 16 What is a buffer solution? a solution which can withstand a small addition of acid or alkali 6 of 16 Why are amino acids buffer solutions? the zwitterions neutralise the effects of additions 7 of 16 What is a peptide link? when the NH2 group reacts with the COOH group in a condensation reaction forming COHN 8 of 16 What are two amino acids called when they are joined?` Dipeptide 9 of 16 What does Primary structure mean? the order in which the amino acids are joined to one another 10 of 16 What is secondary structure? either a helix or a sheet. 11 of 16 Describe helix structure where the C=O group of one peptide link forms a hydrogen bond to an N-H group FOUR peptide links along the chain 12 of 16 Describe sheet structure stretched out regions of extended chain, which lie alongside each other and hydrogen bond 13 of 16 How would you hydrolyse a peptide? heating with a moderatly concentrated acid or alkali 14 of 16 How is the breakdown of protiens done in a lab? boiling with moderatly concentrated HCL to hydrolyse the C-N bonds 15 of 16 How are individual amino acids indentified in a peptide~? Paper chromotography: hydrolysed under reflux and the product is compared to known samples 16 of 16
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