Amino acids Flashcards Preview

Organic chemistry and synthesis A2 > Amino acids > Flashcards

Flashcards in Amino acids Deck (18):
1

What functional groups does an amino acid contain?

Amino group and carboxylic acid group

2

Amino acids can combine in what type of reaction?

A condensationreaction

3

If 2 amino acids combine what is produced?

A dipeptide

4

If 2 different types of amino acids combine what will be produced?

2 different types of dipeptide

5

What is produced when more than 2 amino acids combine?

A polypeptide which leads to protein formation

6

What does R represent in...
Glycine (2-aminoethanoicacid)
Alanine (2-aminopropanoicacid)
Serine (2-amino-3-hydroxypropanoicacid)

Glycine- H
Alanine- CH3
Serine- CH2OH

7

What is a primary protein structure?

The precise sequence of amino acids in the protein chain - many sequences with different amino acids

8

What is. Secondary protein structure

How parts of the protein fold up to form an alpha helix (held in shape by hydrogen bonds involving peptide link) or a beta pleated sheet (paper shape stabilised by hydrogen bonds between amino acids in different polypeptide chains)

Results in hydrogen bonding
Occurs between N-H and C=O groups of polypeptide chains

9

What is a tertiary protein structure

Proteins as a whole and the way in which alpha helices and beta pleated sheets of protein fold with respect to eachother

This structure is held together by interactions eg
Intramolecular- covalent and ionic bonds
Intermolecular - VDW and H bonds

10

Draw acids hydrolysis of peptide/amide link

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11

Draw alkaline hydrolysis of peptide/amide link

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12

What do amino acids predominantly exist as and what are these?

Zwitterions: these are internal sales and neutral molecules

13

Draw a zwitterion

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14

Draw the zwitterionic nature of amino acids in acidic conditions

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15

Draw the zwitterionic nature of amino acids in alkaline conditions

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16

What are the properties of amino acids?

High melting points- have strong ionic bonding (IMF) lots of energy to overcome bonding and melt

Soluble in water due to ionic properties

17

In acid hydrolysis of the amide peptide link what do u add

H3O+

H2 to N
OH to c

18

Alkaline hydrolysis of amide peptide link what is added

NaOH

H to N
Na+O- to C