Amino Acids and proteins

?
  • Created by: J.E.C.
  • Created on: 13-04-14 13:08
Amino acids contain two groups, these are?
At least one amino group and one carboxylic acid group
1 of 19
Amino acids are examples of ___ compounds?
Bifunctional - compounds with two functional groups
2 of 19
Which part of the amino acid acts as the proton donor and which part the proton acceptor?
-COOH = proton donor / -NH2 = proton acceptor
3 of 19
When the COOH and NH2 parts react with one another, a zwitterion can form, what is this?
Particles containing both negatively charged and positively charged groups.
4 of 19
Amino acids are very ___ in water because they are effectively ___?
Soluble, ionic
5 of 19
What is the effect on the pH of aa amino acid solution if you add a small quantity of acid or alkali?
Little change to the pH because the zwitterions neutralise the effect of the addition.
6 of 19
Solution that can withstand the addition of small amounts of acid or alkali are called...?
Buffer solutions
7 of 19
When an NH2 group reacts with a COOH group a __ __ __ is formed? This process eliminates a molecule of ___ so is a ___ reaction?
Secondary Amide group. Water, condensation.
8 of 19
When two amino acids join in this way, the secondary amide group formed is called a ___ ___?
peptide link
9 of 19
Proteins are ___ ___ ___ ___ made from ___ ___ ___ joined by ___ ___?
naturally occurring condensation polymers, amino acid monomers, peptide links
10 of 19
Define primary structure?
The order in which the amino acids are joined to one another.
11 of 19
What are the four types of interaction that are important when it comes to the folding together of the chains?
1. Id-id bonds between non-polar side chains 2. H bonds between polar side chains 3.Ionic bonds between ionisable side chains 4. Covalent bonding
12 of 19
Describe the helix shape of a protein?
Tightly coiled where the C=O group of one peptide link forms a H bond to the N-H group four peptide links along the chain.
13 of 19
Describe the sheeted shape of a protein?
Stretched out into regions of extended chain, which lie alongside one another and H bond to form a sheet.
14 of 19
Define secondary structure?
The folding or twisting of chains in a regular manner to form a helix or sheet.
15 of 19
Define tertiary structure?
The overall shape of a protein.
16 of 19
How would you carry out hydrolysis of a peptide or protein?
Heat with moderately concentrated acid or alkali.
17 of 19
In living organisms the hydrolysis of proteins is catalysed by ___ rather than acid or alkali?
Enzymes
18 of 19
How would you identify the individual amino acids present in a peptide?
Paper chromatography
19 of 19

Other cards in this set

Card 2

Front

Amino acids are examples of ___ compounds?

Back

Bifunctional - compounds with two functional groups

Card 3

Front

Which part of the amino acid acts as the proton donor and which part the proton acceptor?

Back

Preview of the front of card 3

Card 4

Front

When the COOH and NH2 parts react with one another, a zwitterion can form, what is this?

Back

Preview of the front of card 4

Card 5

Front

Amino acids are very ___ in water because they are effectively ___?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Thread of Life resources »