Amino Acids and proteins

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  • 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
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Amino acids are examples of ___ compounds?
Bifunctional - compounds with two functional groups
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Which part of the amino acid acts as the proton donor and which part the proton acceptor?
-COOH = proton donor / -NH2 = proton acceptor
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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.
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Amino acids are very ___ in water because they are effectively ___?
Soluble, ionic
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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.
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Solution that can withstand the addition of small amounts of acid or alkali are called...?
Buffer solutions
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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.
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When two amino acids join in this way, the secondary amide group formed is called a ___ ___?
peptide link
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Proteins are ___ ___ ___ ___ made from ___ ___ ___ joined by ___ ___?
naturally occurring condensation polymers, amino acid monomers, peptide links
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Define primary structure?
The order in which the amino acids are joined to one another.
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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
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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.
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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.
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Define secondary structure?
The folding or twisting of chains in a regular manner to form a helix or sheet.
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Define tertiary structure?
The overall shape of a protein.
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How would you carry out hydrolysis of a peptide or protein?
Heat with moderately concentrated acid or alkali.
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In living organisms the hydrolysis of proteins is catalysed by ___ rather than acid or alkali?
Enzymes
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How would you identify the individual amino acids present in a peptide?
Paper chromatography
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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
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