Unit 4.7 Amino Acids
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Define amphoteric
Can react both as base and acid
Define zwitterion (3 things)
• Dipolar ion • Both positive & negative charge • Resulting in neutral molecule
How can u tell it’s an α-amino acid? (3 things)
• H2N on the left • COOH on the right • Quite obscure…
What classifies an α-amino acid? (2-way)
• It’s on the α-carbon • to the carboxylic acid
What is the general formula for an α-amino acid?
CHR(NH2)COOH
Draw displayed formula of general formula for an α-amino acid (Whiteboard)
Lol
What is the simplest amino acid? (2-tings)
• Glycine • R group is just H
Draw structural formula of glycine “3D” (Whiteboard
Stage is urs per se?
How does the presence of an amine group allow amino acids to also act as a base? (2-way)
• Lone pair on nitrogen can act as a base • Accepting a proton/donating an electron pair
What allows the amino acid to be amphoteric?
• Base (Nitrogen lone pair) • Acid (Carboxylic acid prob)
Show with a diagram, the amphoteric behaviour glycine State what the result is?
Alas, the zwitterion
Draw the zwitterion version of alanine (R=CH3) (Whiteboard) (Just use that as foundation incase of other “zwitterions”)
The stage is always urs
Explain whether m.p of amino acid is high or low? (3 things)
• Much higher up • Can form ionic bonds with neighboring ions • Due to charge
How are amino acids also soluble in water? (3 things)
• Can do hydrogen bonds • They’re polar molecules • Dissolves within water
How can different amino acids have different solubility? (1 thing, 1 imp)
• Based on chain length • Length ∝ 1/solubility
Define isoelectric points (2-way)
• The pH value at which • the molecule carries no electric charge
The biggest regret, not listening
I’ll somehow draw this BUT, hopefully that next specific lesson comes in clutch man
What is a zwitterion?
Idk the full real answer… BUT: - seems to be the “isoelectric point”??? - In the amino acids, the ones with an electron negative O- (Dipole type shi) - Involves with the different pH (acidic and alkaline type shi)
How to draw the zwitterion versions of an amino acid? (2-way)
• Turn their OH • … an O- • More H into the N (+NH3)
What may happen to a zwitterion of an amino acid if turned more acidic? (2 things)
• O- to OH • NH2 to N+H3
What may happen to a zwitterion of an amino acid if turned more alkaline? (2 things)
• O- stays the same • N+3 to NH2
Show me the amide group?
-NH-C(=O)-
What’s the amide group called in the “biology section”?
Dipeptides