Amino Acids Flashcards by Pablo Rodriguez

Q

Tryptophan

A

AROMATIC SIDE CHAIN

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Q

Methionine

A

Non-polar

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Q

Aspartic Acid

A

Derived from Asparagine

Negatively charged (acidic) side chains at 7.4 pH

Aspartate is the deprotonated form (minus the H in OH) = O-

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Q

Threonine

A

has OH group can participate in HB

Polar

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Q

Tyrosine

A

Aromatic

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Q

Glycine

A

* Only AA that is Achiral

Non-polar

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Q

Isoleucine

A

Non-polar

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Q

Lysine

A

Positively charged

has a terminal primary amino group

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Q

Proline

A

Non-polar

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Q

Asparagine

A

Polar

Amid Side chain

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Q

Phenylalanine

A

Aromatic

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Q

Glutamine

A

Polar

Amid Side chain

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Q

A

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Q

How much does an AA weight

A

110 Da

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Q

Cysteine

A

Only AA with (R) configuration

Has a thiol (-SH)

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Q

Histidine

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A

Positively charged

Q

Valine

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A

Non-polar

Q

Amphoteric Species

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A

they can either accept or donate a proton

AA can donate from the carboxylic group or receive in the amino group

Q

Glutamic Acid

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A

Derived from Glutamine

Negatively charged (acidic) side chains at 7.4 pH

Glutamate is the deprotonated form (minus the H in OH) = O-

Q

Leucine

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A

Non-polar

Q

Serine

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A

has OH group can participate in HB

Polar

Q

Alanine

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A

Non-polar

Q

Arginine

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A

Positively charged (basic)

Q

How many pKa’s in amino acids

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A

AA with ionizable side chains have 3

K, Y, R, C, H, E, D

Lysine, Tyrosine, Argenine, Cystine, Histine, Glutamic Acid, Aspartate

Are Peptide Bonds thermodynamically and kinetically stable or unstable?

thermodynamically: Stable kinetically: unstable

What does the pKa mean? if pH is lower than pKa what does that indicate?

the pKa of a group is when half of its molecules are half deprotonated if pH lower than pKa, means that majority are protonated