Amino Acids Flashcards

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1
Q

Glycine

A

Nonpolar, hydrophobic

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2
Q

Serine

A

Polar, neutral

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3
Q

Aspartic acid

A

Polar, acidic

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4
Q

Histidine

A

Polar, basic, can donate or accept a proton at physiological pH

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5
Q

Alanine

A

Nonpolar, hydrophobic

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6
Q

Threonine

A

Polar, neutral, essential

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7
Q

Glutamic acid

A

Polar, acidic

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8
Q

Arginine

A

Polar, basic

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9
Q

Valine

A

Nonpolar, hydrophobic, essential

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10
Q

Aspargine

A

Polar, neutral

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11
Q

Aspartate

A

Aspartic acid without the H+

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12
Q

Lysine

A

Polar, basic, essential

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13
Q

Which polar, basic amino acid is essential?

A

Lysine

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14
Q

Methionine

A

Nonpolar, hydrophobic, essential, thioether

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15
Q

Glutamine

A

Polar, neutral

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16
Q

Glutamate

A

Glutamic acid without the H+

17
Q

Which amino acid can donate/accept a proton at physiological pH?

A

Histidine

18
Q

Leucine

A

Nonpolar, hydrophobic, essential

19
Q

Cysteine

A

Polar, neutral, thiol/sulfhydryl

20
Q

Which amino acid is a thioether?

A

Methionine

21
Q

Isoleucine

A

Nonpolar, hydrophobic, essential

22
Q

Tyrosine

A

Polar, neutral

23
Q

Which amino acid is a thiol/sulfhydryl?

A

Cysteine

24
Q

Proline

A

Nonpolar, hydrophobic

25
Q

Phenylalanine

A

Nonpolar, hydrophobic

26
Q

Tryptophan

A

Nonpolar, hydrophobic, essential

27
Q

Which two amino acids have sulfur?

A

Methionine & Cysteine

28
Q

Name the 8 essential amino acids.

A
  1. Valine
  2. Methionine
  3. Leucine
  4. Isoleucine
  5. Phenylalanine
  6. Tryptophan
  7. Threonine
  8. Lysine
29
Q

Which amino acid (residue) never appears within an alpha-helix?

A

Proline