Proteins and their Building Blocks Flashcards

1
Q

Protein structure is categorised into 4 levels…

A

Primary
Secondary
Tertiary
Quaternary

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2
Q

The linear sequence of amino acids determines the…

A

Properties of proteins

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3
Q

A molecule with charges, but no net charge is known as a…

A

Zwitterion

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4
Q

Peptide bonds join the terminal carbon of one amino acid to the…

A

N terminus (nitrogen) of another

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5
Q

Most amino acids are stereoisomeric, coming in a L or D forms. Proteins only contain the ? form

A

L for “living”

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6
Q

Peptide bonds are rigid due to a the formation of a… 🔒

A

Partial double bond

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7
Q

The CORN law states the order of the functional groups in L-form amino acids, assuming the hydrogen is…

A

Facing towards us

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8
Q

Chloramphenicol is an antibiotic, which works by mimicking the shape of a ? This enables it to bind to and thus inhibit the bacterial ribosome.

A

Peptide bond

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9
Q

Optical isomerism is important in the context of drug discovery and production because…

A

Different isomers can have very different effects

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10
Q

The ‘small’ amino acids are (5):

A
  • Glycine
  • Alanine
  • Serine
  • Threonine
  • Cysteine
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11
Q

The charged/polar amino acids are (7):

A
Negatively charged:
➖ Aspartate
➖ Glutamate
Polar:
• Asparagine
• Glutamine

Positively charged:
➕ Lysine
➕ Arginine
➕ Histidine

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12
Q

The hydrophobic amino acids are (4): 💧🙅‍♂️

A
  • Valine
  • Leucine / Isoleucine
  • Methionine
  • Proline
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13
Q

The aromatic amino acids are (3):

A
  • Phenylalanine
  • Tyrosine
  • Tryptophan
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14
Q

The aromatic amino acids are also…

A

Hydrophobic

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15
Q

The largest amino acids are the…

A

Aromatic amino acids

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16
Q

Proline is notable because it…

A

Does not form a peptide bond

17
Q

Glycine is notable for its…

A

Lack of optical isomerism

there are 2 hydrogens, thus the central carbon is not chiral

18
Q

Phenylketoneuria is a disorder in which the body is unable to breakdown excess…

A

Phenylalanine

19
Q

Disulphide bonds can form either between amino acid side groups or between side group and…

A

Metals

20
Q

Disulphide bonds are only found between the thiol side groups (S/H) of which amino acids?

A

Cystines

21
Q

Disulphide bonds increase the stability of proteins. This is particularly important for…

A

Extra-cellular proteins, such as pepsin, insulin or bee venom

22
Q

Disulphide bonds are present in ( all / the majority / a few / no ) proteins…

A

A few

23
Q

Each amino acid in a peptide is known as a…

A

Residue

24
Q

Secondary structure is determined by…

A

Hydrogen bonds

25
Q

In the alpha helix, hydrogen bonds form between peptide bonds further down the chain. The resulting helix structure has ? residues per turn

A

3.6

26
Q

The beta sheet has two forms, X and Y. Y is less stable…

A

X: Antiparallel
Y: Parallel (less stable)

27
Q

In the beta sheet, bonds form…

A

Between strands

28
Q

In the beta sheet, side chains alternate…

A

Between up and down positions