3.6 Flashcards

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1
Q

Monomer of protein?

A

Amino acid

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2
Q

Elements proteins contain?

A

C H O N

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3
Q

How many in total and essential and non essential amino acids?

A

Total - 20
Essential- 9
Non essential - 5

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4
Q

What do proteins consist of?

A

One or more polypeptides (which are made of amino acids)

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5
Q

Synthesis of peptides?

A

Amino acids join when the amine and carboxylic groups react. Hydroxyl in carboxyluc group and hydrogen in amine group. Forms a peptide bond. Water is produced - condensation reaction

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6
Q

How can the synthesis of peptides be catalysed?

A

Peptidyl transferase present in ribosomes

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7
Q

Levels of protein structure?

A

Primary
Secondary
Tertiary
Quaternary

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8
Q

Explain primary structure

A

Sequence which the amino acids are joined, directed by info in DNA. This will influence the final shape and function. Only bonds involved are peptide bonds

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9
Q

Explain secondary structure

A

Oxygen hydrogen and nitrogen atoms of amino acids interact.

Alpha helix- hydrogen bonds (coil shape)
Beta pleated sheet- hydrogen bonds (pleated shape)

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10
Q

Explain tertiary structure

A

Folding of protein into final shape. R groups interact.
Interactions that occur between r groups:
Hydrogen bonds
Ionic bonds
Hydroph and hydrophil interactions
Disulphides bonds

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11
Q

Explain quaternary structure

A

Two or more protein subunits combine. Interactions the same as in tertiary structure but between diff proteins rather than within one molecule.

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12
Q

Test to identify proteins?

A

Biuret test
Sample mixed w biuret sol
Left to stand for 5 mins
(Blue to purple)

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