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PH 161 > Proteins > Flashcards

Proteins Flashcards

0
Q 
Which of the following AAs does not have aromatic R group?
Tyrosine
Lysine
Tryptophan
Phenylalanine
A

Lysine

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1
Q

Amino acids have chiral center except __

Glycine,arginine,leucine

A

Glycine

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2
Q 
All except one of the proteins below fold into 3D shape to bury hydrophobic amino acid residues. Anong protein yun?
Proline
Alanine
Arginine
Methionine
A

Arginine

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3
Q 
The following amino acids have hydrophilic R groups except:
Leucine
Serine
Cysteine
Glutamine
A

Leucine

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4
Q 
All have positively charged R groups except
Lysine
Arginine
Glutamine
Histidine
A

Glutamine

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5
Q

All have negatively charged R groups except
Aspartate
Isoleucine
Glutamate

A

Isoleucine

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6
Q

The ___ structure of protein has alpha helix and beta sheet/conformation

A

Secondary

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7
Q

The __ structure of protein is described as sequence of amino acid residues in polypeptide chain

A

Primary

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8
Q

These two amino acids absorb UV light at 280 nm

A

Tyrosine

Tryptophan

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9
Q

The beta sheet is favored by amino acids with __ side chains (small,large)

A

Small

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10
Q

The __ structure of protein describes all aspects of the 3D Folding

A

Tertiary

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11
Q

3 classes of protein structure:

A

Fibrous proteins
Globular proteins
Membrane proteins

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12
Q

This class of proteins generally forms large insoluble aggregates.. Characterized also by repeating primary structure and one type of secondary structure

A

Fibrous proteins

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13
Q

Class of proteins with compact shape + hydrophilic residues on the outer surface

A

Globular proteins

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14
Q

Interact with hydrophobic bilayers of membranes surrounding cells and organelles

A

Membranous proteins

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15
Q 
True or false: the following forces all help in stabilizing protein structure
Hydrophobic interaction
Electrostatic interaction
H-bonds
Van der Waals interaction
A

True

16
Q

Which protein is mismatched to its location?
Desmosine:elastin
5-hydroxylysine:prothrombin
6-N-methyllysine:myosin

A

5-hydroxylysine:prothrombin

Dapat collagen :)

17
Q 
Proteins may be selectively precipitated from a mixture by adding any of the ff except:
Salts
Organic solvents
TCA
Water
A

Water

18
Q

Movement of electrically charged protein molecules at electric field

A

Electrophoresis

19
Q

Method that Separates protein mixture based on diff isoelectric points

A

Isoelectric-focusing electrophoresis

20
Q

True or false. In gel filtration, proteins are separated based on shape

A

False. Size ang basis

21
Q

At physiologic pH, amino acids exist as dipolar ionic species called ___

A

Zwitterions

PH 161 (12 decks)

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