Proteins Flashcards
Which of the following AAs does not have aromatic R group? Tyrosine Lysine Tryptophan Phenylalanine
Lysine
Amino acids have chiral center except __
Glycine,arginine,leucine
Glycine
All except one of the proteins below fold into 3D shape to bury hydrophobic amino acid residues. Anong protein yun? Proline Alanine Arginine Methionine
Arginine
The following amino acids have hydrophilic R groups except: Leucine Serine Cysteine Glutamine
Leucine
All have positively charged R groups except Lysine Arginine Glutamine Histidine
Glutamine
All have negatively charged R groups except
Aspartate
Isoleucine
Glutamate
Isoleucine
The ___ structure of protein has alpha helix and beta sheet/conformation
Secondary
The __ structure of protein is described as sequence of amino acid residues in polypeptide chain
Primary
These two amino acids absorb UV light at 280 nm
Tyrosine
Tryptophan
The beta sheet is favored by amino acids with __ side chains (small,large)
Small
The __ structure of protein describes all aspects of the 3D Folding
Tertiary
3 classes of protein structure:
Fibrous proteins
Globular proteins
Membrane proteins
This class of proteins generally forms large insoluble aggregates.. Characterized also by repeating primary structure and one type of secondary structure
Fibrous proteins
Class of proteins with compact shape + hydrophilic residues on the outer surface
Globular proteins
Interact with hydrophobic bilayers of membranes surrounding cells and organelles
Membranous proteins
True or false: the following forces all help in stabilizing protein structure Hydrophobic interaction Electrostatic interaction H-bonds Van der Waals interaction
True
Which protein is mismatched to its location?
Desmosine:elastin
5-hydroxylysine:prothrombin
6-N-methyllysine:myosin
5-hydroxylysine:prothrombin
Dapat collagen :)
Proteins may be selectively precipitated from a mixture by adding any of the ff except: Salts Organic solvents TCA Water
Water
Movement of electrically charged protein molecules at electric field
Electrophoresis
Method that Separates protein mixture based on diff isoelectric points
Isoelectric-focusing electrophoresis
True or false. In gel filtration, proteins are separated based on shape
False. Size ang basis
At physiologic pH, amino acids exist as dipolar ionic species called ___
Zwitterions
