Which of these statements about hemoglobin is NOT true? A) it is a tetrameric globular protein   b)  it has a prosthetic group called heme   c) it’s dominant motif is beta barrel   d)  its dominant motif is helix-turn-helix The reagent used to break disulfide bonds is: a)  urea   b)  beta-mercaptoethanol   c)   guanidine hydrochloride   d) phosphorus pentachloride

The cofactor shown below: is an oxidizing agent is a reducing agent is a carrier of acyl groups is flavin mononucleotide The cofactor shown below: CH2 HC OH HC OH HC OH CH2 H₂C NH H H H OH OH NH₂ 1) is an oxidizing agent 2) is a reducing agent 3) is a carrier of acyl groups 4) is flavin mononucleotide

WHICH OF THE FOLLOWING ENZYME CAUSES TRIAD OF MENTAL CONFUSION , OPHTHALMOPLEGIA AND ΑΤΑΧΙΑ? А) VIT B1 в) VIT B2 с) VIT B6 D) VIT B12 E) VIT C

SDS coats proteins with a: A) Positive Charge B) Negative Charge

The isoelectric point of an amino acid is the point where; O a) the amino acid carries no net electrical charge b) the a-carboxylic acid is protonated and the a-amino group is unprotonated c) ) the pKa of the a-carboxylic acid is the same as the pK, of the a-amino group a d) the solubility of the amino acid is maximized e) the a-carboxylic acid and the a-amino group are both half protonated MacBo 80 000 esc F1 F2 F3 F4

Give the IUPAC names of the following. Answer A, B, C and D. Thank you!

Which of the following components of the ubiqutin-proteasome pathway are ATPases?  (i.e., which consume ATP in order to function?) (Select all that apply) a)E3 ubiquitin-protein ligase b)19S proteasome c)20S proteasome d)E2 ubiquitin-conjugating enzyme e)E1 ubiquitin-activating enzyme f)Ubiquitin

A mutation of Lysine 82 (in the DPG-binding pocket) to Arginine in beta sub-unit will most likely result in  a) Not enough information b) Normal binding to oxygen c) Higher than normal binding affinity to oxygen d) Lower than normal binding affinity to oxygen

Which of the following link together amino acid units?A) Glycosidic bondsB) Disulfide bondsC) Peptide bondsD) Hydrogen bondsE) Ester linkages

What reagent present in the protein sample buffer is important for breaking disulfide bonds? a) 2-mercaptoethanol O b) chloride ions O c) glycine O d) SDS