Which of the following polypeptides CANNOT be phosphorylated? O a. -LIYLIA- O b. O C. O d. O e. -ASILD- -ILTALD- -DLTYLA- -NDLALP-
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- cyanogen bromide for c trypsin will cleave b what thing will be cleave site a and d?Complex III contains which cofactor as a prosthetic group? A. iron-sulfur clusters B. FAD C. FMN D. coenzyme Q E. copperWhat type of linkage is catalyzed by peptidyl transferase activity? a. anhydride b. mixed anhydride c. amide d. ester
- What type of reaction does Ribulose-5-phosphate isomerase catalyze? A) isomerization B) not enough information to tell C) cleavage of ribulose-5-phosphate D) ribulose-5-phosphateWhich of the following 1-C unit:carrier pairing is/are correct? a.biotin:C02 b.THF:-CH2- c.THF:CHO d.S-adenosylmethionine:-CH3In the deoxy state of HB, which of the following does not occur? a) An inter-chain salt bridge between Histidine 146 and Lys 40 b) An intra-chain salt bridge between Val 98 and Tyr 145. c) An intra-chain salt bridge between Histidine 146 and Aspartate 94 side chains d) A peptide bond between Tyr 145 and His 146.
- Organisms (like mice) that contain essential selenoproteins_____ Select one: a. posses tRNAs that bind to the amino acid selenocysteine b. posses scaffold proteins that bind to the cofactor selenocysteine c. acquire selenium from the atmosphere d. posses selenium fixation enzymes e. posses unique ribosomes that only make selenoproteins from selenocysteineA methyltransferase enzyme capable of methylating ribosomes and changing their structure might protect against (choose all that apply) A. chloramphenicol B. penicillin C. polymyxin B D. bacitracin E. tetracyclineBeta-lactam antibiotics work by? O A. cleaving peptide side chains O B. preventing cross-linking of the peptide side chains by transpeptidase O C. cleaving the 1,4 beta-glycosidic bond between the NAM and NAG © D. inhibiting the action of bactoprenol O E. preventing peptidoglycan from being flipped to the external side of the plasma membrane
- Each of the following statements concerning penicillin is correct EXCEPT: a. Penicillin is a bacteriostatic drug because autolytic enzymes are not activated. b. Penicillin inhibits transpeptidases, which are required for cross-linking peptidoglycan. C. The structure of penicillin resembles that of a dipeptide of alanine, which is a component of peptidoglycan. D. An intact β-lactam ring of penicillin is required for its activity.Imidazole is used to elute His6-tagged proteins from Ni-NTA resins because imidazole is: a. More acidic b. Structurally similar to histidine c. More basic d. A compound that can change the pH in the bufferIndicate whether the following sentences is either True or False and CORRECT if False : Monomeric α-catenin binds strongly to E-cadherin-β-catenin; and the dimer binds to intergrins.