N-glycosyltransferase attaches which sugar to the base oligosaccharide to synthesize the A antigen? fucose galactose glucose N-acetylglucosamine
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- Question 104 is an irreversible competitive inhibitor of bacterial beta-lactamase. rifampin O trimethoprim clavulanic acid O sulfamethoxazoleQuestion 1 Amyloid Precursor Protein (APP) is actually thought to be a natural neuroprotective agent induced by neuronal stress or injury. O True O False Question 2 Which of the following is not a property of serine protease? A globular protein with high molecular weight ● It is initially synthesized as a zymogen It has uniquely activated tyrosine residue at the active site Cleaves polypeptide at a specific amino acid residue Question 3 RTK is activated by cyclic AMP. O True FalseQuestion 4. Sucrose-6-P Glucose-6-P Cytoplasm Cell wall Cell membrane hasC Glucose-1-PUDP-Glucose hasB HA Fructose-6-P➡ Glucosamine-6-P hasA i. UDP UDP-GICUA UDP-GlcNAc Glucosamine-1-PN-Acetyl Glucosamine-1-P Group A Streptococcus (GAS) is a human-specific bacterial pathogen responsible for serious morbidity and mortality worldwide. The hyaluronic acid (HA) capsule of GAS is a major virulence factor, contributing to bloodstream survival through resistance to neutrophil and antimicrobial peptide killing and to in vivo pathogenicity. Genomic studies of GAS have identified genes for hyaluronate synthase (encoded by basA), a membrane-associated enzyme that forms the linear HA polymer by the alternate addition of N-acetylglucosamine and glucuronic acid residues from their respective UDP-sugar precursors. UDP-glucose 6-dehydrogenase (encoded by hasB) forms UDP-glucuronic acid from UDP-glucose in the presence of NAD, while UDP- glucose pyrophosphorylase (glucose-1-phosphate…
- QUESTION 34 Adenylyl cyclase activity will increase in response to the binding of adenosine triphosphate protein kinase A phosphorylated CAMP activated Gs proteinQuestion 19 tryptophan levels are high O Tryptophan Gene is switched ON O Tryptophan Gene is switched OFF O Does NOT affect the gene expressionQuestion 29 Kappa- and lota- carrageenans contain 3,6-anhydro-a-D-galactopyranosyl residues. True False
- Question 16 is an irreversible competitive inhibitor of bacterial beta-lactamase. O clavulanic acid sulfamethoxazole O trimethoprim O rifampinQuestion 5 (5 points) Match the following tripeptide with its given characteristic: contains sulfur? 1. Tyr-Lys-Met contains the largest number of nonpolar R groups? 2. Gly-Pro-Arg 3. Asp-Trp-Tyr contains two amino acids that contain aromatic ring? 4. Asp-His-Glu is known as glutathione? 5. Leu-Val-Phe is most negatively charged at pH 7? 6. Glu-Cys-Gly IdentificationQUESTION 56 PDGF 100- PI3K PI3K 50 GAPO 771 O GAP protein P-site 3 4 7. PTP O 1009 O PTP PI3K 740, 751 + GAP 771 1021 PTP 1009 PLC PLC PLC-y 1021 When activated by ligand binding, the PDGF (platelet-derived growth factor) receptor becomes phosphorylated on 5 tyrosine residues (left figure). These phosphorylated tyrosines serve as binding sites for proteins that contain SH2 domains (SH2 domains bind phosphorylated Y). These proteins include phospholipase C-gamma (PLC-gamma), a phosphotyrosine phosphatase (PTP), a Ras GTPase-Activating Protein (GAP), and a phosphotidylinositol 3-Kinase (PI3K). PDGF stimulates several changes in the target cell, one of which is DNA synthesis. To determine which effectors of the PDGF receptor is/are responsible for stimulating DNA synthesis, you construct several mutant forms of the receptor that retain individual or combinations of the phosphorylation sites. You express these in cells and monitor DNA synthesis. The results are shown in the right figure.…
- Question 12 Match the tenzyme with the post translational moidification v pyruvate detydrogenase complex a. lipoylysine v aconitase b. phosphotylation an serine v phosphoglycerate mutase c ron-sultur center v phosphoglucomutese d. phosphorylation an histidine A Moving to another question will save this response.Question 2 Pheneticillin (below) is a B-lactamase sensitive penicillin. Draw the structure of the inactive form of the drug after enzymatic hydrolysis. N OHQUESTION 33 Signal transduction amplification is shown on this figure as ADENYLYL CYCLASE SYSTEM -A F E G K- 000 00 000 000 00 000 00 000 00 000 000 00 000 0O 000O 000 00 000 00 000 000 00 000 Label C binding to Label D Label L Label E Label B binding to Label C