Which one of the following Metal:Ligand ratios would NOT support reversible binding of the O2 ligand at the active site of a copper-containing dioxygen transport protein? Select one: O 2Cu:O2 O 4Cu:O2 O Cu:O2 O 3Cu:202
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- Which of these compounds will cross the cell membrane without the aid of a membrane transport protein, and why? H3 NH NH 2. By what transport process will the above compound be transported? What are the factors which drive movement across the membrane in this process? Does this process require input of energy?The following molecule is required for the activation of uridylytransferase A. Glycine B. Adenylytransferase C. ATP D. PIIIn the Nernst equation [V = 62 log10 (Co/ Ci)], the term Ci represents: the extracellular concentration of potassium the extracellular concentration of sodium the membrane potential (in millivolts) the intracellular concentration of calcium the intracellular concentration of potassium Which of the following ions must be kept to very low concentrations within the cell cytoplasm in order to allow for enough substrate molecules to synthesize nucleotides and nucleic acids? HCO3- (bicarbonate) Ca2+ (calcium) PO43- (phosphate) Na+ (sodium) K+ (potassium)
- Suppose the major solutes in intact lysosomes are KCl (~0.1 M) and NaCl(~0.03 M). When isolating lysosomes, what concentration of sucrose isrequired in the extracting solution at room temperature (25 °C) to preventswelling and lysis?Why is cytosolic K+ highly concentrated when the extracellular K+ concentration is low even though K+ flow freely through leak channels?Complex III contains which cofactor as a prosthetic group? A. iron-sulfur clusters B. FAD C. FMN D. coenzyme Q E. copper
- Ammonia (NH3) is a weak base that under acidic conditions becomes protonated to the ammonium ion in the following reaction: NH3 + H+ → NH+4 NH3 freely permeates biological membranes, including those of lysosomes. The lysosome is a subcellular organelle with a pH of about 4.5–5.0; the pH of cytoplasm is about 7.0. What is the effect on the pH of the fluid content of lyso- somes when cells are exposed to ammonia? Note: Ammo- nium (NH4+) does not diffuse freely across membranes.. Please describe the transportation of glucose after a meal when glucose is plentifuloutside cells? How is the transport protein that would transport glucose called? Whatwould be the direction of transportation? Would it be active or passive transport? Whatwould be driving force for the glucose transport: chemical gradient or electrochemicalgradient?The cell membranes of mammalian red blood cells are permeableto urea. If red blood cells are dropped into a solution of urea thatis identical in osmotic pressure (isosmotic) to the cytoplasm ofthe cells, although the cells do not swell and burst as quickly aswhen they are dropped simply into pure water, they eventuallyswell and burst. Explain. Also discuss how you would designa solution into which red cells could be placed without everswelling. (Hint: Think about whether urea will stay on theoutside of the cells and the implications for osmotic pressures.)
- Glucose (C6H12O6) exhibits which of the following membrane transport movements? it is able to cross the membrane by facilitated diffusion, because it is small, polar, and organic it is not able to cross the membrane by passive transport, because it is big, polar, and inorganic it is able cross the membrane by simple diffusion, because it is small, nonpolar, and inorganic it is not able to cross the membrane by active transport, because it is big, polar, and inorganic it is able to cross the membrane by active transport, because it is big, nonpolar, and organic 10. A red blood cell that displays a biconcave disc shape must be in which of the following solutions? hypertonic solution distilled water isotonic solution ocean water hypotonic solutionBoth H+ and Ca2+ are ions that move through thecytosol. Why is the movement of H+ ions so much fasterthan that of Ca2+ ions? How do you suppose the speed ofthese two ions would be affected by freezing the solution?Would you expect them to move faster or slower? Explainyour answer.If you start with 100 mM Na+ and 100 mM K+ outside the liposomes, and 100 mM Na+ and 100 mM K+ inside the liposomes like in (A), then you add ATP to the solution outside the liposomes, then how will the Na+ and K+ concentrations change?