Suppose ribulose-5-phosphate, labeled with 14C in carbon 1, is used as the substrate in dark reactions. In which carbon of 3PG will the label аppear?
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Q: Suppose ribulose-5-phosphate, labeled with 14C in carbon 1, is used as the substrate in carbon…
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Q: Suppose ribulose-5-phosphate, labeled with "C in carbon 1, is used as the substrate in dark…
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- Suppose ribulose-5-phosphate, labeled with "C in carbon 1, is used as the substrate in dark reactions. In which carbon of 3PG will the label appear?Suppose ribulose-5-phosphate, labeled with 14C in carbon 1, is used as the substrate in carbon reactions. In which carbon of 3PG will the label appear?Which of the compounds shown below exhibit a high negative free energy of hydrolysis equal to or larger than the free energy of hydrolysis for the phosphoanhydride of ATP? (Choose all that apply) В Α HPΗ Ho HO HO H2N-CH-C CH2 H2N-CH-C CH2 CH2 H2N-CH-Ö CH2 C CH2 D E O A O B O E O=p-00 O=p-00 O=-00 O=0-00 O=L-00
- To carefully prepared mitochondria were added succinate, oxidizedcytochrome c, ADP, orthophosphate, and sodium cyanide. Referring toFigure 14.16, answer the following.(a) List the sequence of electron carriers in this system.(b) Write a balanced equation for the overall reaction occurring in thissystem, showing oxidation of the initial electron donor, reduction of thefinal acceptor, and synthesis of ATP.(c) Calculate ΔG°' for the overall reaction. ΔG°' for ATP hydrolysis is-32.2 kJ/mol.(d) Why was cyanide added in this experiment?(e) What would the P/O ratio be if the same experiment were run with addition to the mitochondria of 2,4-dinitrophenol?The plant toxin fluoroacetate (F-CH2COO2) is easily converted to fluorocitrate when an animal ingests the plant. The2-fluoro-3-hydroxy citrate molecule is a suicide substrate forthe enzyme aconitase. Consider the overall goal of thisenzyme (to remove the OH group from the tertiary carbonand place another OH group on a secondary carbon) andspeculate as to why the reaction to produce isocitrate does notoccur as planned. (Hint: Fluorine is more electronegativethan oxygen.)(i) During the Pyruvate Decarboxylase (PDC) catalysed reaction, a covalent coenzyme intermediate is formed. On the skeleton of the covalent coenzyme intermediate below draw the appropriate double bonds, charges, and electron pairs to illustrate the two resonance forms of this intermediate. Name each form in the boxes provided. HO S R' N -R HO S R' N -R
- Arrange the following order of chemical events of how ribulose reacts in the light independent reaction of photosynthesis starting from ribulose. Fructose 6-phosphate + PGAL Ribulose 5-phosphate Ribulose 1-5 biphosphate Fructose 6-phosphoglyceraldehyde + PGAL Glyceraldehyde 3-phosphate 1,3-biphosphoglyceric acid 3-phosphoglyceric acid Fructose 1,6-biphosphate + PGAL RibuloseWhy does TPP Thiamine pyrophospate, act as an electron sink? What is it abut its structure that makes it possible?Which of the following statement is CORRECT? O Hydrolysis of starch into glucose in an elimination reaction Group transfer reaction is a nucleophilic substitution reaction Conversion of 3-phosphoglycerate to 2-phosphoglycerate is a group transfer reaction Most biochemical reaction occurs via homolytic cleavage Electrophiles are electron-rich, while nucleophiles are electron-deficient
- Glucose fermentation in yeast produces ethanol as a wasteproduct. In contrast, Clostridium acetobutylicum producesbutanol. Suggest a possible sequence of reactions that wouldproduce butyl alcohols.Pyridoxal phosphate stabilizes carbanionic intermediates by serving as an electron sink. Which other prosthetic group catalyzes reactions in this way?The biosynthesis of vitamin D₂ is a two-step reaction, requiring two types of concerted pericyclic reactions. Draw in the arrows for each step and identify the structure of precalciferol. If an electrocyclic reaction is required, identify if it occurs through a conrotatory or disrotatory reaction. HO H H ergosterol hv precalciferol Cast HO ergocalciferol