The image below shows ubiquinone. Shaded in yellow is the isoprenoid side chain, which remains unchanged during the electron transport chain. Despite this, what function does it serve? CH3 (CH₂-CH=C-CH₂) 10-H HạCO. H3CO CH3 Select one: a. It is hydrophobic, allowing the molecule to be lipid-soluble so that it can diffuse through the membrane between comple b. It is hydrophilic, allowing the molecule to be water-soluble and diffuse in the intermembrane space between complexes C. It is hydrophobic, allowing successive molecules to cluster together at complex I d. It is hydrophilic, allowing optimal interaction in the matrix with NADH at complex I OOOO Report question issue Notes +

You are studying a biochemical pathway that requires ATP as an energy source. To your dismay, the reactions soon stop, partly because the ATP is rapidly used up and partly because an excess of ADP builds up and inhibits the enzymes involved. You are about to give up when the following table from a biochemistry textbook catches your eye. A. ذن فه B. Substrates C. Creatine + ATP ATP + H₂O Pyrophosphate + H₂O Glucose-6-phosphate + H₂O Enzyme A Enzyme B Enzyme C Enzyme D Products Creatine-phosphate + ADP Which of the following reagents is/are most likely to revitalize your reaction? a vast excess of ATP glucose 6-phosphate and enzyme D creatine phosphate and enzyme A D. pyrophosphate ADP + Phosphate 2 Phosphate Glucose + Phosphate AG (kJ/mol) +3 -7.3 -7.0 -3.3

V-class proton pumps run backward relative to the F-class ATP synthase. Consider the cartoon, which shows the conformations of the beta-subunits and ATPIADP + Pj of the F-class synthase. Which of the following associations between the conformation of the beta subunit and ATP/ADP + P¡ is correct for V- Binding Change Mechanism loose binding ADP+P ATP ATP class pumps? C repeat ADP + P, ADP АТР tight binding АТР +P оpen АТР O The open conformation releases ATP. Hydrolysis of ATP to ADP + P¡ drives the change from tight to loose. O Binding of ADP + P¡ drives change from open to loose. Hydrolysis of ATP to ADP + Pj drives the change from open to loose.

Explain which of the following substances ATP, CoA-SH, FAD and NAD+ have the subunits in their structure? A.Have 2 two ribose subunits.