67. When carbon is a limiting factor, many organisms will skip which steps in th
ID: 88025 • Letter: 6
Question
67. When carbon is a limiting factor, many organisms will skip which steps in the Tricarboxylic Acid Cycle?
A. the steps liberating CO2
B. the hydrolysis steps
C. the formation of GTP
D. the loss of CoA
E. all steps producing NADH
68. What is the pH of 10.0 mL solution of 0.75 M acetate after adding 5.0 mL of 0.10 M HCl (assume a Ka of acetic acid of 1.78x10-5)?
A. 3.60
B. 3.87
C. 5.90
D. 5.62
E. 4.45
69. In signal transduction, how can a single molecular event, or binding of an agonist, result in significant changes to cell metabolism or function?
A. Through activation of enzyme cascades.
B. By promoting rapid changes in ion flux in/out of the cell.
C. By inducing conformational changes that alter cytoskeletal interactions.
D. None of these answers are correct.
E. All of these answers are correct.
Explanation / Answer
1. E all steps producing the NaDH redox potential , because the convertion of isocitrate to oxalsuccinate, and second to alpha keto gluterate and third carbon succinate dehrogenase and malate dehydrogenase the Caron is lost where limiting of carbon source these steps are skipped and reserved as intermediate compounds in TCA cycle.
3) A through the activation of the enzyme cascade proteins ...Example Ras RAF pathway, MAP MEK pathways, G protein couple transduction, protein tyrosine kinase pathways. In these the cell surface proteins acts as receptors when a ligand or hormone binds to the receptors the cascade mode of the activation of proteins enzymes by the phosphorylation reaction so that it directs the nucleus for the expression.
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