The condensation of acetate with oxaloacetate to form citrate has a positive ΔG°′ (+20 to +30 kJ/mol), making it unfavorable under standard conditions. From where is the energy provided to render the overall reaction exergonic?

Which subunit of ATP synthase rotates to transmit energy from proton flow to the catalytic sites?

Magnolia Corp. is a calendar-year S corporation with one shareholder, Cristobal. Magnolia incurred the following items in 2024 and 2025:     On January 1, 2024, Magnolia had AAA and OAA balances of zero and accumulated E&P of $7,000. Also on January 1, 2024, Cristobal had a $15,000 stock basis and a $14,000 basis in debt he loaned to the corporation.   What stock basis and debt basis does Cristobal report at the end of 2024 and 2025?   What are the balances in each corporate account (AAA, accumulated E&P, and OAA) at the end of 2024 and 2025?   What (pass-through) items does Cristobal report in 2024 and 2025?

Which of the following best describes the overall role of the citric acid cycle in metabolism?

What is the primary function of the proton motive force in oxidative phosphorylation?

A researcher proposes a drug that inhibits isocitrate dehydrogenase in cancer cells to slow their growth. Based on your understanding of the citric acid cycle, which of the following is the most reasonable prediction about the metabolic consequences of this inhibition?

Three steps in the citric acid cycle are considered irreversible under cellular conditions. What do these steps have in common?

Josephine was granted 1,000 shares of restricted stock when she started working at Holly Co. At that time, the stock price was $11 per share. The restricted shares vest in two years. Josephine did not make an election under Sec. 83(b) with respect to the restricted stock. On the vesting date, the stock price was $20. Three years after being granted the restricted stock and one year after the shares vested, Josephine sold all her shares for $24 per share. Josephine’s marginal tax rate on ordinary income is 32 percent, and her rate on income taxed at a preferential rate is 15 percent.   How much tax must Josephine pay related to the restricted stock on the following dates?   Grant date – Vest date – Sale date –   What is the amount and date of Holly’s tax deduction with respect to the restricted stock?

The citric acid cycle can be divided into two major phases. Which of the following best describes these phases?

In step 3 of the citric acid cycle, isocitrate is converted to α-ketoglutarate. What is significant about this reaction?