Chemical Equilibrium Is Relatively Rare in Living Cells

question 58

Multiple Choice

Chemical equilibrium is relatively rare in living cells.Which of the following could be an example of a reaction at chemical equilibrium in a cell?

• A)a chemical reaction in which the free energy at equilibrium is higher than the free-energy content at any point away from equilibrium
• B)a chemical reaction in which neither the reactants nor the products are being produced or used in any other active metabolic pathway at that time in the cell
• C)an endergonic reaction in an active metabolic pathway in which the energy for that reaction is supplied only by heat from the environment
• D)Chemical equilibrium is not possible under any circumstances in a living cell.

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Definitions:

Net Present Value (NPV)

A valuation method used to assess the profitability of an investment by calculating the present value of expected future cash flows minus the initial investment cost.

Externality

A consequence of an industrial or commercial activity that affects other parties without this being reflected in market prices, often considered as either positive or negative.

Capital Cost Allowance (CCA)

A tax deduction available in Canada for depreciable property that can be used to reduce taxable income.

Straight-line Depreciation

A method of allocating the cost of a tangible asset over its useful life in equal annual amounts.