Question

When considering free energy change, biochemists usually define a standard state, the biochemical standard state, which is modified from the chemical standard state to fit biochemical applications. Determine which of the phrases describe the biochemical standard state, the chemical standard state, or both. Note that if you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the phrases are sorted incorrectly.

Answer 1

The biochemical standard state and the chemical standard state are used to define the standard state in free energy change calculations. The biochemical standard state is modified to fit biochemistry applications. Standard free energy change in biological systems typically occurs at pH 7.0, 25 degrees Celsius, and 1 atm pressure.

Step-by-step explanation:

The biochemical standard state and the chemical standard state are both used to define the standard state in free energy change calculations, but there are some differences between the two. The biochemical standard state is modified from the chemical standard state to fit biochemical applications. For example, in biochemistry, pH = 7 is commonly employed as the standard pH instead of a pH of zero. The standard free energy change of a chemical reaction is expressed either in kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol) under standard pH, temperature, and pressure conditions. In biological systems, standard conditions are typically pH 7.0, 25 degrees Celsius, and 1 atm pressure.