If All That Is Required to Drive a Chemical Reaction

question 156

Multiple Choice

If all that is required to drive a chemical reaction is heat, why can't we speed up biological chemical reactions by heating the cell?

• A) High energy costs are prohibitive for the whole cell.
• B) Excess heat would indiscriminately speed up all chemical reactions, including desirable and undesirable reactions, as well as denature the biological catalysts (enzymes) involved.
• C) Organisms that have self-regulated body temperature, such as mammals, already heat their chemical reactions and do not need external heat sources.
• D) Excess heat would slow down the rate of product formation for many chemical reactions.
• E) Evenly heating the entire cell is technically difficult, mainly because of high concentrations of hydrophobic molecules in the phospholipid bilayer.

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