Which of the following is not true about enzymes: a. They increase ΔG of reactions. b. They are

step 1 So this question is asking us to determine which of the following statements is false about enzy

Which of the following is not true about enzymes: a. They...

Which of the following is not true about enzymes:
a. They increase $\Delta G$ of reactions.
b. They are usually made of amino acids.
c. They lower the activation energy of chemical reactions.
d. Each one is specific to the particular substrate(s) to which it binds.

Key Concepts

Substrate Specificity

Enzymes exhibit substrate specificity, which means each enzyme typically interacts with a specific substrate or group of substrates. This specificity arises from the precise interaction between the enzyme's active site and the substrate, ensuring that biological reactions occur efficiently and accurately.

Enzyme Catalysis

Enzymes are biological catalysts that accelerate chemical reactions without being consumed. They do so by providing an alternative reaction pathway with a lower activation energy, thereby enabling reactions to occur more rapidly under physiological conditions.

Activation Energy

Activation energy is the minimum energy required for a chemical reaction to occur. Enzymes reduce this energy barrier, facilitating the effective transformation of substrates into products, which is fundamental for life processes.

Gibbs Free Energy

Gibbs free energy (?G) is a measure of the spontaneity of a reaction. Enzymes do not alter the overall ?G of a reaction; they only affect the reaction rate by lowering the activation energy, meaning they do not change the reaction’s thermodynamic favorability.

Amino Acid Composition

Most enzymes are proteins, composed of amino acids. The sequence and three-dimensional structure of these amino acids determine the enzyme's function, stability, and activity, making them essential to the enzyme’s catalytic properties.

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