A protein that accelerates the speed of a chemical reaction without itself being changed by the reaction is :

Question

Accepted Answer

Option 3, "Enzyme," is the correct answer because enzymes are biological catalysts that accelerate the speed of chemical reactions without being consumed or permanently altered by the reaction. Enzymes are proteins that lower the activation energy required for a reaction to proceed, thereby increasing the reaction rate. They are highly specific to their substrates and can be reused multiple times, making them efficient catalysts in biological systems.

Now, let's explain why the other options are incorrect:

1. **Glucose**: Glucose is a simple sugar and a primary source of energy for cells. It is not a catalyst and does not facilitate chemical reactions without being consumed. Instead, glucose is often a substrate in metabolic reactions, such as glycolysis, where it is broken down to release energy.

2. **Neutrine**: This term seems to be a misspelling or confusion with "neutrino," which is a subatomic particle. Neutrinos are not involved in chemical reactions or biological processes as catalysts. They are elementary particles that interact very weakly with matter and have no role in accelerating chemical reactions.

3. **Hormone**: Hormones are signaling molecules produced by glands in multicellular organisms. They regulate physiological processes and behavior by acting as messengers between cells. While hormones can influence the rate of certain reactions by altering enzyme activity, they themselves are not catalysts and do not directly accelerate chemical reactions without being changed.

In summary, enzymes are the only option among the given choices that fit the definition of a protein that accelerates chemical reactions without being changed, making Option 3 the correct answer.