Question

which of the following best matches the description? protein molecule that speeds up the rate of a reaction. select one: a. photosynthesis b. nucleus c. entropy d. base e. respiration f. acid g. latent heat h. potential energy i. combustion j. enzyme k. kinetic energy l. electron m. ion n. isotope o. proton p. ph q. neutron

Explanation:

To solve this, we analyze each option:

• Option a (photosynthesis): A process, not a protein molecule.
• Option b (nucleus): A cell organelle, not a protein molecule.
• Option c (entropy): A thermodynamic concept, not a protein molecule.
• Option d (base): A chemical substance, not a protein molecule.
• Option e (respiration): A process, not a protein molecule.
• Option f (acid): A chemical substance, not a protein molecule.
• Option g (latent heat): A thermal concept, not a protein molecule.
• Option h (potential energy): A form of energy, not a protein molecule.
• Option i (combustion): A chemical reaction, not a protein molecule.
• Option j (enzyme): Enzymes are protein molecules (or RNA in some cases) that act as catalysts to speed up reaction rates.
• Option k (kinetic energy): A form of energy, not a protein molecule.
• Option l (electron): A subatomic particle, not a protein molecule.
• Option m (ion): A charged particle, not a protein molecule.
• Option n (isotope): A variant of an element, not a protein molecule.
• Option o (proton): A subatomic particle, not a protein molecule.
• Option p (pH): A measure of acidity/alkalinity, not a protein molecule.
• Option q (neutron): A subatomic particle, not a protein molecule.

Only option j (enzyme) fits the description of a protein molecule that speeds up reaction rates.

Answer:

j. enzyme