Question

multiple choice question
the carrier molecules of the electron transport system are located in the

outer mitochondrial membrane.
cytoplasm.
cristae.
stroma.

Explanation:

The electron transport chain is a series of protein complexes and electron carriers that transfer electrons from electron donors to electron acceptors via redox reactions. In mitochondria, these carrier molecules are located in the cristae. Cristae are the folds of the inner mitochondrial membrane. The outer mitochondrial membrane is relatively smooth and does not house the electron transport chain. The stroma is part of chloroplasts (involved in photosynthesis), not related to the electron transport chain in mitochondria. The cytoplasm is the jelly - like substance within the cell where many metabolic reactions occur, but the electron transport chain (for cellular respiration in eukaryotes) is located within the mitochondria.

Answer:

cristae.