Help please Identify the processes that occur during the electron transport chain.

Select all that apply.

- Protons are moved across a membrane against their concentration gradient.
- Carbon dioxide is released.
- Oxygen is produced as a waste product.
- Electrons are removed from the carrier molecules NADH and FADH2.

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.