Explain the relationship between electron transport and oxidative phosphorylation. How do uncoupling proteins 'uncouple' this relationship in brown adipose tissue?

The electron transport chain ________.

a. Is located in the matrix of the mitochondrion.

b. Has the electronegative carbon dioxide at its base.

c. Is a series of nucleotides located in the inner mitochondrial membrane.

d. Is a series of enzymes located in the intermembrane space.

e. Moves electrons from protein to protein and moves protons from the matrix into the intermembrane space.

The researchers who observed that magnetite was produced by bacterial cultures from the deep subsurface carried out a follow-up experiment. These biologists treated some of the cultures with a drug that poisons the enzymes involved in electron transport chains. In cultures where the drug was present, no more magnetite was produced. Does this result support or undermine their hypothesis that the bacteria in the cultures perform cellular respiration? Explain your reasoning.

Cyanide (C ≡ N⁻) blocks complex IV of the electron transport chain. Suggest a hypothesis for what happens to the ETC when complex IV stops working. Your hypothesis should explain why cyanide poisoning in humans is fatal.