For Each of the Following Sentences, Fill in the Blanks

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below.Not all words or phrases will be used; each word or phrase should be used only once.
$\begin{array}{lll}\text { cytochrome } b-c_{1} \text { complex } & \text { oxidation } & \text { second } \\\text { cytochrome } c & \text { oxidation-reduction } & \text { the } \\\text { cytochrome } c \text { oxidase } & \text { phosphorylation } & \text { third } \\\text { first } & \text { plastoquinone } & \text { uniquinone } \\\text { NADH dehydrogenase } & \text { reduction } &\end{array}$

NADH dehydrogenase reduction
NADH donates electrons to the __________ of the three respiratory enzyme complexes in the mitochondrial electron-transport-chain.__________ is a small protein that acts as a mobile electron carrier in the respiratory chain.__________ transfers electrons to oxygen.Electron transfer in the chain occurs in a series of __________ reactions.The first mobile electron carrier in the respiratory chain is __________.