From the list below, select all options that are accurate regarding the electron

Question

From the list below, select all options that are accurate regarding the electron transport chain (ETC) and the energy derived from this collection of molecules.

Question 9 options:

the molecules that comprise the ETC are embedded in the inner membranes of the cell's mitochondria

the proteins that are in the ETC can exist in either or oxidized or reduced forms; they become reduced when the accept electrons and oxidized when they pass those electrons to another molecule or atom

molecules of reduced NAD (i.e. (NADH) and reduced FAD (i.e. FADH2) feed pairs of hydrogen atoms to the proteins of the ETC

the proteins of the ETC accept and pass the electrons derived from the hydrogen atoms donated by reduced NAD and reduced FAD to subsequent proteins in the chain or to the final electron acceptor for the chain

when electrons are removed from the hydrogen atoms that were donated by molecules of NADH and FADH2, what remains of the hydrogen atoms are positively-charged hydrogen ions (i.e. H+); some proteins of the ETC are proton pumps that pump these H+ into the inter-membrane space that exists between the inner and outer mitochondrial membranes

the final complex of the ETC passes electrons to the final electron acceptor - which is an atom of oxygen

the final complex of the ETC also serves as a channel that lets H+ in the intermembrane space flow back into the matrix, which releases free energy to the cell

the final complex of the ETC captures the free energy released by the flow of H+ from the inter-membrane space back into the mitochondrial matrix and uses that energy to phosphorylate molecules of ADP - generating molecules of ATP by oxidative phosphorylation in the process

for every molecule of NADH that feeds hydrogen atoms to and whose electrons flow through the ETC - 2.5-3.0 molecules of ATP are generated by oxidative phosphorylation

for every molecule of FADH2 that feeds hydrogen atoms to and whose electrons flow through the ETC - 1.5-2 molecules of ATP are generated by oxidative phosphorylation

A)

the molecules that comprise the ETC are embedded in the inner membranes of the cell's mitochondria

B)

the proteins that are in the ETC can exist in either or oxidized or reduced forms; they become reduced when the accept electrons and oxidized when they pass those electrons to another molecule or atom

C)

molecules of reduced NAD (i.e. (NADH) and reduced FAD (i.e. FADH2) feed pairs of hydrogen atoms to the proteins of the ETC

D)

the proteins of the ETC accept and pass the electrons derived from the hydrogen atoms donated by reduced NAD and reduced FAD to subsequent proteins in the chain or to the final electron acceptor for the chain

E)

when electrons are removed from the hydrogen atoms that were donated by molecules of NADH and FADH2, what remains of the hydrogen atoms are positively-charged hydrogen ions (i.e. H+); some proteins of the ETC are proton pumps that pump these H+ into the inter-membrane space that exists between the inner and outer mitochondrial membranes

F)

the final complex of the ETC passes electrons to the final electron acceptor - which is an atom of oxygen

G)

the final complex of the ETC also serves as a channel that lets H+ in the intermembrane space flow back into the matrix, which releases free energy to the cell

H)

the final complex of the ETC captures the free energy released by the flow of H+ from the inter-membrane space back into the mitochondrial matrix and uses that energy to phosphorylate molecules of ADP - generating molecules of ATP by oxidative phosphorylation in the process

I)

for every molecule of NADH that feeds hydrogen atoms to and whose electrons flow through the ETC - 2.5-3.0 molecules of ATP are generated by oxidative phosphorylation

J)

for every molecule of FADH2 that feeds hydrogen atoms to and whose electrons flow through the ETC - 1.5-2 molecules of ATP are generated by oxidative phosphorylation

Explanation / Answer

(A) The molecules that comprise the ETC are embedded in the inner membranes of the cell's mitochondria

(B) the proteins that are in the ETC can exist in either or oxidized or reduced forms; they become reduced when the accept electrons and oxidized when they pass those electrons to another molecule or atom

(C) molecules of reduced NAD (i.e. (NADH) and reduced FAD (i.e. FADH2) feed pairs of hydrogen atoms to the proteins of the ETC

(E) when electrons are removed from the hydrogen atoms that were donated by molecules of NADH and FADH2, what remains of the hydrogen atoms are positively-charged hydrogen ions (i.e. H+); some proteins of the ETC are proton pumps that pump these H+ into the inter-membrane space that exists between the inner and outer mitochondrial membranes

(F) the final complex of the ETC passes electrons to the final electron acceptor - which is an atom of oxygen

(H) the final complex of the ETC captures the free energy released by the flow of H+ from the inter-membrane space back into the mitochondrial matrix and uses that energy to phosphorylate molecules of ADP - generating molecules of ATP by oxidative phosphorylation in the process

(J) for every molecule of FADH2 that feeds hydrogen atoms to and whose electrons flow through the ETC - 1.5-2 molecules of ATP are generated by oxidative phosphorylation

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