AP Biology : Understanding the Electron Transport Chain
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Example Question #291 : Ap Biology
Why does FADH2 produce less ATP then NADH?
FADH2 produces less ATP then NADH because FADH2 is reduced more.
FADH2 produces less ATP then NADH because the electrons for FADH2 are dropped off at the second protein of the electron transport chain.
FADH2 produces less ATP then NADH because FADH2 produces a larger proton gradient.
FADH2 produces less ATP then NADH because NADH has more energetic electrons.
FADH2 produces less ATP then NADH because NADH is reduced more.
FADH2 produces less ATP then NADH because the electrons for FADH2 are dropped off at the second protein of the electron transport chain.
FADH2 is directly attached onto the second protein of the electron transport chain and therefore the electrons of FADH2 (electron carrier) are dropped off at the second protein not the first. As a result, the electrons from FADH2 do not pump as much electrons across the membrane as NADH. This results in a lower proton gradient created from FADH2 then NADH and therefore less ATP production from FADH2.
Example Question #292 : Ap Biology
What driving force creates most of the ATP in cellular respiration?
the movement of electrons through the electron transport chain
the movement of sodium down its concentration gradient
the movement of protons down its concentration gradient
the movement of FADH2 down its concentration gradient
the movement of NADH down its concentration gradient
the movement of protons down its concentration gradient
Remember that NADH and FADH2 are electron carriers and do not directly create any energy. The movement of the electrons through the electron transport chain also does not create energy directly, but does create a proton gradient that is later used to create energy. The movement of protons down its proton gradient through ATP synthase does, however, generate energy. It actually generates around 30 ATP molecules per one glucose.
Example Question #291 : Ap Biology
Which process occurs in both cellular respiration and photosynthesis?
lactic acid fermentation
chemiosmosis
glycolysis
Oxidation of Glucose
Calvin Cycle
chemiosmosis
In both cellular respiration and photosynthesis, chemiosmosis occurs. Chemiosmosis is the process in which the creation of a proton gradient leads to the transport of proton down its concentration gradient to produce ATP. This occurs in the electron transport chain in both mitochondrias and chloroplast. In the photosynthesis it occurs when the electron is transported from photosystem II to photosystem I.
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