AP BIOLOGY

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LABORATORY REVIEW

CELL RESPIRATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Many electrons are excited during the first two phases of cellular respiration. These electrons hitch a ride on special electron carriers and are dropped off at the Electron Transport Chain. These electrons travel down the ETC and eventually get oxidized. Once this happens, O2 gets converted into ____
A
C6H12O6
B
H2O
C
CO2
D
O2
Explanation: 

Detailed explanation-1: -It takes place in the folds of the inner membrane of the mitochondria. These folds are called cristae. In this step, electron carriers NADH and FADH2 drop off the electrons they’ve carried from the citric acid cycle. This drop-off allows a large amount of ATP to form.

Detailed explanation-2: -To start, two electrons are carried to the first complex aboard NADH. This complex, labeled I, is composed of flavin mononucleotide (FMN) and an iron-sulfur (Fe-S)-containing protein.

Detailed explanation-3: -The second stage of cellular respiration is the transfer of the energy in pyruvate, which is the energy initially in glucose, into two energy carriers, NADH and FADH2. A small amount of ATP is also made during this process.

Detailed explanation-4: -NADH donates two electrons to NADH dehydrogenase. At the same time, the complex also pumps two protons from the matrix space of the mitochondria into the intermembrane space. The two electrons are now transferred to the mobile carrier protein known as ubiquinone.

There is 1 question to complete.
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