AP BIOLOGY

CELL RESPIRATION

THE KREBS CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The energy of the electrons passing along the electron transport chain is directly used to
A
make lactic acid
B
make citric acid
C
transport H+ ions
D
split water molecules
Explanation: 

Detailed explanation-1: -As electrons are passed down the chain, they move from a higher to a lower energy level, releasing energy. Some of the energy is used to pump H +start superscript, plus, end superscript ions, moving them out of the matrix and into the intermembrane space.

Detailed explanation-2: -The electrons are passed through a series of redox reactions, with a small amount of free energy used at three points to transport hydrogen ions across a membrane. This process contributes to the gradient used in chemiosmosis.

Detailed explanation-3: -The flow of electrons through the electron transport chain is an exergonic process. The energy from the redox reactions creates an electrochemical proton gradient that drives the synthesis of adenosine triphosphate (ATP).

There is 1 question to complete.