Which of the following statements about NAD or NADH is FALSE?
a) NAD is converted to NADH during both glycolysis and the Krebs cycle
b) NAD possesses more chemical energy than NADH
c) NAD picks up hydrogen ion (H+) and electrons removed from food, and drops them off at the electron transport chain
d) glycolysis cannot function without NAD
e) a molecule of NADH possesses more energy than a molecule of ATP
http://en.wikipedia.org/wiki/Nicotinamide_adenine_dinucleotide
As you read the above article,remember that reducing means gaining energy.
To determine which statement is FALSE, we can analyze each statement and find the one that does not align with the information provided in the source.
a) NAD is converted to NADH during both glycolysis and the Krebs cycle: This statement is true. NAD+ is reduced to NADH during both glycolysis and the Krebs cycle, allowing it to accept electrons and hydrogen ions.
b) NAD possesses more chemical energy than NADH: This statement is false. NADH possesses more chemical energy than NAD+. NADH is the reduced form and carries high-energy electrons that can be used in the electron transport chain to produce ATP.
c) NAD picks up hydrogen ions (H+) and electrons removed from food, and drops them off at the electron transport chain: This statement is true. NAD+ acts as an electron carrier, picking up hydrogen ions and electrons removed during the breakdown of food molecules and delivering them to the electron transport chain.
d) Glycolysis cannot function without NAD: This statement is true. In glycolysis, NAD+ is converted to NADH when accepting electrons, allowing glycolysis to continue. Without NAD+, this process would be inhibited.
e) A molecule of NADH possesses more energy than a molecule of ATP: This statement is true. NADH carries high-energy electrons that can be used to generate ATP through oxidative phosphorylation in the electron transport chain. ATP, on the other hand, is a molecule that stores and releases energy but does not directly participate in redox reactions.
Therefore, the FALSE statement is b) NAD possesses more chemical energy than NADH. According to the information provided in the source, NADH possesses more chemical energy than NAD+.