Multiple Choice
NAD+ becomes NADH through which of the following processes?
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3. Energy
Activated Carriers
Multiple Choice
In the context of activated carriers, which molecule is commonly described as the primary energy currency of the cell?
A
Acetyl-CoA (acetyl coenzyme A)
B
ATP (adenosine triphosphate)
C
NADH (nicotinamide adenine dinucleotide, reduced form)
D
FADH2 (flavin adenine dinucleotide, reduced form)
Verified step by step guidance1
Step 1: Understand the concept of activated carriers in cellular metabolism. Activated carriers are molecules that store and transfer energy or specific chemical groups within the cell to drive various biochemical reactions.
Step 2: Identify the role of each molecule listed: Acetyl-CoA carries acetyl groups for biosynthetic reactions; NADH and FADH2 carry electrons for the electron transport chain; ATP stores and transfers energy in the form of high-energy phosphate bonds.
Step 3: Recognize that the primary energy currency of the cell is the molecule that directly provides energy for most cellular processes through the hydrolysis of its high-energy phosphate bonds.
Step 4: Recall that ATP (adenosine triphosphate) is the molecule that fulfills this role by releasing energy when its terminal phosphate bond is broken, making it the main energy carrier in cells.
Step 5: Conclude that among the options given, ATP is commonly described as the primary energy currency of the cell because it directly powers many cellular activities.
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