Multiple Choice
Which term describes enzyme regulation controlled through binding of a second molecule to a different site on the enzyme?
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3. Energy
Activated Carriers
Multiple Choice
In cell biology, which activated carrier molecule most directly provides the energy to fuel many forms of active transport across membranes?
A
NADH
B
cAMP
C
ATP
D
FADH2
Verified step by step guidance1
Step 1: Understand the concept of active transport in cell biology. Active transport is the movement of molecules across a cell membrane against their concentration gradient, which requires an input of energy.
Step 2: Identify the source of energy for active transport. Cells use specific molecules called activated carrier molecules to provide this energy.
Step 3: Review the roles of the given molecules: NADH and FADH2 primarily function in cellular respiration to carry electrons, cAMP acts as a secondary messenger in signal transduction, and ATP is known as the primary energy currency of the cell.
Step 4: Recognize that ATP (adenosine triphosphate) directly provides energy by hydrolyzing its high-energy phosphate bonds, which is used to power many cellular processes including active transport.
Step 5: Conclude that among the options, ATP is the activated carrier molecule that most directly provides the energy to fuel many forms of active transport across membranes.
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