Textbook Question
Which of the following cannot pass through the membrane without the help of a membrane protein?a. carbon dioxide;b. water;c. oxygen;d. charged molecules
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2. Cell Chemistry & Cell Components
Active Transport
Multiple Choice
Which molecule is primarily used as an energy source in active transport?
A
FADH2 (Flavin Adenine Dinucleotide)
B
ATP (Adenosine Triphosphate)
C
GTP (Guanosine Triphosphate)
D
NADH (Nicotinamide Adenine Dinucleotide)
Verified step by step guidance1
Understand the concept of active transport: Active transport is a process that moves molecules across a cell membrane against their concentration gradient, requiring energy input.
Identify the role of ATP in cellular processes: ATP (Adenosine Triphosphate) is the primary energy carrier in cells, providing the necessary energy for various biological functions, including active transport.
Compare ATP with other molecules listed: FADH2, GTP, and NADH are involved in energy transfer and cellular respiration, but they are not the primary energy source for active transport.
Recognize the importance of ATP hydrolysis: During active transport, ATP is hydrolyzed to ADP (Adenosine Diphosphate) and inorganic phosphate, releasing energy that powers the transport proteins.
Conclude that ATP is the molecule primarily used as an energy source in active transport, as it directly provides the energy needed for the process.
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