Multiple Choice
Which of the following cellular processes requires an input of energy?
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7. Energy and Metabolism
Introduction to Energy
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Which of the following activities would least likely require ATP?
A
Active transport of ions
B
Diffusion of oxygen across a cell membrane
C
Synthesis of proteins
D
Muscle contraction
Verified step by step guidance1
Step 1: Understand the role of ATP in cellular processes. ATP (adenosine triphosphate) is the primary energy currency of the cell, used to power various energy-requiring activities such as active transport, synthesis of macromolecules, and muscle contraction.
Step 2: Analyze each activity listed in the problem. Active transport of ions requires ATP because it involves moving ions against their concentration gradient, which is an energy-demanding process.
Step 3: Consider the synthesis of proteins. Protein synthesis is an anabolic process that requires energy input, often provided by ATP, to form peptide bonds and assemble amino acids into polypeptides.
Step 4: Examine muscle contraction. Muscle contraction involves the sliding of actin and myosin filaments, which requires ATP for the detachment and reattachment of myosin heads during the contraction cycle.
Step 5: Evaluate diffusion of oxygen across a cell membrane. Diffusion is a passive process that does not require ATP because it relies on the natural movement of molecules from an area of higher concentration to an area of lower concentration.
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