Multiple Choice
Kinesins move molecules away from the cell body
15. Cytoskeleton and Cell Movement
Kinesins and Dyneins
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Where do motor proteins get the energy to move molecules throughout the cell?
A
ATP
B
GTP
C
Breakdown of H2O
D
Breakdown of sugars
Verified step by step guidance1
Understand the role of motor proteins: Motor proteins are essential for transporting molecules and organelles within the cell. They move along cytoskeletal filaments, such as microtubules and actin filaments, using energy to facilitate this movement.
Identify the energy source for motor proteins: Motor proteins require energy to perform their function. This energy is typically derived from the hydrolysis of nucleotides.
Focus on ATP: Adenosine triphosphate (ATP) is the primary energy currency of the cell. Many motor proteins, such as kinesins and dyneins, use the energy released from ATP hydrolysis to change their conformation and move along microtubules.
Consider GTP: Guanosine triphosphate (GTP) is another nucleotide that can provide energy for certain cellular processes. However, in the context of motor proteins, ATP is more commonly used than GTP.
Evaluate other options: The breakdown of H2O (water) and sugars can release energy, but these processes are not directly used by motor proteins for movement. Instead, they are part of broader metabolic pathways that ultimately produce ATP.
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