CELL RESPIRATION
ATP ADENOSINE TRIPHOSPHATE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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DNA Helicase that separates DNA during its replication
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The molecular motor that powers flagella
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The RNA Polymerase molecule that transcribes mRNA
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The molecular motor that powers cilia
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Detailed explanation-1: -The motor is fueled by an inward-directed electrochemical gradient of protons or sodium ions across the cytoplasmic membrane. The motor consists of a rotor, a drive shaft, a bushing, and about a dozen stator units. The flagellar protein export apparatus is located at the cytoplasmic side of the rotor.
Detailed explanation-2: -There is good evidence that the bacterial flagellum has evolved from a Type III secretory and transport system, given the similarity of proteins in both systems. All currently known nonflagellar Type III transport systems serve the function of exporting (injecting) toxin into eukaryotic cells.
Detailed explanation-3: -The movements of cilia and flagella result from the sliding of outer microtubule doublets relative to one another, powered by the motor activity of axonemal dynein (Figure 11.53).
Detailed explanation-4: -Dyneins are motor proteins that drive the movement of the cilia and flagella. Dyneins can cause filaments to slide past each other causing a beating movement, as in cilia, or they can cause the filaments to bend as in the flagella.