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Proteins can assemble to form large complexes that work coordinately, like moving parts inside a single machine. Which of the following steps in modulating the activity of a complex protein machine is least likely to be directly affected by ATP or GTP hydrolysis?

(a) translation of protein components
(b) conformational change of protein components
(c) complex assembly
(d) complex disassemble

User Orbitory
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Final answer:

While ATP and GTP hydrolysis provide energy for various stages in protein complex functions, translation of protein components is least likely to be directly affected by such hydrolysis since energy for peptide bond formation is primarily from GTP, not from ATP or GTP modulation of translation machinery itself.

Step-by-step explanation:

Proteins are complex molecules that are crucial for nearly every function in living organisms. They are composed of amino acids linked by peptide bonds. The synthesis of proteins is an energy-intensive process, requiring ATP for forming aminoacyl-tRNA complexes during translation and often GTP for providing the energy to form the initiation complex. Conformational changes in protein components, complex assembly, and complex disassembly are also processes that typically involve hydrolysis of ATP or GTP for energy. However, the translation of protein components is the stage that is least likely to be directly affected by ATP or GTP hydrolysis, as the energy for peptide bond formation during this process primarily comes from GTP hydrolysis, not directly from ATP or GTP modulation of translation machinery itself.

During translation, various enzymatic factors are involved, and while ATP is used for tRNA charging, GTP is more directly involved in peptide bond formation and the translation process. Though energy is certainly required for translation, the modulation of translation initiation through mechanisms such as phosphorylation of eIF-2 is not a direct result of ATP or GTP hydrolysis. Therefore, it could be argued that the aspect of translation of protein components is least likely to be directly affected by ATP or GTP hydrolysis compared to the other options given.

User Snumpy
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