Multiple Choice
True or False:Proteins must remain intact in order to cross the membrane and enter the mitochondria or chloroplast?
13. Intracellular Protein Transport
Targeting Proteins to the Mitochondria and Chloroplast
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The energy to insert proteins through the TIM/TIC complex comes from what reaction?
A
ATP hydrolysis
B
H+ gradient
C
GTP hydrolysis
D
Ca2+ influx into the mitochondria or chloroplast
Verified step by step guidance1
Understand the context: The TIM/TIC complex is involved in the translocation of proteins across the inner membranes of mitochondria and chloroplasts.
Identify the energy source: Protein translocation through these complexes is often driven by an electrochemical gradient.
Focus on the H+ gradient: In mitochondria and chloroplasts, the proton (H+) gradient across the membrane is a key energy source.
Relate to chemiosmosis: The H+ gradient is established by the electron transport chain and is used in processes like ATP synthesis, but also provides energy for protein translocation.
Conclude the mechanism: The energy from the H+ gradient is harnessed to drive the conformational changes necessary for proteins to be inserted through the TIM/TIC complex.
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