Multiple Choice
The energy to insert proteins through the TIM/TIC complex comes from what reaction?
13. Intracellular Protein Transport
Targeting Proteins to the Mitochondria and Chloroplast
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True or False:Proteins must remain intact in order to cross the membrane and enter the mitochondria or chloroplast?
A
True
B
False
Verified step by step guidance1
Understand the structure and function of mitochondria and chloroplasts. Both organelles have double membranes and are involved in energy conversion processes within the cell.
Learn about protein targeting and import mechanisms. Proteins destined for mitochondria or chloroplasts are synthesized in the cytosol and contain specific signal sequences that direct them to the correct organelle.
Explore the role of translocases. Proteins are imported into mitochondria and chloroplasts through translocase complexes located in the membranes of these organelles.
Recognize that proteins often unfold to cross membranes. The translocase complexes facilitate the unfolding of proteins so they can pass through the narrow channels in the organelle membranes.
Conclude that proteins do not need to remain intact (folded) to enter mitochondria or chloroplasts. They can unfold, cross the membrane, and then refold once inside the organelle.
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