Even though peroxisomes, chloroplasts and mitochondria import proteins via a tra
ID: 322120 • Letter: E
Question
Even though peroxisomes, chloroplasts and mitochondria import proteins via a translocon complex they do it differently. Which of the following is TRUE about protein import into specialized organelles?
Multiple answers: You can select more than one option
A peroxisome uses a single translocator complex because they are single membrane compartments while chloroplasts and mitochondria use two translocator complexes to transport proteins across two membrane lipid bilayers
B chloroplasts and mitochondria denature proteins while transporting them across TOC/TIC or TOM/TIM complexes
C chloroplast targeted proteins sometimes have two signal peptides one to deposit the protein in the stroma and another to further transport the protein to the thylakoid membrane space
D in mitochondria if a protein has one or more transmembrane domains it is not released in the mitochondrial matrix space but rather diverted to the mitochondrial inner membrane
E TOM/TIM and TOC/TIC translocator complexes are responsible for the denaturation and renaturation of proteins that translocate through mitochondria and chloroplasts
*Pls don't bother answering if you are not 100% sure your answer is correct, Thanks*
Explanation / Answer
True statements are:
A peroxisome uses a single translocator complex because they are single membrane compartments while chloroplasts and mitochondria use two translocator complexes to transport proteins across two membrane lipid bilayers
B Chloroplasts and mitochondria denature proteins while transporting them across TOC/TIC or TOM/TIM complexes
C chloroplast targeted proteins sometimes have two signal peptides one to deposit the protein in the stroma and another to further transport the protein to the thylakoid membrane space
D in mitochondria if a protein has one or more transmembrane domains it is not released in the mitochondrial matrix space but rather diverted to the mitochondrial inner membrane