Question

1. Membrane-associated translocators are responsible for importing polypeptides into both mitochondria and peroxisomes. The processes in the two organelles are different because _______________.

   		mitochondria have only one membrane translocator complex and peroxisomes have two
   		polypeptides are unfolded during translocation into mitochondria but not peroxisomes
   		mitochondrial polypeptides bind to cytosolic receptors or chaperones and peroxisomal polypeptides do not
   		peroxisome import requires signal sequences while mitochondrial import does not

2. Match each event in glycolysis with the correct description.

   First ATP investment step Second ATP investment step First step of cleavage stage Substrate-level phosphorylation

   A. Main point of allosteric regulation in the pathway B. Raises the free energy of glucose and traps it in the cell C. Transfers a phosphoryl group from an organic intermediate to ADP D. Produces two 3-carbon molecules that are similar but not identical

Answer 1

The answer to question one is number 2 "polypeptides are unfolded during translocation into mitochondria but not peroxisome". During the translocation of the polypeptide to mitochondria, this needs to be unfolded to permit the pas through the mitochondrial membrane during the post-translational translocation. This process is similar in chloroplasts that are a similar organelle on plants.

Exercise of the match the sentences.

First ATP investment step with the letter D. Is necessary to phosphorylate the glucose to produce glucose 6-phosphate and initiate the glycolisis.

Second ATP investment step with letter A.When the fructose-6-phosphate is phosphorylated by phosphofructokinase into fructose-1,6-bisphosphate, occurs a possible allosteric inhibition by ATP that is activate by AMP.

The first step of cleavage stage letter B.

Substrate-level phosphorylation with letter C. When the pyruvate kinase transfers a P molecule to the ADP it becomes to ATP.