Arrange the following in the correct sequence: 1. polypeptide chaines move through the rough er and are then carried in vesicles to the golgi apparatus. 2. vesicles are pinched off from the golgi apparatus carrying newly formed proteins to the plasma membrane. 3. the golgi apparatus separates and modifies varieties of proteins and then packages them into vesicles. 4. polypeptide chains are made by ribosomes on the rough er.

The answer is;

4, 1, 3, 2

The rough endoplasmic reticulum (RER) is referred to as ‘rough’ due to the presence of numerous ribosomes on its membrane. When the ribosomes translate proteins, the proteins enter the lumen of the ER and are folded appropriately by the help of chaperones. The proteins travel from the cis to the trans end of the ER during this modification this process. At the trans end they pinch off into vesicle that later join the Golgi apparatus. The protein are modified and packaged in teh Golgi. They then pinch off into vesicles and transported to their site in the cell or to the plasma membrane for exocytosis.  

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.