Which letter identifies the structure that makes proteins lipids and other materials and that contains tubes and passageways that enable substances to move to different places in the cell?

What is the difference between kinetochore and centromere? What Membrane-enclosed organelles modifies sorts and packages proteins destined for other regions of the cell (? Why dead sea special? Why are object heavier on earth than on the moon? Differences between annulospiral and flower ending? Is mount baker active? What is a nonconducting solid? Why study natural science? Why is profiling wrong? Where can you find an image of the cornea of the eye? Can souffle batter be prepared ahead? How long did it take Marie curie to make the X-ray? How many unpaired electrons are present in an oxide ion? What happens to your body if you have lack of iron? What is polarity in plant propagation? What is the function of rays in the pine stems? Can you use bricks in a gas fire pit? Where are the lowest and highest atomic numbers found in the periodic table? What kind of chemical bond will occur between 2 halogens? A diagonal pattern on an H-R diagram where most stars lie is called?

Which letter identifies the structure that makes proteins lipids and other materials and that contains tubes and passageways that enable substances to move to different places in the cell?