To show that lines are parallel, we draw small arrow marks on them. In the figure above, note the arrows on the lines PQ and RS. When we write about parallel lines there is a shorthand we can use. We can write which is read as the line segment PQ is parallel to the segment RS.
Lysosome[edit] Lysosomes are spherical bodies, or vacuoles that are enclosed by a single membrane. The membrane serves as a protectorate to the cell, since lysosomes contain harsh digestive enzymes, which would cause significant damage if exposed to cell content.
A simple description of lysosomes is that they are tiny sacs filled with fluid containing enzymes (i.e. proteins that act as biological catalysts) which enable the cell to process its nutrients and are also responsible for destroying the cell after it has died.anging in diameter from approx. 50nm to 1 Î¼m Â§ , lysosomes have a single outer membrane consisting of a phospholipid bilayer and contain acid hydrolases which are enzymes capable of breaking-down macromolecules. Â§ i.e. 50x10-9m to 1x10-6m, which is the same as 0.00005 to 0.001 mm (millimetres).