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 lysosome is a sac of digestive enzymes, used to break down  monosaccharaides and disaccharides. Lysosomes are found in animal  cells and are also called suicide sacs. 1 person found this useful.Edit. lysosome is a sac of digestive enzymes, used to break down  monosaccharaides and disaccharides. Lysosomes are found in animal  cells and are also called suicide sacs. 1 person found this useful. Edit.