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.
Lysosomes are single membraned organelles which are involved in intracellular digestion with the membrane bound lytic enzymes (lysis= to break, hence the name lysosome) in the acidic lysosomal lumen. These organelles, in time of distress, can engulf the cell itself, hence also called as âsuicidal bags of the cellâ.