Which of the following organelles does not have a cell membrane?

State whether the following statement is true or false:
$RER$ looks smooth under a microscope because it has particles called ribosomes attached to its surface.

Which organelle is known as the powerhouse of the cell? Why?

List the specific functions of the following:
$(i)$ Rough endoplasmic reticulum
$(ii)$ Golgi apparatus
$(iii)$ Lysosomes
$(iv)$ Mitochondria
$(v)$ Plastids
$(vi)$ Vacuoles

Expand the following:
$(i)$ $RER$
$(ii)$ $SER$
$(iii)$ $DNA$
$(iv)$ $RNA$
$(v)$ $ATP$
$(vi)$ $SPM$

Name the cell organelle responsible for intracellular transport.