A) nucleus
B) mitochondrion
C) endoplasmic reticulum
D) lysosome
Correct Answer: C
Solution :
: Endoplasmic reticulum is a 3-dimensional, complicated and interconnected system of membrane - lined channels filled with endoplasmic matrix that runs through cytoplasm. At places it is connected with plasma lemma as well as nuclear envelope. It exists in three forms - cisternae, vesicles and tubules. Cisternae are flattened, unbranched, sac-like elements which lie in stacks, inter-connected and parallel to one another which bear ribosomes on the surface, Tubules are tube-like extensions which may be connected with cisternae or vesicles to form a reticular system. Vesicles are oval or rounded, vacuole-like elements which often occur isolated in the cytoplasmic matrix.
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