Wednesday, 27 July 2016


The eukaryotic cell is compartmentalized due to network of organelles called endoplasmic reticulum. The organelle with both protein synthesis and distribution is endoplasmic reticulum.

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1) Which organelle is considered as the cytoskeleton?
A) Endoplasmic Reticulum
2) Who discovered ER?
A) KE Porter
3) What are the flattened saccular expansions of ER?
A) Cisternae
4) What are the protein cargoes of ER?
A) Vesicles
5) How are the tubular structures of ER described?
A) Anastomosing Tubules
6) How is the ribosomes bearing ER called?
A) Rough Endoplasmic Reticulum (RER) or Granular Endoplasmic Reticulum
7) How is the complex structure of ER with polysomes described?
A) Ergastoplasm
8) How is the ER without ribosomes called?
A) Smooth Endoplasmic Reticulum  (SER)
9) Which part of the nucleus does form continuity with ER?
A) Nuclear Envelope
10) What kind of plant cells have very high concentration of ER?
A) Meristems
11) How is ER of striated muscle cells called?
A) Sarcoplastic Reticulum
12) What kind of cells never have ER?
A) Prokaryotic cells
13) What are the different human or mammalian cells without ER?
A) Ova, Embryos and RBC
14) What is the chief function of RER?
A) Protein Synthesis
15) What are the different kinds of lipids synthesized by SER?
A) Cholesterol and Steroids
16) Name the intercellular connections traversed by ER  in plant tissues?
A) Plasmodesmata
17) Which structural property of ER results in isolation of biochemical substances in cells?
A) Compartmentalization
18) Which cell organelle is in close proximity to ER other than nucleus?
A) Golgi apparatus
19) How are the ribosomes on RER called?
A) Membrane bound ribosomes
20) Where does protein folding  take place in ER?
A) Lumen
21) What kind of ions are supplied to striated muscles through ER?
A) Calcium ions

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