Question

Differentiate between Rough and Smooth Endoplasmic Reticulum.

Answer 1

Smooth Endoplasmic Reticulum (SER)

• Ribosomes - Absent
• Position - Mainly present near the cell membrane.
• Occurrence - Mainly found in lipid forming cells e;g., adipocytes (Fat cells), interstitial cells (of testis), adrenal cortical cells, glycogen storing cells of liver, muscle cells, leucocytes etc.
• Origin - Formed from RER by loss of ribosomes.
• Component - Mainly formed of tubules.

Rough Endoplasmic Reticulum (RER)

• Ribosomes - Present and is also called α-cytomembrane.
• Position - Mainly present near the nucleus
• Occurrence - Mainly found in protein forming cells e;g., pancreatic acinal cells, globlet cells, plasma cells(produce antibodies), Nissl’s granules of nerve cells etc.
• Origin - Formed from nuclear membranes.
• Component - Mainly formed of cisternae.

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Answer 2

Explanation:

RER looks rough under a microscope becoz it has particles called ribosomes........