ER Structure: RER vs. SER Key Difference
The Endoplasmic Reticulum (ER) is a network of membranes within eukaryotic cells. It exists in two forms:
- Rough Endoplasmic Reticulum (RER): Studded with ribosomes on its outer surface. Involved primarily in protein synthesis and modification.
- Smooth Endoplasmic Reticulum (SER): Lacks ribosomes. Involved in lipid synthesis, detoxification, and calcium storage.
Identifying the Main Distinction
The presence or absence of ribosomes is the fundamental difference distinguishing RER from SER. Ribosomes attached to the RER surface give it a 'rough' appearance and enable it to synthesize proteins destined for secretion or insertion into membranes.
Therefore, the key difference lies in the attachment of ribosomes.
The correct option is 4. ribosomes.
Important Questions from Genetics and Evolution
Which one of the following is a nonsense codon in universal code?
Which one of the following is an example of Analogous organs?
Which base of a codon is called wobble base?
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
Pair of genes that occupy a specific location on a particular chromosome and control the same trait is termed as _________.
