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Question

Ribosomes are attached to the endoplasmic reticulum through a glycoprotein known as Ribophorin I and II. Which subunit of ribosomes gets attached to the endoplasmic reticulum?


A

Large subunit

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B

Small subunit

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C

tRNA

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D

mRNA

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Solution

The correct option is A

Large subunit


The correct option is A.

The explanation for the correct option:

  1. Ribosomes are the smallest organelle, regarded as organelle within the organelle.
  2. Ribosomes consist of two parts the bigger one is dome shape and the smaller one is cap-shaped.
  3. Ribophorin, also known as a ribosome receptor protein, is a transmembrane glycoprotein that aids in the binding of ribosomes to the endoplasmic reticulum's outer surface, generating rough endoplasmic reticulum.
  4. They attach the ribosome's larger subunit (the 50S) to the rough endoplasmic reticulum.

Explanations for incorrect options:

Option B:

The smaller ribosome subunit primarily interprets the genetic message and also attaches to mRNA.

Option C:

tRNA, or transfer RNA, is a short RNA molecule involved in protein synthesis that transports amino acids to the location of protein synthesis during the translation process.

Option D:

Messenger RNA, or mRNA, acts as a link between proteins and DNA, carrying the coding code for protein production.

Final Answer: Ribosomes are attached to the endoplasmic reticulum through a glycoprotein known as Ribophorin I and II. A larger subunit of ribosomes gets attached to the endoplasmic reticulum.


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