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Ribosomes MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
-
Ribosomes is considered one the most difficult concept.
-
25 Questions around this concept.
Solve by difficulty
DNA is not present in:
Which one of the following structure is an organelle within an organelle?
Which of the following are not membrane - bound ?
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Which one of the following is not an inclusion body found in prokaryotes ?
What is true about ribosomes
Peptide synthesis inside a cell takes place in:
Concepts Covered - 2
Ribosomes
Ribosomes
- The ribosomes are the organelles that are not bound by any membrane.
- These are made up of ribosomal RNA (rRNA) and proteins. Hence, these are ribonucleoprotein particles.
- These may be found attached to the rough endoplasmic reticulum or may be present freely in the cytoplasm.
- Each ribosome is made up of two subunits - a large subunit and a small subunit.
- The ribosomes in eukaryotic cells are of 80S type while in prokaryotic cells they are of 70S types.
- The ‘S’ denotes the Svedberg unit for sedimentation rate that measures shape, size and density of the ribosomes.
- The main function of the ribosome is to perform the translation of the mRNA to form the polypeptide chain.
Difference between 70S and 80S ribosomes:
|
70S Ribosome |
80S Ribosome |
|
Present in prokaryotes, mitochondria and plastids |
Present in eukaryotes |
|
It consists of two subunits: 50S and 30S |
It consists of two subunits: 60S and 40S |
|
It is composed of 60% RNA and 40% proteins |
It is composed of 40% RNA and 60% proteins |
Ribosomes
Ribosomes
- The ribosomes are the organelles that are not bound by any membrane.
- These are made up of ribosomal RNA (rRNA) and proteins. Hence, these are ribonucleoprotein particles.
- These may be found attached to the rough endoplasmic reticulum or may be present freely in the cytoplasm.
- Each ribosome is made up of two subunits - a large subunit and a small subunit.
- The ribosomes in eukaryotic cells are of 80S type while in prokaryotic cells they are of 70S types.
- The ‘S’ denotes the Svedberg unit for sedimentation rate that measures shape, size and density of the ribosomes.
- The main function of the ribosome is to perform the translation of the mRNA to form the polypeptide chain.
Difference between 70S and 80S ribosomes:
|
70S Ribosome |
80S Ribosome |
|
Present in prokaryotes, mitochondria and plastids |
Present in eukaryotes |
|
It consists of two subunits: 50S and 30S |
It consists of two subunits: 60S and 40S |
|
It is composed of 60% RNA and 40% proteins |
It is composed of 40% RNA and 60% proteins |
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