In mammals, the mitochondrial ribosomes are :-a)55sb)70sc)80sd)100sCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

The correct answer should be - B. As mitochondria is a self autonomous cell organelle.

Answer

In animal cell the mitochondrial tibisomes found are 70s whereas in plants it is 80s. hope this helps. if any doubt refer to ncert it is given in thd ch.

Answer

Ribosomes are made up of ribosomal proteins and ribosomal RNA (rRNA). These are found floating freely in the cytoplasm and they are also attached on the rough endoplasmic reticulum (RER). Some cellular organelles like mitochondria and chloroplast also contain ribosomes. They have their separate machinery for the synthesis of a protein with the help of these ribosomes.
The ribosomes may be of two types on the basis of their sedimentation coefficient expressed in Svedberg unit (S).
-70S ribosome: These ribosomes are found in prokaryotes. They are made up of two ribosomal subunits called 30S and 50S.
-80S ribosome: These ribosomes are found in eukaryotes. They are made up of two subunits 60S and 40S.The mitochondria and chloroplast are similar to the bacterial or prokaryotic cell, hence, they contain 70s type ribosome.
Thus, the correct option is option B - 70S.

Answer

The answer should be B

Answer

C

Answer

In yeast and neurospora ribosomes are 70s type while in mammalian mitochondria they are 55s type.

Answer

The answer should be B.

Answer

Structure of Mitochondrial Ribosomes in Mammals

Mitochondrial ribosomes in mammals are known to have a structure of 70s.

Explanation:

Mitochondrial ribosomes are responsible for protein synthesis within the mitochondria. They are composed of two subunits, the small subunit (28s in prokaryotes and 30s in eukaryotes) and the large subunit (39s in prokaryotes and 50s in eukaryotes). When these two subunits come together, they form a complete ribosome with a sedimentation coefficient of 70s in mammals.

Comparison with other organisms:

- In prokaryotes, the mitochondrial ribosomes are typically 70s in size, similar to those found in bacteria.
- In eukaryotic cells outside of mitochondria, the ribosomes are 80s in size, with a small subunit of 40s and a large subunit of 60s.

Importance of 70s mitochondrial ribosomes in mammals:

The structure of 70s mitochondrial ribosomes in mammals is crucial for the proper functioning of these organelles. These ribosomes are responsible for synthesizing proteins that are essential for various cellular processes, including energy production and metabolism. Understanding the structure of these ribosomes can provide valuable insights into mitochondrial function and dysfunction in diseases.

In conclusion, the mitochondrial ribosomes in mammals have a sedimentation coefficient of 70s, which is a characteristic feature of these organelles. This structure plays a vital role in protein synthesis within the mitochondria, highlighting the importance of these ribosomes in cellular function.

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