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Ribosomes of Prokaryotic Cell

Which is a tr...

Question

Which is a true statement about ribosomes?

A

Ribosomes contain DNA and protein.

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B

Ribosomes are active in carbohydrate synthesis.

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C

Ribosomal subunits leave the nucleus after being formed by the nucleolus.

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D

80 s ribosomes are found in prokaryotes.

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Solution

The correct option is C Ribosomal subunits leave the nucleus after being formed by the nucleolus.
Ribosomes dont have DNA.Ribosomes synthesize proteins not carbohydrates70 S s ribosomes are found in prokaryotes.Ribosomal subunits leave the nucleus after being formed by the nucleolus as they help in protein synthesis that occurs in cytoplasm.

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Q. Pick up the correct statements.
1. Mitochondrion contains DNA.
2. 70 S ribosomes occur in prokaryotes.
3. Ribosomes are made up of phospholipids and oligosaccharides.
4. Ribosomes are not found in protista and monera.

Q. Which of the following statement(s) is/are correct?.
i) Ribosomes are called ‘protein factories’ of the cell.
ii) Ribosomes consist of three different proteins.
iii) During translation, the ribosome contains only one of the two subunits.

Read the passage and answer the following question.

Ribosomes are the smallest cell organelles which can be seen only through an electron microscope. They are found in both prokaryotic as well as eukaryotic cells. Ribosomes are dense, round bodies which occur freely in the cytoplasm and may remain attached to the surface of the endoplasmic reticulum. Chemically, ribosomes are made up of ribonucleoprotein (in eukaryotic cells, the constituent of the ribosome is 40% protein and 60% ribosomal RNA). Ribosomes help in the process of protein synthesis. They are, therefore, called as the protein factories of the cell.

Ribosomes are found in

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