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Ribosomes of Prokaryotic Cell

Ribosomes of ...

Question

Ribosomes of the cytoplasm, chloroplast and mitochondrion are respectively

A

80S, 80S and 70S

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B

80S, 70S and 70S

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C

70S in all

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D

80S in all

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Solution

The correct option is C 80S, 70S and 70S
Ribosomes are the granular structures composed of RNA and proteins. The eukaryotic ribosomes are 80S while the prokaryotic ribosomes are 70S . The cytoplasmic ribosomes are 80S whereas the ribosomes of chloroplast are smaller i.e.; 70S. Mitochondria is a prokaryotic one containing 70S ribosomes. The 'S' is a Svedberg unit stands for the sedimentation coefficient . It indirectly measures the density and size.
So, the correct option is 'Option B' .

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Similar questions

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 is correct option amongst the following statements?
(a) Nuclear membrane, chloroplast, mitochondria, microtubules and pili are absent in prokaryotic cells.
(b) Nuclear membrane, chloroplast, mitochondria, microtubules and pili are present in eukaryotic cells
(c) Ribosomes are 70S in prokaryotic cells and mitochondria. They are 80 S in animal cells.

Q. Read the following statements and identify the correct option given.

I. In prokaryotic cell, the nuclear membrane, chloroplast, mitochondria, microtubules, and different kinds of pili are absent.
II. In eukaryotic cell, the nuclear membrane, chloroplast, mitochondria, and pili are present.
III. In a prokaryotic cell, the ribosome is of 70S type and in mitochondria of eukaryotic animal cell, the ribosome is 80S type.

Q. How many statements are correct regarding plastids?

(A) Plastids are found in all plant cells and in euglenoids.
(B) Based on the type of pigments plastids can be classified into chloroplasts, chromoplast, and leucoplasts.
(C) In the chromoplasts fat-soluble carotenoid pigments like carotene, xanthophylls, and others are present.
(D) The ribosomes of the chloroplasts are larger than the cytoplasmic ribosomes.
(E) Leucoplasts are the colorless plastids which store nutrients.

Q. Read the given statements A & B and choose the correct option.
A. The ribosomes of the chloroplasts are smaller than the cytoplasmic ribosomes.
B. Chloroplasts can synthesise some of their proteins but they receive other proteins from cytoplasm.

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