Read the following statement and identify the correct option given.
A. In prokaryotic cell, the nuclear membrane, chloroplast, mitochondria, microtubules and different kinds of pili are absent.
B. In eukaryotic cell, the nuclear membrane, chloroplast, mitochondria, microtubules and pili are present.
C. In prokaryotic cell, the ribosome is of 70S type and in mitochondria of eukaryotic animals cell, the ribosome is of 55S type.

A and B are wrong and C is correct.

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A is correct and B and C are wrong.

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A and B are correct and C is wrong.

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A and C are correct and B is wrong.

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All the options are wrong.

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Solution

The correct option is A A and B are wrong and C is correct.
A pilus (pili) is a hair-like appendage found on the surface of many bacteria for attachment to the surface and also as an appendage required for bacterial conjugation. All pili are primarily composed of oligomeric pilin proteins.
Ribosomes are naked ribonucleoprotein particles. The eukaryotic ribosomes have a sedimentation coefficient 80S while prokaryotes have 70S type of ribosomes. The ribosomes found in mitochondria of eukaryotes are of 70S type. The membrane-bound cell organelles like nucleus, chloroplast and mitochondria as well as cytoskeletal structures are absent in prokaryotic cell.

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Similar questions

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. 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. Which of these statements is/are true?

(i) The surface area available for cellular functions in a prokaryotic cell is less than that in a eukaryotic cell.
(ii) The total genome size of a prokaryotic cell is always less than that of a eukaryotic cell.
(iii) Unlike eukaryotes, no special respiratory organelles are found in prokaryotes. Hence they respire at a much less rate than eukaryotes.
(iv) Eukaryotic cells show various membrane-bound organelles such as chloroplasts and nucleus while ribosomes are the only membrane-bound organelles found in prokaryotes.

Statement 1: Nuclear membrane and the endoplasmic reticulum were originally formed from the invaginations of the cell membrane.
Statement 2: Mitochondria and chloroplast are the results of a symbiotic association of bacteria with primitive pre-eukaryotic cells.

Q. Mark the following statements 'true' or false. Rewrite the wrong ones correctly.
(a) All cells have nuclei.
(b) Chloroplasts are present in all plant cells.
(c) Animal cells usually do not have vacuoles.
(d) Animal and plant cells have cell membranes.
(e) Ribosomes are called 'suicide bags'.
(f) The cell wall is made of cellulose which is a living substance.
(g) The cell membrane is freely permeable to all substances.
(h) All living organisms are made up of cells.
(i) Structures present in the cell are called organs.
(j) Cell respiration takes place in mitochondria.

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