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Standard IX
Biology
Bacterial Disease
Which of the ...
Question

Which of the following statements is incorrect regarding the structure of a typical bacterial cell?

A
Cells possess naked circular DNA which is folded to form nucleoid.
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B
Cells are surrounded by a peptidoglycan cell wall and a mucilaginous sheath.
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C
Cells possess well developed membrane bound cell organelles.
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D
Ribosomes in these cells are 70S in nature.
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Solution

The correct option is C Cells possess well developed membrane bound cell organelles.
The bacterial cell is a prokaryotic type of cell which lacks membrane-bound cell organelles.
So, the correct option is 'Cells possess well-developed membrane-bound cell organelles.'

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Q.

Question 10

Which of the following is not true of a eukaryotic cell?

(a) Cell wall is made up of peptidoglycans

(b) It has 80S type of ribosome present in the cytoplasm.

(c) Mitochondria contain circular DNA.

(d) Membrane bound organelles are present

Q.

Which of the following is correct:

(a) Cells of all living organisms have a nucleus.

(b) Both animal and plant cells have a well defined cell wall.

(c) In prokaryotes, there are no membrane bound organelles.

(d) Cells are formed de novo from abiotic materials.

Q. You are told that the cells on a microscope slide are a plant, animal or the bacterial cell. You look through a microscope and see cell wall and membrane-bound organelles. you conclude that the cells
Q. Read the following statements regarding archaebacteria.
I. Their cell wall lacks peptidoglycan.
II. They contain membrane bound organelles.
III. These have distinct ribosomal RNA sequence.
IV. Lipid in cell membrane of archaebacteria have different structure than those in all other organisms.
Choose the incorrect option.
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.

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