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A; Viruses are not an exception to all t...

A; Viruses are not an exception to all theory
R: viruses are acellular and have no cell machinery

A

If both As and R are correct and R is correct explanation of As

B

If both As and R are correct but R is not correct explanation of As

C

If As is correct, R is wrong

D

If both As and R are wrong.

Text Solution

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The correct Answer is:
D
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In exception to cell theory is :

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Read the following statements and select the correct option w.r.t cell theory. (i) All living organisms are composed of cells and products of cells. (ii) Viruses are exception to cell theory because they are cellular particles. (iii) All cells arise from pre-existing cells. (iv) Activities of an organisms are the outcome of sum total of activities and interactions of its constituent cells. (v) Rudolf Virchow gave final shape to cell theory.

[A] : Viruses are exception to cell theory . [R] : Viruses don't have a defined nucleus and cytoplasm .

Most of the viruses are/have

[A] : Viruses are not considered organisms . [R] : Viruses lack cytoplasm and metabolic machinery .

DINESH PUBLICATION ENGLISH-ENVIRONMENTAL ISSUES-Assertion and reason
  1. A A cell with actively dividing nucleus is called interphase cell. R...

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  2. A: Mitosis is a equational division . R:During mitosis the number of...

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  3. A; Viruses are not an exception to all theory R: viruses are acellul...

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  4. $ Cellular totipotency means that single cell can give rise to a fully...

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  5. A Flow of genetic information is through the DNA of the nucleus . R...

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  6. As :Endoplasmic reticulum also acts as the cell-skelton. R:Flagellum...

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  7. As: Acetabularia is the largest sized single celled green algae. R P...

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  8. $ Cyanobacterial cells are eukaryotic ! Prokaryotic cells are diplo...

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  9. $ Protoplasm is the physical basis of a cell. ! Angstrom is a unit ...

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  10. A: All the living and non living matter is formed of molecules. R: ...

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  11. $ Minerals such as carbonates and phosphates acts as buffers. ! Biom...

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  12. A: ATP is a type of coenzyme. R: Adenine is a type of pyrimidine.

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  13. $ Ergosterol is a lipid that changes to vitamins D on activation by UV...

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  14. $ Minerals from 25 to 30% of the cell contents. ! Lipids form 40 to ...

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  15. $ Proteins, polysaccharides and nucleic acid are the macromolecules of...

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  16. Length of one turn of DNA is

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  17. $ The two strands of DNA run in an antiparallel directions DNA is fo...

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  18. $ The process of formation of polysaccharides by condensation of monom...

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  19. Assumption: Agar-agar is a carbohydrate obtained from some sea weeds. ...

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  20. A: In conjugated proteins, the protein molecule is joined to a non pr...

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