Which of the following is a characteristic fe | vedclass

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(D) Viruses exhibit several unique characteristics:$1$. They are obligate parasites that require a living host cell to replicate (self-replicate).$2$.

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All of the above

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(D) Viruses exhibit several unique characteristics:$1$. They are obligate parasites that require a living host cell to replicate (self-replicate).$2$. They are ultramicroscopic,meaning they are smaller than bacteria and can be crystallized,a property typical of non-living matter.$3$. Because they lack independent metabolic machinery but possess genetic material and can evolve,they are considered to be at the threshold or intermediate between living and non-living entities.Therefore,all the given options are correct.

Column $I$	Column $II$
$(a)$ Potato spindle tuber	$(i)$ Virus
$(b)$ Creutzfeldt-Jakob disease $(CJD)$	$(ii)$ Viroid
$(c)$ Cholera	$(iii)$ Prion
$(d)$ Leaf rolling and curling	$(iv)$ Bacteria

Which of the following is a characteristic feature of viruses?

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Prions are primarily composed of ...... .

Assertion $A$: Viroids and viruses can pass through bacteria-proof filters.
Reason $R$: Bacteria are retained by bacteria-proof filters.
Which option is correct for Assertion $A$ and Reason $R$?

Which of the following is an example of a lichen?

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Match the following:
Column $I$ Column $II$
$(a)$ Potato spindle tuber $(i)$ Virus
$(b)$ Creutzfeldt-Jakob disease $(CJD)$ $(ii)$ Viroid
$(c)$ Cholera $(iii)$ Prion
$(d)$ Leaf rolling and curling $(iv)$ Bacteria

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