CGPSC Prelims General Studies 2022 Solved Paper 1

Concept:Viruses have genetic material that can be either $\mathrm{DNA}$ or $\mathrm{RNA}$, and their mutation rates differ.Explanation:The term virus was coined by Dutch microbiologist M. W. Beijerinck in $1898$, so statement A is true.A viral genome can be $\mathrm{DNA}$ or $\mathrm{RNA}$ based, so statement B is true.Most $\mathrm{DNA}$ viruses are double-stranded, not single-stranded, so statement C is not true.$\mathrm{RNA}$ viruses lack proofreading and mutate faster than $\mathrm{DNA}$ viruses, so statement D is true.Answer:The statement that is not true is: $\mathrm{DNA}$-based viruses are usually single-stranded.