Which of the following is not found in rna

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17. Which of the following is not found in RNA a. Adenine b. Thymine C. Cytosine d. Uracil 18. A plasmid is a. Non-chromosoma


Answer: 17. (b) Thymine is not present in RNA. RNA is very much similar as DNA but in case of RNA is single stranded structure with ribose sugar and in ribose sugar use of uracil instead of Thymine which is present in deoxyribose sugar present in DNA. In RNA uracil is present which maintain the structure but lifespan is very low compared to the thymine. 18. (d) A plasmid is chromosomal eukaryotic DNA This answer is partially correct because most of the plasmid is prokaryotic. Because plasmids are double stranded DNA molecules present in bacteria and bacteria is prokaryotic in nature. 19. (c)TAACCGG– is compliment of DNA sequence. Because DNA always present in double stranded form first strand is leading strand and other is lagging strand when two differ stand cross each other make a fragment is known as Okazaki fragment. Base pairs compliment according to the their size (1 :1) which is defined by Austrian chemist Erwin Chargaff.

And in modern recombinant DNA technology is known as Chargaff’s rule.

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