MCQ
Which of the following is a nucleoside?
- AAdenosine
- BAdenine
- CDeoxyribose
- DAdenylic acid
Explanation:
A nucleoside has a nitrogenous base and a 5-carbon sugar joined via a $\beta$-glycosidic linkage. nucleoside of DNA has deoxyribose sugar wheras that of RNA has ribose sugar. On the basis of different bases, there are five types of nucleoside; cytidine, uridine, adenosine, guanosine, thymidine. When a phosphate group is covalently linked at the 5' hydroxyl of adenosine, it is called as adenylic acid which is a nucelotide. Adenine is a purine base, found in both DNA and RNA, base pairs with thymine via two hydrogen bonds. Deoxyribose is a pentose sugar present in DNA.
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$I.$ Natural selection is essential for evolution
$II.$ Natural selection do not include variations
$III.$ Concept of natural selection was given by Hugo de Vries
$IV.$ Mutation is the sudden inheritable change
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