In which component is a heterocyclic ring found?

  • A
    Nitrogenous base
  • B
    Cyclic structure of monosaccharide
  • C
    Protein
  • D
    Both $(A)$ and $(B)$

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$99 \%$ of living systems are made up of four elements:

Complete the following analogy-type questions:
$(i)$ Purine : Guanine :: Pyrimidine : .........
$(ii)$ Hexokinase : Transferase :: Amylase : .........

Where are hydrogen bonds important to life?

Which of the following pairs is correctly matched?

Match the following:
Column $I$ Column $II$
$(a)$ Aquaporin $(i)$ Amide
$(b)$ Asparagine $(ii)$ Polysaccharide
$(c)$ Abscisic acid $(iii)$ Polypeptide
$(d)$ Chitin $(iv)$ Carotenoids

Select the correct option:

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