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about 98 percent of the mass of every li...

about 98 percent of the mass of every living organism is composed of just six element including carbon , hydrogen nitrogen oxygen and :

A

calcium and phosphorus

B

phsophorus and suphur

C

suphur and magnesium

D

magnesium and sodium

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The correct Answer is:
B
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Adenine is a substituted form of a heterocyclic nitrogenous base Purine. Adenine is found in both polymers DNA and RNA . Adenine is composed of the elements carbon, hydrogen and nitrogen and has molecular mass of 13.5 amu . Upon analysis, it was found that the ratio of % (by w.t. ) of carbon to that of total % (by wt ) of hydrgoen and nitrogen was found to be 4:5 respectively. The ratio of number of N atoms to hydrogen atoms is 1 : 1 . Now, answer the following questions: In one molecule of adenine :