1.

Five most abundant elements in the living cell are

Answer»

`C,H,O,N,Fe`
`C,H,O,N,P`
`C,H,N,Mg, Ca `
`C, H, Fe, Mg, Ca`

Solution :`C, H, O, N, P` are the five most abundant elements in the living CELL. C, H, O and N constitute about 95% of the weight of the cell contents. The biological importance of the principle elements is mainly due to their ability to FORM more stable covalent bonds than any other elements with the same valencies. They are found in the found in the form of carbohydrates, `H_2O`, proteins, nucleic acids (DNA/RNA), for life, both as a structural MATERIAL in ANIMALS and plants. About 60% bones and teeth are `Ca_(3)(PO_4)_(2)`.


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