Question

which of these elements is needed in addition to carbon, hydrogen and oxygen to make proteins
a. nitrogen
b. phosphorus
c. potassium
d. calcium​

Answer 1

Answer:

Nitrogen is needed in addition to carbon,hydrogen and oxygen

Explanation: because the proteins are made up of nitrogen,carbon,hydrogen etc to make up amino acid

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Answer 2

Nitrogen is needed in addition to carbon, hydrogen and oxygen.

Explanation :

$\bigstar\;\underline{\underline{\bf Protein :}}}}$

The bio macro-molecules consisting of smaller repeating units known as amino acids. The proteins are made up of many different kinds of amino acids, have with carbon, hydrogen, oxygen, and nitrogen, the elements sulfur and selenium .

Therefore, The parts/pieces of any amino acids used to make proteins.

In amino acids, there is the presence of NH2, consisting of nitrogen atoms in the structure.

Now, According to the given options,

Calcium, Potassium, and phosphorus are not needed to make amino acids.

Hence,

Nitrogen is needed in addition to carbon, hydrogen, and oxygen.