Which of the following options are not a function of ribosomes?
(i) It helps in the manufacture of protein molecules.
(ii) It helps in the manufacture of enzymes.
(iii) It helps in the manufacture of hormones.
(iv) It helps in the manufacture of starch molecules.
A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
D. (iv) and (i)

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Detailed Solution

Ribosomes are small, rounded macromolecular particles found free in the cytoplasm or bound to the endoplasmic reticulum (forming rough ER). Each ribosome has two subunits—one large and one small composed of ribosomal RNA (rRNA) and ribosomal proteins. They occur as 70S ribosomes in prokaryotes and 80S ribosomes in eukaryotes.

Function:

After transcription produces mRNA, ribosomes read codons on the mRNA and join amino acids—delivered by tRNA via anticodon pairing—into a polypeptide chain, thereby synthesizing proteins.

Hence, the correct option is C.

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