_____ are the centre of protein synthesis.
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Ribosomes
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Chromosomes
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Chloroplasts
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Cellulose
A
Correct answer
Explanation
Ribosomes are cellular organelles responsible for protein synthesis. They read messenger RNA (mRNA) and assemble amino acids into polypeptide chains according to the genetic code. Chloroplasts are for photosynthesis, chromosomes contain DNA, and cellulose is a structural polysaccharide in plant cell walls.