A) Ribosomes and rRNA
B) Only rRNA
C) Peroxisomes
D) Several ribosomes held together by string of mRNA
Correct Answer: D
Solution :
Potyribosomes or Polysomes: When many ribosomes (generally 6-8) are attached at some mRNA strand. It is called polysome. The distance between adjacent ribosomes is of 90 nucleotides. These are functional unit of protein synthesis. Hence, the correct option is (d).
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