Balbiani rings are sites of:
Correct answer: B. RNA and protein synthesis
- A. Polysaccharide synthesis
- B. RNA and protein synthesis
- C. Lipid synthesis
- D. Nucleotide synthesis
Explanation
In certain development stages, the polytene chromosomes bear conspicuous swellings called chromosome puffs. The larger swellings are called Balbiani rings. In the region of a puff or Balbiani ring, the DNA strands uncoil, become active, and produce a number of copies of mRNA. The mRNAs may remain temporarily stored in the puff, and they may undergo transcription to form proteins. Thus, Balbiani rings are the sites of RNA and protein synthesis.
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Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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