Multiple choice

Puffs in the salivary gland chromosomes are the sites of

  1. RNA synthesis

  2. DNA duplication

  3. DNA synthesis and destruction

  4. Protein synthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Puffs in polytene chromosomes (such as those found in salivary gland chromosomes of Drosophila) are sites of active RNA synthesis, specifically transcriptional activity. These puffs represent regions where the chromatin has decondensed to allow gene expression. They are not sites of DNA duplication or protein synthesis - those processes occur elsewhere in the cell cycle.

Keep practicing — related questions