A fish breathes by taking water into its mouth and forcing it out through the gills.
As the oceans simultaneously warm, acidify and increase in PCO2<span>, prospects for marine biota are of concern. Calcifying species may find it difficult to produce their skeleton because ocean acidification decreases calcium carbonate saturation and accompanying hypercapnia suppresses metabolism. However, this may be buffered by enhanced growth and metabolism due to warming.</span>
Answer:
<h2>Yes, the synthesis of threonine occurs because threonine will not be bound to the repressor, so in unbound state, the repressor will be inactive.
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Explanation:
1. If an E. coli bacterium is grown, in an environment where threonine is absent, transcription of threonine synthesis genes take place, because threonine will not be bound to the repressor, so the repressor will be inactive.
2. When the repressor is bound to the threonine, it becomes active, and in the absence of threonine , repressor become inactive because there is no threonine to bind with repressor.
3. So, in the absence of threonine , there is synthesis of threonine occurs.
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