The stringent response a.ensures that the cell has a large number of ribosomes for translation. b.occurs in response to sugars o
ther than glucose and ensures that the cell only transcribes catabolic operons when the appropriate sugar (such as lactose) is present. c.is a form of catabolite repression. d.occurs in response to low energy stores.
The stringent response occurs in response to low energy store
For example when there is low level of lactose it means energy level is low so there will be no transcription of genes and hence transportation and catabolism of lactose will be inhibited
When E coli is grown in mixture of both glucose and lactose, at high glucose concentration the growth rate is maximum and lactose catabolism is repressed, this called as catabolite repression and it is due to level of cAMP
The electron transport chain (ETC) is the final step of cellular respiration and takes place in the mitochondrion.
The final step in cellular respiration is the electron transport chain. This is sometimes abbreviated as ETC. ETC needs oxygen, which means aerobic process. It occurs at the edges of the inner lining of mitochondria. These handles are called cristae.
