Answer:
The suitable option will be - A.
A. lactose levels are high and glucose levels are low
Explanation:
It is a operon that is regulated by a set of genes and is regulated altogether and is transcribed into a single RNA in the presence of lactose.
- It is mainly found in E.coli. Lac operon is mainly used for lactose metabolism. There are 3 genes in this system - lacZ, lacY, and lacA.
- LacZ codes for β-galactosidase which cleaves lactose into glucose and galactose. LacY codes for Beta-galactoside permease, which helps in the entry of lactose in the cell. LacA codes for Galactoside acetyltransferase.
It is present in plant cells but not in animal cells
Answer: option B.
The nervous system signals the endocrine system to release
hormones in response to a stimulus.
Explanation:
The nervous system respond to stimulus through action potentials and neurotransmitters and they signals the endocrine system to secrete hormones.
The endocrine system is responsible for secreting hormones into the blood which is transported to the target cells. These hormones are responsible for metabolism , growth and response to stress. The hormones secreted provide feedback to the brain so as to affect neural processing.
That answer would be D.
Hope that helped :)
Various organelles are present because the liver cell has many functions.
