Answer:
B -the absence of the inducer, but not in its presence
Explanation:
In positive repressible regulalor mechanisms transcription of the structural gene(s) occurs in the absence of the inducer because proteins are normally bound to the pertinent DNA segment. when an inhibitor is bound by the inducer, it is prevented from binding the DNA. which will the stops the activation and transcription of the structural genes.
Example of positive repressible regulator is Activator .
Regulating the rate of transcription is a mechanism of gene regulation leading to the productionn of more than one protein product from a single gene.
Which question is it there are multiple ???
Both growth and development are changes in a particular organism within different aspects. “Growth” means “an increase in size and mass of an organism over a period of time” - “development” is a broader subject.
Answer:
The given blank can be filled with zygotic mortality.
Explanation:
An array of mechanisms, physiological procedures, and behaviors, which inhibit two distinct species that mate from generating offspring, or which makes sure that any produced offspring is not fertile. It can be either prezygotic, that is, obstructions that inhibit fertilization or postzygotic, that is, the obstructions, which take place after the formation of zygote.
A kind of obstruction known as the zygotic mortality in which the sperm and egg come into contact with each other and fuse, however, the zygote dies due to the absence of further development. It is one of the forms of post-zygotic barriers.
melatonin is a hormone secreted by the pineal gland and its main function is to regulate sleep rhythm (circadian rhythm)
