Final answer:
The binding of an estrogen molecule to its receptor in a cell nucleus causes an allosteric change in the receptor's shape, resulting in receptor activation and modulation of gene expression. The option (B) is correct.
Step-by-step explanation:
When an estrogen molecule enters a cell and passes into the nucleus, it binds to its receptor, causing the shape of the receptor to change, leading to activation. This alteration in shape is an example of an allosteric change, which allows the receptor-hormone complex to act as a transcription regulator, thereby increasing or decreasing the synthesis of mRNA molecules of specific genes.
Hormone-receptor binding can result in direct changes by modulating gene expression through the activation of intracellular hormone receptors, or indirectly by initiating signaling pathways via cell surface receptors. This can induce a wide range of cellular responses, including the production of proteins and enzymes, altered membrane permeability, and changes in metabolic pathways. Therefore, option (B) is correct.
This question is not complete, Here I am attaching the complete question:
When an estrogen molecule enters a cell and passes into the nucleus, it binds to its receptor. That causes the shape of the receptor to.
A. Change, leading to activation.
B. Dissolve, releasing the estrogen.
C. Multiply, enhancing cellular responses.
D. Stay the same, preventing any impact.