参考答案:
The steroid hormone diffuses across the membrane of the cell.
The hormone (signalling chemical) binds to the receptor (protein)
The hormone is a ligand as it binds reversibly to the protein receptor.
The receptor is in the cytoplasm of the cell.
The activated receptor (hormone-receptor complex) enters the nucleus.
The activated receptor binds to DNA and causes expression of genes.
The genes that are expressed producing proteins that cause a change in cell function.
Examples (max 2 marks for examples)
Testosterone causes the development of male primary and secondary sexual characteristics.
Oestradiol causes endometrium growth/causes the hypothalamus to secrete gonadotrophin-releasing hormone.
Progesterone stimulates the maintenance of the endometrium (during pregnancy).
本题详细解析:
暂无
