A Sertoli cell (a kind of sustentacular cell) is a "nurse" cell of the testicles that is part of a seminiferous tubule and helps in the process of spermatogenesis; that is, the production of sperm.
It is activated by follicle-stimulating hormone (FSH) secreted by the adenohypophysis, and has FSH receptor on its membranes. It is specifically located in the convoluted seminiferous tubules (since this is the only place in the testes where the spermatozoa are produced). Development of Sertoli cells is directed by the testis-determining factor protein.
Answer:
Transcription and DNA replication are cellular processes in which chromosomes must be decondensed.
Explanation:
In transcription, the transcription factors need to interact with promoter sequences and for this purpose they require DNA accessibility. Similarly, the DNA replication is another cellular process that also need accessibility for binding DNA polymerases
Answer:
Explanation:
The flowers are the reproductive structure of plants that produce fruits.
When the fruits produced by flowers has fragrance, the smell will attracts animals and even man to pluck and eat it. Once they finished consuming it , it will be disposed anywhere the animals find themselves.
If the fruits has sweet tasting, the animals or man that consumed it at the first time will constantly go to the pants to pluck more fruits because of its good tastes sand this will attract alot of animals or men to pluck more of it and take away, once this is done it is been easily disposed and found all over the place.
Answer:
was introduced during the Renaissance
Explanation:
