Answer:
up-regulation
Explanation:
Upregulation is where a increases the quantity of a cellular component like protein or RNA in response to an external stimulus.By controlling the number of its receptors, cells may increase and decrease their cell sensitivity.... Hormones can also trigger cells to control themselves by upregulation.( Estrogen is the primary sex hormone for females).
Answer:
The correct answer is option - d. Production of primary spermatocytes.
Explanation:
The accessory cells or supporting cells present within the seminiferous tubules of reproductive system termed as the Sertoli cells. They play various roles in the body and reproductive system.
Sertoli cells make blood-testis barrier in adjacent Sertoli cells in the seminiferous tubules. These cells secrete different types of enzymes and hormones such as inhibin which are also secreted by ovary and placenta in females. Sertoli cells produce seminiferous tubular fluid to provide nutrition to the sperm. Apoptotic germ cells are timely eliminated by these cells.
Thus, the correct answer is option D. Production of primary spermatocytes.
2,500 is correct in my opinion
Answer:
b.yeast,mushroom,bread mould
<span>the alleles that control which blood group antigens appear on the suface of red blood cells are codominant.</span>
