Indeed, steroid hormones have an important role in the well-being of the individual through specialized cells (having specific receptors). Take the example of vitamin D.
Vitamin D is involved in calcium and phosphorus absorption by the intestines, as well as in their reabsorption by the kidneys. It is involved also in bone mineralization of the skeleton and joints, as well as on muscle tone.
The mechanism of action of the hormone is identical to the scheme:
Its carrier is vitamin D-binding protein
The cell may be an intestinal cell, bone cells or renal cells.
The vitamin acts on the DNA is activating / inhibiting certain genes encoding proteins so as to increase the level of calcium in blood.
Answer:
a)
Based on the data for the group of cells, among the four proteins, protein p16 does not appear to play a role in blocking cell cycle entry by fibroblasts. The evidence for this is in group 7, where, in the absence of the other proteins the p16 presence has helped the replication of DNA almost as good as the growth in the 10% serum.
In the other groups (3 to 6) the presence of any other protein has always inhibited the DNA replication compared to the fibroblast in 10% serum.
b)
Groups 4 to 7 have higher chance of including cells undergoing mitosis as they are showing more DNA replication compared to the group 1 which has 0% serum. In this group since it has been cultured for 48 hours in the absence of serum (serum-starvation), they stop dividing and enter the G0 stage of the cell cycle.
c)
The data here would provide the crucial information on which protein is required to induce the cells to enter the cell cycle. To recover from an injury the cells should divide and repair the wound, this will happen through stimulating the cell with the required protein. It would also shed light on which protein would inhibit the cells from entry into the cell cycle.
Note: Figure is added in the attachment section
The answer would be a because the jet stream is very cold and come down to the water like a magnet sort of and keeps the top of the water cold so there for you have a cold water current on the top of the water so the answer is )A
Answer:
Recreation ans scenic areas for tourism.
Explanation:
- As the ecosystem provides a certain amount of services as habitat, healthy soil and clean air, freshwater nutrient cycle s and human goods like culture, recreation, and health. All these are benefits that humans freely gain from the natural ecosystem either be agro, forest aquatic or grasslands, etc.