Answer:
The correct answer will be option-
1. UV light strikes the skin and converts a steroid molecule into an inactive form of vitamin D.
2. Inactive vitamin D is transported to the liver where it is modified.
3. Vitamin D is activated under the influence of PTH.
4. Inactive, chemically altered vitamin D is transported to the kidneys.
Explanation:
Vitamin D is a fat-soluble metabolite which helps maintain the health of the bone by maintaining the calcium homeostasis.
The vitamin D is synthesized mainly in the liver and kidney from the biologically inactive precursor of vitamin D called ergocalciferol and Cholecalciferol.
The inactive vitamin is synthesized in the skin when the skin is exposed to UV rays. The UV rays convert the 7-dehydrocholesterol, a steroid molecule to Vitamin D3, This inactive vitamin is then transported to the liver where it is converted to 25-hydroxyvitamin D.
This vitamin D form is further metabolized in the kidney controlled and regulated by the Parathyroid glands.
Answer:
In an interval of 5 minutes, ER has ribosomes attached to it which makes proteins synthesizing in the lumen of the endoplasmic reticulum incorporates proteins in the small transport vesicles.
These vesicles transport and fused to the Golgi bodies where proteins modified which can be seen in 15 minutes in the figure. Then modified proteins are transported from the cell cytosol with the help of secretory vesicle to the extracellular matrix and to the required organs.
The correct answer is Glycogen is the body’s main source of energy, but lipids contain most of the body’s stored energy.
The glycogen is a polymer of the glucose. The carbohydrates are the main source of the energy in our body. The glucose that is left after the normal energy utilisation by the body is converted into the glycogen and stored at various location, but the most of the energy reserves of our body lies in the fats, which is stored in form of lipids.
Answer:
The tectonic plates comprise the bottom of the crust And the top of Earth's mantle.
