Answer:
Iodine in the food items included in the diet
Explanation:
The thyroid hormones (T3 and T4) are the lipid-soluble hormones and are formed when iodine is attached to the amino acid tyrosine. The triiodothyronine (T3) has three atoms of iodine while tetraiodothyronine (T4) has four atoms of iodine attached to the benzene rings of tyrosine.
Hence, the synthesis of T3 and T4 hormones by thyroid gland depends on the availability of iodine atoms which in turn mostly comes from the diet.
Active transport of iodide ions occurs from the blood into the cytoplasm of the follicular cells of the thyroid gland. In fact, most of the iodide ions are concentrated in the follicular cells of the thyroid gland in the body. Diet serves as a source of iodine and the diet deficient in iodine leads to malfunctioning of the thyroid gland.
Answer:
Explanation:
1- closely packed osteons or haversian systems, used to provide strength and protection to bones.
2- Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow. provides balance to the dense and heavy compact bone by making bones lighter so that muscles can move them more easily.
Answer;
- A batch culture
A closed system, used for bacterial growth, where nothing is added and nothing is removed is called a batch culture.
Explanation;
-Batch culture is a technique used to grow microorganisms or cells. A limited supply of nutrients for growth is provided; when these are used up, or some other factor becomes limiting, the culture declines. Cells, or products that the organisms have made, can then be harvested from the culture.
-In this culture, certain volume of medium is inoculated with cells. The cells grow in the medium and are exposed to changing conditions, as nutrients are depleted and waste products accumulate.
Answer:
Prokaryotic cells are simple cells whereas Eukaryotic cells are large and complex cells.
Explanation:
- There is difference between the prokaryotic cells and eukaryotic cells in its structure and functions.
- Prokaryotic cells lack well defined nucleus but contain DNA molecules called as nucleoid. whereas, Eukaryotic cell contains a well defined nucleus.
- Prokaryotic cell is a single-cell and contains only one chromosome whereas eukaryotic cell is a multicellular which contains many chromosomes.
- Features like growth, response and reproduction is present in both type of cell.
Stewardship is the management and planning of resources while conservation is preserving resources.