The most important characteristic of DNA replication is the DNA to FOLLOW THE BASE-PAIRING RULES.
Answer:
A. A tropical rainforest
Explanation: Because its a nice climate and that will make homes for many diffrent kinds of spicies that can survive in that type of environment.
Answer:
Thyrocalcitonin or TCT
Explanation:
Thyrocalcitonin or TCT is a non-iodinated calcium lowering hormone. It is originating from the parafollicular cells or C cells (C for calcium).
The thyroid gland consists of follicles of cuboidal epithelial cells. These cuboidal cells have a nucleus at the base. These are principal cells responsible for the synthesis of thyroid hormones.
In between these follicular cells, other high cuboidal cells are present, known as parafollicular cells / C cells. These cells synthesise the hormone TCT. When there is high levels of calcium ions in the serum, TCT will release. This lowers the high level of calcium ions in the blood and plasma to normal level. This is done due to the deposition of calcium in the bone.
The presence of dense microvilli in the epithelial cells of the proximal convoluted tubule enhances their ability to reabsorb substances from the filtrate. This structure is also called brush border epithelium.
<h3>What is tubular reabsorption?</h3>
The movement of water and solutes from the proximal convoluted tubule back into the bloodstream is called tubular reabsorption.
Water and solutes from the proximal convoluted tubule (PCT) are transported to the bloodstream in bulk and thus most of the reabsorption occurs via the PCT.
These tubules reabsorb about 60% of water and 90% of bicarbonate. They also reabsorb almost 100% of the glucose and amino acids.
This reabsorption takes place by two routes. First is the paracellular route in which solutes move between cells via the intracellular route. Second is the transcellular route in which solutes move through the cells.
Therefore, the structural modification helping the proximal convoluted tubule cells to enhance their ability to reabsorb substances from filtrate is the presence of microvilli.
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