A. results from two eggs fertilized by two sperms
Low-Density
Lipoproteins (LDL) is broken down to
protein and free cholesterol. Used for maintaining cell membrane or
synthesizing special compounds (estrogen,
testosterone, vitamin). Oxidized LDL in the blood is picked up by the
Scavenger pathway for Cholesterol Uptake. The <span>WBC sense oxidized LDL, digest and overcome it which avoids it from
re-entering the blood stream which able to pick up vast amounts of LDL.</span>
Answer:
C. Systems are made up of cells
Explanation:
Thousands of cells make tissues and Thousands of tissues makes organ and several organs together form a system so option C can be the answer.
<u>Rest </u><u>options</u><u> are wrong so </u><u>C</u><u> can be the answer</u><u>.</u>
Insulin is a protein hormone secreted by the β-cells of islets of Langerhans in the pancreas. It has an important effect on the metabolism of carbohydrates, lipids and proteins by promoting the absorption of glucose present in the blood by fat cells, liver cells and those of skeletal muscles.
Insulins reduce blood sugar by a double action:
- by stimulating the peripheral uptake of glucose, in particular by skeletal muscle (by promoting the synthesis of glucogen) and adipose tissue (by promoting the synthesis of lipids).
- by inhibiting the hepatic production of glucose. This shows that the action of insulin on the hepatocytes is different from that of other cells.
To explain these differences, we must address notions of genetics, and more specifically epigenetics: All these cells have the same genome (identical DNA), but the expression of the latter in the different cells are very different. For example, for adipocytes, the expression of the enzymes involved in lipogenesis is favored, whereas the expression of the enzymes of glucogenogenesis is favored in the muscle cells, and in the liver there is a genetic overexpression of the enzymes of neoglucogenesis.
When an organism is sessile, or slow moving it might be very hard for that organism to find food, shelter and a reproductive mate.
One of many solutions to the problem of finding a mate is hermaphroditism.
When an organism is hermaphroditic it means that it has the reproductive organs of both sexes and that it is able to self-fertilize.
This solution, although sometimes very useful, if used all the time can lead to inbreeding and have negative effects on the genetic diversity of the population. Therefore, hermaphroditic organisms self-fertilize only in cases where there is no available mate to be found.