New techniques to produce cells with the characteristics of embryonic stem cells include Parthenogenesis, retroviral transduction of transcription factor genes into adult skin cells (iPS), and somatic cell nuclear transfer (SCNT).
<h3>What is
embryonic stem cells?</h3>
- Pluripotent stem cells called embryonic stem cells are produced from the inner cell mass of a blastocyst, a preimplantation embryo in its early stages.
- Four to five days after fertilization, human embryos reach the blastocyst stage, consisting of 50 to 150 cells.
- Embryonic stem cells (ESCs) are stem cells that come from an embryo's core mass of undifferentiated cells.
- In laboratories, typically fertility clinics, 4- to 6-day-old embryos are used to produce human embryonic stem cells.
- The core embryonic cells are taken out and put in a dish with the nutrients they require to thrive.
- Theoretically, embryonic stem cells are capable of mass-producing any kind of tissue.
- These cells are used by researchers to investigate disease and development in the hopes of developing therapies.
- A single embryo's two or three dozen cells can produce millions of embryonic stem cells in about six months.
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The correct answer is graft the scion onto a good rootstock
Answer:
Anatomy.
Because Anatomy is the study of internal body organs
The natural process by which the ozone layer get depleted are sun spots and atmospheric winds. The volcanic eruptions are also responsible for the depletion of the ozone layer.
The thinning of the ozone layer, which is present in the upper atmosphere is called ozone layer depletion. These natural processes causes and some chemicals compounds releases chlorine and bromine, which in exposure of high ultraviolet light causes the depletion of ozone.
The ozone layer found in the stratosphere of the earth atmosphere. This region protects the earth from harmful ultraviolet radiation of the sun. It has potential to absorb around 99% of the harmful ultraviolet radiation.
The main causes of ozone depletion are chloroflorocarbons, carbon tetrachloride, methylbromide. The natural processes does not cause more that 1 to 2 % of the ozone depletion.
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Answer:
it allows only some materials to pass through and leave the cell.
