<u>Answer</u>:
A scientist is most likely to use a simulation in a controlled experiment in order to observe a 1000-year process in one day.
<u>Explanation:</u>
In scientific observation, its carried out in the control environment so as to minimise the effects of the variables besides those independent variable, which also helps in increasing the accuracy of the results. also frequently through comparison between those control environment and other measurements. Through this process data of 1000 years can be studied in very short period of time. And also getting the accurate details. This is also known to be doing multiple experiments at certain period of time.
Facilitated diffusion is the process of spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins.
The solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. This process is called passive transport or facilitated diffusion, and does not require energy.
hope this helps
Answer:
Scientists from the UCLA AIDS Institute and the Institute for Stem Cell Biology and Medicine have derived T-cells from human embryonic stem cells, raising hopes for a gene therapy to combat AIDS. The Proceedings of the National Academy of Sciences reported the findings in its July 14, 2006, online edition.
“We may be able to use human embryonic stem cells to treat T-cell and other blood diseases,” says lead author Zoran Galic, assistant research biologist. “This could be a very important weapon in the fight against AIDS.”
The researchers cultured human embryonic stem cells and incubated them on mouse bone-marrow cells, which in turn converted them into blood-forming cells. Those cells were injected into a human thymus that had been implanted in a mouse. The thymus transformed the bloodforming cells into the T-cells that HIV targets for destruction.
“Our results indicate that it’s possible to decipher the signals that control embryonic stem cells’ development into mature T-cells,” says Jerome Zack, associate director of the UCLA AIDS Institute and professor of microbiology, immunology and molecular genetics. “This way we can eventually repopulate the immune system of patients needing T-cells.”
One of the body’s main defenses against disease, Tcells are manufactured in the thymus. The organ shrinks as we age, weakening the immune system. The scientists anticipate that their findings could give rise to gene-therapy approaches for other diseases related to T-cells such as severe combined immunodeficiency, or “bubble-boy disease.”
Explanation:
1. Survival of the fittest
2. Natural selection
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