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natka813 [3]
3 years ago
6

If you irradiated a sick mouse and transplanted in bone marrow from the wild type mouse would you expect this chimeric mouse to

be able to fight viral infections?
Yes / No
Biology
1 answer:
QveST [7]3 years ago
7 0

Answer:No

Explanation:Rather bone marrow transplant will provide new stem cells that can help to kill cancer cells directly.

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Match the reactants and products with the correct HALF of PSN.
murzikaleks [220]

Answer:

B

Explanation:

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3 years ago
1. A scientific law is a statement of fact that describes an action or set of actions. Laws are accepted as fact because they ar
irinina [24]

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A: Newton's Law of Gravity

B: Newton's law states "any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them." Which is true.

Explanation:

Ap3x

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2 years ago
The greenhouse effect plays a major role in the climate of a planet. Visit the Greenhouse Effect AstroTour, and use what you lea
Lesechka [4]

B. If there were no greenhouse effect, liquid water would not exist on the surface of the Earth

D. The Earth has reached thermal equilibrium, emitting the same amount of energy into space as it absorbs from the Sun.

E. The more carbon dioxide there is in an atmosphere, the stronger the greenhouse effect will be

Explanation:

The greenhouse effect plays major role in the climate of our planet in diverse ways:

  • it is responsible for the existence of liquid water on the surface of the earth.
  • it allows the earth to reach an equilibrium with space in exchange of thermal energy.
  • carbon dioxide concentration in the atmosphere has huge roles.

The greenhouse effects results from the abundance of greenhouse gases in the atmosphere. These gases are able to prevent long wave solar radiation from leaving the surface of the earth. When the gases interacts with the radiation, it produces heat that warms the earth surface. Examples of these gases are carbon dioxide, methane, water vapor e.t.c.

The warming of the surface helps to free freshwater trapped as ice and keeps it in the liquid form throughout.

In this exchange of energy, there is a balance between the amount of heat absorbed and radiated back into the atmosphere. As energy enters the earth, it is also radiated out into space. This helps to keep the earth temperature in balance.

Learn more:

Greenhouse emission brainly.com/question/4580761

#learnwithBrainly

7 0
3 years ago
write a paragraph explaining why it is difficult to make drugs or vaccines against HIVgiven the fact that each time reverse tran
Sunny_sXe [5.5K]

Answer:

people who are HIV positive but keep the virus in check. This research stems from the International HIV Controllers Study, and researchers hope that their findings will ultimately help inform the development of new therapies and vaccines. Over the last 30 years, scientists have discovered lots of tantalizing clues about the virus, our immune system, and the interplay between the two, but a vaccine remains elusive.

Since the epidemic emerged, 25 million people have died from AIDS and 60 million have been infected with HIV, according to the Joint United Nations Programme on HIV/AIDS. AIDS was detected in California and New York in 1981, first among gay men and drug users, then in hemophiliacs who had received blood transfusions, and later in non-drug-using men, women, and children

Initially, little was known about how AIDS was transmitted, and even less was known about the virus that caused it. In 1985, the virus itself was isolated. Following this discovery, Margaret Heckler, the US Human Services Secretary at that time, famously declared, "We hope to have a vaccine [against AIDS] ready for testing in about two years."

Vaccines have worked well against once widespread diseases like smallpox and polio. After the AIDS virus was found, many people, including many scientists, thought AIDS would be added to the list. Vaccines mimic natural infections, during which the body produces antibodies that kill the virus. But unlike smallpox or polio, HIV doesn’t stimulate this kind of response – our immune systems are generally blind to the virus and unable to launch an effective antibody attack. Other challenges that scientists face as they try to create a vaccine include a lack of good animal models to study and the virus's ability to constantly change and mutate. Additionally, although controllers can keep levels of the virus low, no one has ever fully recovered from HIV infection. This means there's no natural, winning strategy for scientists to study and try to elicit.

Results from previous efforts to build a vaccine have been disappointing. Last year, an HIV vaccine trial in Thailand produced unimpressive results – by some measures, the vaccine reduced the chances of infection by 30 percent at most.

But this summer, scientists discovered three powerful antibodies against HIV and efforts are now underway to transform this discovery into treatment.

In addition to approaches that try to stimulate antibody immunity, researchers are also looking for ways to stimulate cellular immunity, or activate the other weapons in the immune system’s arsenal, like macrophages, natural killer cells, T cells, and more. Alerting the body’s immune system to HIV’s invasion may not prevent infection, but it could inhibit the disease’s progression and keep viral populations so low that there might be less risk of transmission.

One vaccine developed using this approach failed in trials, appearing to even increase some participants' susceptibility to the virus. But knowledge of what happened in that trial may help scientists create a more effective vaccine that targets cellular immunity

By looking at the interaction between the virus and hosts who are able to hold the virus at bay without the help of medicine, researchers hope to learn more about how to fight the virus. New clues from the viral and host genome may help lay a foundation for future means of combating HIV.

Explanation:

4 0
2 years ago
[OU.02] Which of these instruments can be used to gather radiations from distant stars to make them visible to humans?
wariber [46]
The correct option is A.( Lens )
The eye piece is the part of the telescope that one looks through and is the part that makes the focused light visible to the eye. The eye piece is made up of magnifying lenses.
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