A radioactive element is an element which is subject to spontaneous degeneration of its nucleus followed by the emission of alpha, beta and gamma particles. All elements with atomic numbers greater than 83 are radioactive.
The given phrases that describe radioactive elements are-
They have a consistent number of particles
- the particles are alpha, beta and gamma particles.
They have a half-life that determines their rate of decay.
Explanation for other options:
Not all elements occur in nature. Radioactive decay rates may not be constant as the decay happens when a radioactive substance emits a particle. It is not possible to predict exactly when a given atom of a substance will emit a particular particle. When the radioactive element release energy and particles, it decays.
Answer:
The correct answer is option (b) "addition of a drug that prevents the α subunit from exchanging GDP for GTP".
Explanation:
The G protein is a name given to a family of proteins that act as a switch in diverse cellular processes, transmitting signals from outside to inside of the cells. When a G protein receptor is activated by a neurotransmitter such as dopamine, the alpha subunit exchanges its GDP for a GTP and disassociates G-protein itself. An addition of a drug that prevents this action would prevent G protein disassociation, which would enhance the effect of stimulating G protein that acetylcholine does.
<span>Stem cells. There are two types of stem cells: adult stem cells - these are unspecialised cells that can develop into many (but not all) types of cells. Embryonic stem cells - these are unspecialised cells that can develop into any type of cell. And that's all! ;)
Hope this is useful !!!^_~!!!</span>
The correct answer to this question is letter B.its ability to form endospores in harsh conditions
The bacterium Bacillus anthracis, which causes anthrax, has been developed as a biological warfare agent. The ability that could have led to this is that its ability to form endospores in harsh conditions
Anthrax usually form endospores in non-bacteria friendly environments, meaning they could get into places that would otherwise be hygienic and infect individuals.
Answer:
Stem cell therapy is a non-invasive treatment that aims to replace damaged cells within the body. Mesenchymal stem cell therapy can be deployed systemically via IV or injected locally to target specific sites, depending on patient needs.
Explanation:
Stem cell therapy is a form of regenerative medicine designed to repair damaged cells within the body by reducing inflammation and modulating the immune system. This phenomenon makes stem cell therapy a viable treatment option for a variety of medical conditions. Stem cell therapies have been used to treat autoimmune, inflammatory, neurological, orthopedic conditions and traumatic injuries with studies conducted on use for Crohn's disease, Multiple Sclerosis, Lupus, COPD, Parkinson's, ALS, Stroke recovery and more.
