Advantages:
>No cables needed.
>Multiple channels available.
>Wide bandwidth.
Disadvantages:
>Line-of-sight will be disrupted if any obstacle, such as new buildings, are in the way.
>Signal absorption by the atmosphere. Microwaves suffer from attenuation due to atmospheric conditions.
>Towers are expensive to build.
Answer:
C. Diabetics will have ample supplies of insulin that are produced by bacteria.
Explanation:
The technology of recombinant DNA has allowed scientists to introduce the human insulin gene into E.coli bacteria. E. coli are thus turned into "biological factories" that produce large quantities of human insulin, which can be easily purified and used as medicine for diabetics.
There are many more examples of DNA recombinant technology in human medicine, such as the production of recombinant human growth hormone (hGH) also in E. coli that is injected in individuals who don't produce enough hGH naturally, or even the production of vaccines by inserting antigen-coding DNA into a cell, purifying it and later injecting it into individuals to stimulate immunization.
Answer:
The correct answer is - A. phototropic and gravitropic.
Explanation:
A plant seedling grows usually two-direction shoots or stems towards light and roots towards the soil or in the direction of gravity. The movement of the plant toward a specific stimulus or effect parts is called tropism and different parts move in a different direction.
The movement of the roots of the plant is usually towards the direction of soil or gravity and this is called gravitropic. The shoot or stem grows from the seedling towards the direction of light and it is called phototropic.
Biologists think that endosymbiosis gave rise to mitochondria before plastids partly because: (All eukaryotes have mitochondria whereas many eukaryotes do not have plastids)
Answer:
Pleurisy
Explanation:
Pleurisy is a medical condition caused by the inflammation of the pleura membranes. The pleural membranes are vital part of the respiratory system. These membranes which surround the lungs and lines the inner chest wall, help to give cushion and reduce friction in the lungs. When the pleural membranes become inflamed, the surfaces become tough and sticky, thereby causing the sharp pain the person feels in the chest while breathing.
