The human immunodeficiency virus (HIV) that causes the disease known as aids selectively infects helper T cells (CD4+).
This retrovirus also infects macrophages and dendritic cells. When CD4+ T cell numbers decrease below a critical level (due to the killing of this cells with different mechanisms), cell-mediated immunity is lost. As a result, the body becomes progressively more susceptible to infections, leading to the development of AIDS.
<span> HIV can be transmitted only via body fluids like blood, semen, pre-seminal fluid, rectal fluids, vaginal fluids, and breast milk, which means that people usually get or transmit HIV through sexual behaviours and use of the needle. For HIV infection, these fluids must come in direct contact with a mucous membrane or damaged tissue. Another way is to be directly injected into the bloodstream (from a needle for example).</span>
Organic compounds are used as building blocks for. Answer : Organic compounds are compounds that contain Carbon, C and contain Hydrogen, H as well. ... This leaves us with choice 4, indeed, proteins, starches and fats are organic compounds.
The given statement is True.
<u>Explanation:</u>
The Charles Darwin developed the theory called Darwinism theory of evolution. The theory states that all the species of the organisms arises and developed through the small, inherited variations in the organisms that increase the individual ability to complete the survive and reproduce.
The individual species are not having identical traits that are passed from the generation to generation. The offspring are born that can survive, only the survive of the completion for resources will reproduce; he describes how the species can change in shape and character through the selective breeding.
Answer:
chemical reaction that involves the transfer of an electron is classified is an oxidation and reduction reaction oxidation is the process of losing an electrons while reduction is a process of gaining them. any chemical that cause another chemical to use electrons oxidized is called an oxidizing agent
Answer:
the well be wind cell are used in isolated locations
