Answer: I believe it is D, the Nervous System.
Explanation:
Answer:
it is a prokaryotic plant cell, bc of the cell wall.
Explanation:
Answer:
Following are the correctly rank steps:
1. The binding of glucose takes place with the transporter on one side of the membrane.
2. The binding of glucose leads to a conformational change, which opens the site of binding on the contrary side of the membrane.
3. The dissociation of glucose takes place.
4. The transporter moves back to the beginning conformation.
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>
