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boyakko [2]
3 years ago
7

Please help with this biology thing

Biology
1 answer:
Keith_Richards [23]3 years ago
8 0

Leeuwenhoek - Advanced microscope

Schleiden - Plants made of cells

Schwann - Animals made of cells

Virchow - New cells from old cells

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3 years ago
How can water intake affect the volume and concentration of urine?
Alchen [17]
More water means more pee (theoretically). Pee is actually just garbage materials from the body (toxins). These color the urine. The more you drink, the more you have to pee and just pee clean because all toxins are out, or you have more water to take out the toxins, having less of it per let's say 0.5 l
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How are the autotrophic protists different from the heterotrophic protists?
zavuch27 [327]
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5 0
3 years ago
Read 2 more answers
two things that can cause cancer include 1) death and miscopying 2) exact copy of heathly DNA and damaging effect of radiation 3
faltersainse [42]

Mutations and Death is the right answer

3 0
2 years ago
What is the basic difference in effector function between helper and cytotoxic T cells?
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Answer:

Helper T cells stimulate B-cells to produce antibodies and killer T cells to destroy the non-self cells. Cytotoxic T cells on the other hand are direct attack cells. They can kill the micro organisms by creating pores on the invader's cell.

Explanation:

T lymphocyte mediated immunity of cell mediated immunity do not secrete antibodies but they help stimulate the B cells to produce them. Immature T cells are produced in bone marrow from where they migrate to thymus via blood. In the thymus maturation of T cells occur and then they migrate to lymphoid tissue and get differentiated into three types:

a. Helper T cells: As the name suggests, they help in activating other immune cells, in other terms they are the regulator of virtually all functions of immune system. Protein mediator called lymphokines are produced by these helper T cells in order to regulate the immune functions. Some examples of these lymphokines are: Interleukin-2 interleukin-3, interferon gamma. T helper cells stimulate the B-cells to produce antibodies.

b. Cytotoxic cells or killer T cells: The lymphokine interleukin-2 is responsible for the growth and proliferation of both cytotoxic T cells and suppressor T cells. With the help of receptor proteins on the surface of killer T cells, they bind to the specific antigen. After binding, they secrete a pore forming protein called perforins which create pores on the invaders cell membrane for water to enter into it thereby cell swells and finally lyse.

c. Suppressor T cells: They suppress the function of above two T cells.

5 0
3 years ago
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