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photoshop1234 [79]
3 years ago
15

Do you think the practice of reusing materials is easy or difficult? Explain your thinking.

Biology
1 answer:
Mama L [17]3 years ago
8 0

Answer:

difficult

Explanation:

I guessed because I'm smart

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What is the basic difference in effector function between helper and cytotoxic T cells?
3241004551 [841]

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
How might the effectiveness of nectar change if it had a bitter taste?
Dmitriy789 [7]
I don’t think it would change the effectiveness , if bees got used to it or it had always been like that, they wouldn’t have a problem, but if it was a sudden change then they might dislike it
8 0
3 years ago
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Which of the following Solar System objects travels in an orbit around the Sun?
noname [10]

Answer:

here u go hope it is helpful

6 0
3 years ago
Should the amendment , which allows for free speech , include all types of speech ? What about bad language racial slurs , and o
Afina-wow [57]

Explanation:

No because a speech has to be a meaningful speech

3 0
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Exposure to toxins during early stages of pregnancy is more likely to cause birth defects than exposure in late pregnancy becaus
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1. Essential organs form during early development

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Harmful chemicals (toxins) cause the most disease when they are present during fetal development, because organ systems are being developed and the rate of growth is very fast.

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