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4 years ago

why does prolonged exposure to UV light from the sun or tanning beds increase the risk of getting skin cancer

1 answer:

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In short, because the UV rays damage skin cells, which increases the risk of a mutation possibly leading to skin cancer.

Hope this helps.

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Zebra mussels were first discovered in North America in the Great Lakes in 1988. This invasive species eats phytoplankton and ot

Vinvika [58]

B. The answer is B :)

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3 years ago

Read 2 more answers

In a titration experiment, a 10.00 ml sample of H2SO4 was titrated with 33.25 mL of 0.777 M KOH.

german

Answer:

1.292 M

Explanation:

<em>In order to calculate the concentration of H2SO4, we need to get the balanced equation of reaction first;</em>

$H_2SO_4 + 2KOH --> K_2SO_4 + 2H_2O$

Using the formula:

CaVa/CbVb = na/nb

where Ca = concentration of acid, Va = volume of acid, Cb = concentration of base, Vb = volume of base, na = number of moles of acid, and nb = number of moles of base.

In this case, Ca =?, Va = 10.00 ml, Cb = 0.777, Vb = 33.25 ml, na = 1, nb = 2

Ca = CbVbna/Vanb = 0.777 x 33.25 x 1/10 x 2

Ca = 1.292 M

Hence, the concentration of H2SO4 is 1.292 M

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4 years ago

Sam demonstrated the formation of a type of rock. He stacked layers of cake, frosting, and jam and then squeezed the stack. The

Ber [7]

I believe it would be sedimentary, since layers are used. Hopefully this helps :)

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3 years ago

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I am a circulating cell involved in ige type allergic reactions. i am a mediator of allergic reactions because i can release gra

777dan777 [17]

Answer:

I am a basophil.

Further information:

Basophil:

Basophils are a type of white blood cell. Basophils are the smallest common of the granulocytes, representing about 0.5 to 1% of circulating white blood cells. Yet, they are the major type of granulocyte.

Function of basophil:

They are accountable for inflammatory reactions during immune response, as well as in the development of acute and chronic allergic diseases, including anaphylaxis, asthma, atopic dermatitis and hay fever. They also yield compounds those co-ordinate immune responses, including histamine and serotonin that induce inflammation, heparin that stops blood clotting, although there are less than that found in mast cell granules.

Basophils may present in many specific types of inflammatory reactions, specially those that cause allergic symptoms. Basophils have anticoagulant heparin, which prevents blood from clotting too rapidly. They also have the vasodilator histamine, which promotes blood flow to tissues.

Structure of Basophil:

Basophils comprise large cytoplasmic granules which vague the cell nucleus under the microscope when stained. However, when unspotted, the nucleus is visible and it usually has two lobes. The Mast cell which is another granulocyte has very like in appearance and function. Both cell types store histamine, a chemical that is secreted by the cells when inspired. However, they arise from different branches of hematopoiesis, and mast cells usually do not circulate in the blood stream, but instead are located in connective tissue. Similar to all circulating granulocytes, basophils can be carried out of the blood into a tissue when we need it.

Answer details:

Subject: Biology

Level: High level

Keywords:

• Basophil

• Function of Basophil

• Structure of Basophil

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