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4 years ago

What are hypotheses suggesting why urban children have more food allergies than children from rural areas?

1 answer:

6 0

Answer: Rural children are in contact with many allergens that train their immune systems. While Urban children are exposed to chemical pollutants that sensitize their immune systems and make them more prone to allergies.

Explanation:

An allergy is a reaction of your immune system to something that doesn't bother most other people. Allergy sufferers are often sensitive to more than one thing. For example, pollen, bee venom, pet dander or a food that does not cause a reaction in most people.

The purpose of the immune system is to defend the body against harmful microorganisms such bacteria, viruses, and fungi. The immune system produces substances known as antibodies, and in this type of reaction the antibody that is produced is called immunoglobulin E (IgE). When you have allergies, your immune system produces antibodies that identify a particular allergen as harmful, even if it is not. When you come into contact with the allergen, your immune system's reaction can cause the skin, sinuses, airways, or digestive system to become inflamed.

There are now many studies showing that contact with the rural area in the first years of life reduced the risk of developing allergies in the population. This is because children are in contact with allergens. Urban children are exposed to chemical pollutants that sensitize their immune systems and make them more prone to allergies. As it was said, when a susceptible person is exposed to an allergen, the body produces IgE. The next exposure may result in an allergic reaction which produces even more amounts of IgE. But this happens when there is an exaggerated and unnecessary reaction on the part of the immune system, because the person is also in contact with toxic and chemicals that affect the immune system, and make it not work properly.

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Change TCA-GAT from DNA into mRNA

gizmo_the_mogwai [7]

Answer:

AGU-CUA

Explanation:

An mRNA sequence is made using a DNA sequence as a template. The sequence is dictated by complementary base pairing.

DNA uses the bases A, T, C and G. A is complementary to T and G is complementary to C.

RNA uses the bases A, U, C and G. A is complementary to U and G is complementary to C.

When transcribing DNA to RNA:

C is paired with G
G is paired with C
A is paired with U
T is paired with A

Therefore, TCA-GAT is transcribed to AGU-CUA

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3 years ago

You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E coli cells on light 14N medium for m

Elanso [62]

Answer:

1.A single band of intermediate density.

Explanation:

According to semiconservative model of DNA replication, the two strands of one DNA molecule separate at the time of replication and each strand acts a template for a new strand. So, the resulting new DNA molecule has one old strand and one new strand.

Here, the E coli cells were grown originally in 14N medium. So all the DNA molecules had 14N strands. When they were transferred to a 15N medium, only 15N was available then for further replications. In the first round of replication in new medium, all the old 14N strands (14N14N) separated and formed a new strand each using 15N. Hence all the resulting DNA molecules had one 14N strand and one 15N strand (14N15N).

Since 14N is of lighter density and 15N is of heavier density, 14N15N strands will give band of intermediate density. Since after one round of replication all DNA molecules will be 14N15N, there will be only one band of intermediate density.

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3 years ago

Rutherford claimed that this also shows that the atom consists mostly of

Nastasia [14]

Rutherford requested that this also shows that the atom involves mostly of empty space and that all the positive charge is not uniformly spread all the way through the atom but as an alternative, squeezed into a teeny tiny nucleus in the center of the atom.

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4 years ago

Read 2 more answers

Insectivorous birds are more likely to eat medium sized insects because the exoskeleton of large insects is too hard to break, a

andrey2020 [161]

Answer:

Option A: True

Explanation:

Insectivorous birds such as bluebirds, dippers and flycatchers prefer to eat medium-sized insects. This is because like most birds, they love easy and satisfying meals. To the birds, a medium-sized insect is a good compromise because it is quite easy to chew and digest and at the same time, easy to find.

As a result, most insectivorous birds prefer to get their daily ration of proteins from the medium-sized birds.

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4 years ago

In the phosphorus cycle, phosphorus can recycle through waste products, decomposition, and of terrestrial and aquatic ecosystems

maksim [4K]

These processes are found in food chains.

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3 years ago