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Biology

1 answer:

Sauron [17]3 years ago

3 0

Water pollution comes from many sources. One of the biggest sources is runoff. Runoff moves over the surface of the land and picks up chemicals such as fertilizer (contains vital nutrients such as nitrogen, phosphorous, and potassium - NPK) from agricultural fields, lawns, and golf courses. It carries the chemicals to bodies of water. The added nutrients from fertilizer often cause the excessive growth of algae, creating algal blooms which are temporary phenomena because the large population of algae use up the available nutrients (Figure 2.4c). When the algae die, the decomposing bacteria use up oxygen in the water so that other aquatic organisms cannot survive. This has occurred over large areas of the ocean, creating dead zones, where low oxygen levels have killed all ocean life. A very large dead zone exists in the Gulf of Mexico. Measures that can help prevent these problems include cutting down on fertilizer use. Preserving wetlands also helps because wetlands filter runoff.

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We know that animals can be separated into two big groups: vertebrates and invertebrates. An example of each would be a horse an

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skelet666 [1.2K]

Answer:

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Explanation:

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2 years ago

I was wondering if my answer was right ?

Naya [18.7K]

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Smilin is a (hypothetical) protein that causes people to be happy. It is inactive in many chronically unhappy people. The mRNA i

Studentka2010 [4]

Answer:

The single nucleotide mutation affects the splicing of the mRNA molecule of Smilin in unhappy people. This with result in a truncated protein lacking part of it amino acidic chain

Explanation:

It's true that the information of aminoacids that form the proteins is codified on the exons, but introns also have important information, for example, the sequences related to the splicing of the mRNA exons.

Briefly, during the splicing process, the introns are removed, leaving the mRNA that is going to be translated (there could be also other post translational modifications before going to ribosomes).

Also, there's different ways to splice the different exons. For example, let's say a mRNA has four exons, so the mature mRNA could have exons 1-2-3-4, or 1-2-4, or 1-2-3, it depends on the location of the splicing signals. This are called splicing alternatives, so the same original mRNA can give arise to different forms of a protein.

In the particular case of Smilin, apparently the DNA has a single mutation in the intron for the mRNA of the protein. Despite it might seem as a minor difference, it causes the final mRNA (the one that is translated) to lose an internal stretch of 173 nucleotides.

A possible explanation is that this single mutation is affecting a splicing signaling sequence, making the splicing complexes skip one exon. Again, if we imagine that the original protein has four exons, this means that the happy people has an mRNA with all the exons, while unhappy people is lacking one.

As a result, the protein Smilin will be lacking part of its internal region. The actual effects this has on the protein function will depend on the role of the deleted section.

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3 years ago

HELPP PLSSS :) American pikas are prey to long-tailed weasels. Which change in a limiting factor would increase the carrying cap

Damm [24]

Answer:

A. increase in American pika population size

Explanation:

Carrying capacity is the idea that relates to how much population can an environment sustain before collapsing. Here, the answer would be A. increase in American pika population size because if you increase the food for weasals, naturally the population carrying capacity goes up because now the environment has food to feed the weasals which can contribute to increasing the carrying capacity (i.e. the environment can now handle larger population of weasel than initial condition)

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3 years ago