You have been studying a large lake ecosystem. You learn that toxins have been dumped into the water. You predict that the population with the highest concentration of the toxin would be theducks
zooplankton
algae
predatory birds
small fish

Answers

Answer 1
Answer:

The correct answer is predatory birds.  

The flowing of toxic chemicals and heavy metals into the water body when the agricultural, industrial, and human wastes run off or are discharged intentionally into the water body is known as biomagnification. These pollutants result in genetic mutations, disease, reproductive difficulties, birth defects, death, and behavioral modifications in various marine species.  

However, the extremity of the destruction varies significantly among the species. In various circumstances, the animals close to the top of the food chain are most influenced by the procedure of biomagnification.  

Several of the harmful toxins get settle at the lower level in a water body and are then consumed by the species, which feed or live on the bottom dwellers. As these constituents are not digested, they gathered inside the bodies of the species, which consumes them.  

It signifies that the higher level predators, like fish, birds, or marine mammals accumulate more harmful concentrations of toxic substances in comparison to the animals lower on the food chain. Thus, in the given case, the more concentrated amount of toxins would be found in the predatory birds.  


Answer 2
Answer:

Final answer:

In a large lake ecosystem, the population with the highest concentration of the toxin would likely be the zooplankton. This is because they consume contaminated algae, transferring and concentrating the toxins in their bodies.

Explanation:

The population with the highest concentration of the toxin in a large lake ecosystem would likely be the zooplankton. Zooplankton are primary consumers that feed on algae, which is where the toxin would accumulate. As they consume contaminated algae, the toxin would be transferred and concentrated in their bodies.

Although other organisms like ducks, predatory birds, and small fish may also be affected by the toxin, the highest concentration is expected in the zooplankton because they have a direct dependence on the algae.

This scenario is applicable to a Biology class in High School, where students learn about ecological interactions and trophic levels.

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Why is it important to sequence your plasmid after purifying it?

Answers

Here is my suggestion. ALWAYS you digest a vector you should do a gel-purification step. Some people will say that they don't do it because it's a waste of time and that is ok, however, if you do it you are practicing good molecular biology as defined by Sambrook&Maniatis, and these guys knew something about it. Therefore, I will encourage you to do this step as often as you can, this will ensure you have no traces of undigested vector that will interfere during your transformation step (e.g. false positive) and consequently save you time later. The best way to save time is to do it right. You also want to get rid of buffers and ions that may (or may not) interfere with your phosphatase steps and have a clear start too. The later is not so critical though, as most reagents are now quite compatible with each other as well as between companies, which is great. Then, after phosphatase treatment the cleaning step depends on two things: if you used CIP (NEB), this enzyme you MUST gel-purify (recommended) or use a kit to get rid of the CIP that tightly binds to the end of your DNA and cannot be heat inactivated. If you used TSAP (Promega) 0r any other thermosensitive phosphatase, then you can heat inactivate it. The next thing to take into account is to check the buffer compatibilities between your recently 'phosphatased' vector, your digested construct and your ligation buffer. Most of the T4 DNA ligase in the market are compatible with any of the buffers for restrictions and phosphatase. For your Insert in the experimental setting you have provided, I believe you can skip it.

The villi decrease the surface area of absorption. (True or False)

Answers

The answer is false.
Villi actually increase the surface area.

Final answer:

False.

Villi actually increase the surface area for absorption in the small intestine.

Explanation:

The statement 'The villi decrease the surface area of absorption' is False.

In fact, the villi in the small intestine increase the surface area available for absorption. Villi are small finger-like projections that line the inner surface of the small intestine. They are covered with tiny microvilli, which further increase the surface area. This increased surface area allows for more efficient absorption of nutrients from digested food in the small intestine.

Without the villi, the surface area for absorption would be significantly reduced, making the digestion process less efficient.

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Maribel places her backpack and lunch bag on a lab table where there are lab materials. What is the safest way for Maribel to arrange the items?Both the personal items and the lab materials should be arranged neatly along the edge of the table.

Both the personal items and the lab materials should be arranged in the center of the table.

The lab materials should be in the center of the table, and the personal items should be on the edge of the table.

The personal items should be off the table, and the lab materials should be placed neatly away from the edge of the table

Answers

The answer is The personal items should be off the table and the lab materials should be placed neatly away from the edge of the table.
As a general rule, personal items and lab items should not mix, especially food items like a lunch bag. Certain lab materials can be dangerous if touched or handled without the proper protective gear. By placing personal items so close, you are increasing the risk of accidents, which is also why lab materials should be away from the edge of the table.

A turgid plant cell would be found in which type of environment

Answers

It will be found in an hypotonic solution.

What characteristic of plate movement makes it difficult for geologists to make short-term predictions about earthquakes

Answers

The plate movements cause slips that occur at irregular intervals and often with a very lag period. That causes the plate movement make it difficult for the geologists to make a short-term prediction regarding the incoming earthquakes.

Which therapeutic cloning application is most likely a benefit to society

Answers

Answer:

The correct answer is production of nerve tissue, which may help in treating paralyzed patients.

Explanation:

Cloning that is developed mainly as a therapy for a disorder is considered as the therapeutic cloning. In this form of cloning, the nucleus from the cell is withdrawn and is kept within a fertilized egg that does not possess a nucleus. It permits the self-cells of the individuals to be utilized in curing the condition, without imparting the threat of presenting foreign cells, which may get rejected.

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