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ololo11 [35]
2 years ago
5

Which conclusions are correct from the thin-layer chromatography of the inks?

Biology
1 answer:
Dennis_Churaev [7]2 years ago
8 0

Based on the result in this experiment, the mobile phase rose up on the TLC plate then dragged the ink from the marked dot up along the TLC plate, which is the light pink pigment whose Rf was 0.98 had the greatest affinity to the mobile phase. Moreover, the pigment that was closer to the marked dot was more attracted to the stationary phase, which is the dark pink spot that had an Rf of 0.72 and had a greater affinity to the stationary phase.

 

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He peppered moth provides a well-known example of natural selection. the light-colored form of the moth was predominant in engla
mixas84 [53]
The reason for the loss of color after the industrial revolution is that the light-colored moths were "selected against" by predators. These birds could only see the light ones against the newly dark, sooted background. Over time, these predators could no longer distinguish the dark ones from their natural dark, sooted background. Thus more light-colored moths stood out against the dark soot, and were eaten. And more dark-colored moths eluded the birds, survived to reproduce, passing on more of their dominant genes for dark color to their offspring. After several decades of hundreds of thousands of generations, most of the later generations were dark, due to selective advantage of camouflage to survive predation.
5 0
2 years ago
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A population of beetles changing from yellow to green and surviving better is an example of
Nata [24]

Answer:

C. natural selection

Explanation:

Natural selection is when the organisms that have the better adaptation so they survive. In this case, the green was the better adaptation so they lived.

6 0
2 years ago
A newly developed pesticide has been observed to bind to an intracellular hormone receptor. If ingested, residue from this pesti
Degger [83]

Answer:

Thyroid hormones      

Explanation:

Animals and people exposed to pesticides such as insecticides, fungicides, and herbicides, have shown to be affected by their effect on the thyroid. These chemicals can produce endocrine alterations acting as thyroid disrupters. They affect many mechanisms in the organisms such as inhibition of thyroid iodine uptake, <u><em>interference with the thyroid hormone receptor</em></u>, binding to transport proteins, among others. They cause toxicity in the functioning of the hypothalamic-pituitary-thyroid axis.

There are many studies that associate thyroid diseases with exposure to organochloride pesticides. Significant alteration in the TSH, T3, and T4 levels have been expressed by people directly or indirectly exposed to the chemicals.            

5 0
2 years ago
A very active person uses a large amount of energy and therefore has a high
mamaluj [8]
A) a temperature is regulated by the body: so, not.

b) - rather not, most likely cholesterol level would be low

c) this is rather intedependent - a person can be active even without a fat diet.

d) I think this is the best answer. Metabolism is the exchange of energy in food into the energy that people use.
7 0
3 years ago
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At what latitude can the noontime sun be observed in the northern part of the sky
kvv77 [185]
60 hope this helps mark as brain lists
4 0
2 years ago
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