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notka56 [123]
3 years ago
5

Component

Biology
1 answer:
miskamm [114]3 years ago
3 0

Aphids get resistant to pesticides often.

<h3><u>Explanation</u>:</h3>

Aphids are the small bugs that are found in plants and are generally green to red in colour. Aphids are often found to be resistant to the common organophosphates or anticholinesterase pesticides that are commonly used. They do this by means of one of the three processes.

The normal genotype which has no resistance mechanism did respond to the insecticide by up-regulating 183 genes. These genes were mostly related to energy metabolism, detoxifying enzymes, proteins of extra cellular transport, peptidases and cuticular proteins.

The second mechanism of the is seen in second genotype which is resistant through a kdr sodium channel mutation. They up-regulated 17 genes which are coding for detoxifying enzymes, peptidase and cuticular proteins.

The third mechanism is seen in those groups which are multiply resistant genotype that carrying kdr and a modified acetylcholinesterase. They are found to up-regulated only 7 genes and appeard not to require induced insecticide detoxification. Instead they down-regulated many genes.

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The major disadvantage of a blood-brain barrier is that ____.​
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4 0
3 years ago
Certain types of ________ have a relationship with certain plants where they help convert nitrogen into a usable form.
Viefleur [7K]

Answer:

Answer is C. Bacteria

Certain types of bacteria have a relationship with certain plants where they help convert nitrogen into a usable form.

Explanation:

Nitrogen is abundant in the atmosphere, but plants cannot use it because of the absence of a necessary enzyme, nitrogenase, which converts nitrogen into a usable form.  So they form a symbiotic relationship (mutually-beneficial arrangement) with nitrogen fixing soil bacteria (rhizobia) which perform biological nitrogen fixation. Biological nitrogen fixation is a process in which the symbiotic nitrogen-fixing bacteria coverts atmospheric nitrogen into ammonia and organic derivatives that plants can use to synthesize proteins.  This bacteria form nodules on the roots of plants like legumes in which nitrogen fixation takes place.

Both plants and bacteria benefit from this symbiotic relationship, as the plant obtains ammonia to synthesize proteins from nitrogen in the atmosphere while bacteria obtain carbon compounds from the plant produced through photosynthesis and a secure environment to grow. As the plant roots leave behind some of the usable form of nitrogen in the soil, this process also increase soil fertility.

4 0
3 years ago
A population of kangaroos is growing at a rate of 2% per year, compounded continuously. If the growth rate continues, how many y
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The correct answer is 20 years.

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A = Pe^rt

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3/2 = e^0.02t

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After taking log from both the sides:  

ln(1.5) = 0.02t * ln(e) [ln(e) = 1]

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t = 20.27

Thus, it will take around 20 years for the size of the population to reach 150 percent of its present size on the basis of the exponential growth function.  

7 0
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