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IgorC [24]
3 years ago
15

A protective layer that shields the surface from lethal ultraviolet light is found in which layer of the atmosphere?

Biology
1 answer:
Aloiza [94]3 years ago
5 0
A protective layer that shields the surface from lethal ultraviolet light is found in the layer of the atmosphere known as the Stratosphere. 

Therefore, the correct answer is option C for this specific statement.<span />
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For a science experiment. John gradually added a sedium hydroxide (NaOH) solution to warm vegetable oil in a glass test tube. He
Marrrta [24]

The sodium hydroxide solution and vegetable oil underwent a chemical change.

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

The reaction between a base and a fat or fatty acid is called as saponification reaction. Here the base dissociates into the cation and hydroxyl ion. The hydrogen from the fatty acid of the oil reacts with the hydroxyl ion to form water which is basically the neutralization reaction. This cation now reacts with the rest of the fatty acid to form a bipolar molecule which is the soap. During the reaction, the solution becomes cloudy but with time, it again goes back to solution. The cloudyness appears because oil isn't soluble in water based solutions and the base is actually made solution in water.

Here the sodium hydroxide reacts with oil to form water and the soap molecule which is a chemical change.

6 0
3 years ago
What is the effect on transcription of the structural and regulatory genes of the lac operon when lactose is present in the envi
vova2212 [387]

In the lac operon, glucose also plays an important role along with lactose. When Lactose is present in the environment along with glucose then it cannot deactivate the regulator gene [repressor], as a result, the repressor will bind to the operator and the transcription will be blocked.

When Lactose is present in the environment without glucose then the Catabolite repressor protein will bind to the CAP Site, and lactose will bind to the repressor [regulatory gene product], as a result, the repressor gets deactivated and the transcription takes place.

Lac operon: It is a set of three structural genes z, y, and a which are all transcribed and regulated under one single promoter. The three genes code for β-galactosidase, lactose permease, and transacetylase respectively.

β-galactosidase is responsible for breaking the lactose into glucose and galactose, lactose permease is responsible for transporting lactose across the cell membrane and transacetylase attaches a particular chemical group to target molecules.

Learn more about Lac operon here

brainly.com/question/1217140

#SPJ4

7 0
2 years ago
The ability of body systems to increase their function, given the need to adapt, is known as the The ability of body systems to
Whitepunk [10]

Answer:

The ability of body systems to increase their function, given the need to adapt, is known as the <u>physiologic reserve.</u>

Explanation:

The ability of body systems to increase their function if the need to adapt arises is known as a physiological reserve. Frequently, this term is used to refer to the operating limits of a particular physiological system when under stress. When this stress exceeds the ability of a particular organ or system to compensate for it, organ failure occurs. Adaptation achieves its highest efficiency when changes are generated gradually/progressively rather than abruptly. In aging, this reserve is diminished and therefore the ability of the organs to adapt to stress is lower, that is, the ability to adapt is reduced in extreme ages.

6 0
3 years ago
Which process works with erosion to break down rock?
TEA [102]
The correct answer would be weathering. Can u give brainiest
7 0
3 years ago
Read 2 more answers
Some organisms can reproduce both sexually and asexually. Being able to reproduce asexually is beneficial in situations where ma
Ber [7]
"It will increase the frequency of genetic mutations. *i think this one* It will result in reduced genetic diversity within the species. It will make the species unable to reproduce sexually. It will decrease the life span of the species." - hope that helps not my work tho some one else wrote this
7 0
3 years ago
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