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natita [175]
3 years ago
14

How do plants and animals get nitrogen if not from the atmosphere?

Biology
1 answer:
GenaCL600 [577]3 years ago
8 0

Answer:

Our atmosphere (air) is comprised of 78% of nitrogen. However, this nitrogen is in its elementary state (N₂) and therefore is quite inactive, so the plants can not use it directly. Changing the elementary nitrogen into more reactive forms (NH₃, NO₂, HNO₃) is occurring through the process called nitrogen fixation. It is happening via two processes.

First one is physical nitrogen fixation. When some type of atmospheric physical energy (lightning bolt, for example) reacts with N₂, it splits it in two very reactive N atoms, enabling them to react with oxygen in order to form NO₂.

Second process is biological nitrogen fixation. It's done by bacteria, special bacteria living in the soil, able to use elementary nitrogen for its metabolical pathways resulting in production of ammonia, which can be used by plants. It's noteworthy that bacteria are responsible for about 90% of all nitrogen fixation.

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Protein X is a protein that is composed of four subunits of equal size--alpha, beta, delta, and gamma--that are bound by either
alexandr402 [8]

Answer:

The correct answer is e3

Explanation:

The given protein in the question proteib X contain four subunits of equal size alpha,beta,delta and gamma which are bound by either noncovalent interactions or disulfide bridges and only beta and delta subunits are bound to each other by disulfide bridges.

  As a result when the protein will undergo fragmentation it will generate 3 bands because the interaction that is present between alpha and beta subunit will break resulting in the formation of 2 bands. Now the most important fact is that the beta subunit is linked to delta subunit by di sulfide bond so when betamarcaptoethanol will act on protein X it will break the disulsulfide bond present between the beta and delta subunit to reduce both the subunit.

  Finally the interaction that is present between delta subunit and gamma subunit will be broken down to release the delta subunit which will form a single band during SDS PAGE..

4 0
3 years ago
When a pigment molecule in a light-harvesting complex absorbs a photon of light, what happens to its excited-state electron?.
MA_775_DIABLO [31]

When a pigment molecule in a light-harvesting complex absorbs a photon of light, While returning to its ground state, the electron transfers some of the energy from its excited state to an electron in a nearby pigment molecule.

  • It takes a photon of light energy some distance before it reaches a pigment molecule like chlorophyll.
  • An electron in the chlorophyll is "activated" by the photon. The energy imparted to the electron then moves from one pigment molecule to another until it reaches the reaction center, a pair of chlorophyll a molecules.
  • An electron in the reaction center is then excited by this energy, causing it to break loose and travel to the primary electron acceptor.
  • Therefore, it is said that the reaction center "donates" one electron to the main electron acceptor.

learn more about light-harvesting complex here:

brainly.com/question/7025086

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8 0
2 years ago
The domestication of animals came before the cultivation of plants in human history
svet-max [94.6K]

Answer:

The first attempts at domestication of animals and plants apparently were made in the Old World during the Mesolithic Period. Dogs were first domesticated in Central Asia by at least 15,000 years ago by people who engaged in hunting and gathering wild edible plants

Explanation:

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3 years ago
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SpyIntel [72]

Answer:

The answer is statement 1, 2, and 3

Explanation:

A hypothesis is a starting point for further investigation, therefore a hypothesis will always be a possibility at least until it is tested.

Variable is a factor that is liable to vary or change.

A hypothesis without being tested is merely a statement or an explanation made on the basis of limited evidence. Therefore it is unsure whether the said statement is true or not.

A hypothesis can still be proven by further investigation with different variables

6 0
4 years ago
If a wave has a wavelength of 1 kilometer, it must be a(n)
Svetradugi [14.3K]
Hey there!

I believe the answer you're looking for is radio wave

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4 years ago
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