What process lead to biological nitrogen fixation?

1 answer:

7 0

The Rhizobium or Bradyrhizobium bacteria colonize the host plant's root system and cause the roots to form nodules to house the bacteria. The bacteria then begin to fix the nitrogen required by the plant.

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Examine the animal cells as they are each in a specific phase in their life cycle. Then, identify the phase and what is occuring

Sveta_85 [38]

The life cycle of an animal cell consists of two phases called interphase and mitosis.

The interphase is characterized by the moment in which the cell is in intense methadological activity. At this point, it is possible to see that the cell has increased in size and has become wider and more robust. This phase is divided into three sub-phases called G1, S and G2.

In subphase G1, it is possible to observe that the cell is causing the synthesis of RNA and proteins on a large scale,

In subphase S, it is possible to observe that DNA division is taking place.

In the G2 subphase, it is possible to visualize that the cell is forming microtubules of the mitotic spindle. In addition, RNA and proteins are produced, but in lesser quantities.

After interphase, mitosis begins, which is the period of cell division, where two daughter cells identical to the mother cell are generated. Mitosis has the following phases: prophase, prometaphase, metaphase, anaphase and telophase.

In the prophase, it is possible to notice that the chromosomes were duplicated and formed pairs of chromosomes (the sister chromatids). In this phase it is also possible to see the condensation of the promatin, the formation of the mitotic spindle and the disappearance of the nucleolos.

In the first phase, it is possible to visualize that the chromosomes have become condensed and are connected by the poles and not by the middle anymore. At this stage, the nuclear membrane also disappears.

In the metaphase, it is possible to visualize that the chromosomes move to position themselves in the cell equatorial plane (sister chromatids are still formed).

In anaphase, it is possible to visualize the separation of the sister chromatids, generating child chromosomes, which are separated and moved to opposite ends in the cell. At that point, the cell takes on an elongated shape. Child chromosomes form pairs and look the same as normal chromosomes.

In telophase, it is possible to visualize the formation of new nuclei at each end of the cell. The spindle microtubules are destroyed, the comosomes are decondensed and the cell is ready to be divided.

8 0

4 years ago

What is the difference between mitosis and meiosis? A. Mitosis produces 2 genetically unique haploid cells, while meiosis produc

AleksAgata [21]

The correct answer is C. Mitosis produces 2 genetically identical diploid cells, while meiosis produces 4 genetically unique haploid cells.

Mitosis is where a parent cell duplicates its genetic information before dividing into 2, therefore, the daughter cells from mitosis are completely identical to their parent cell and the other daughter cell, and we call the cells which has complete genetic information as diploid. Mitosis is very useful in repairing, growth, asexual reproduction etc.

Meanwhile, meiosis involves 2 times of division. The parent cell first duplicates its genetic information, but then swapping them, and divide. 2 new cells are produced. Then these 2 cells are further divided but without duplicating the genetic material. Therefore, this results in 4 genetically different cells. We call them haploid, as they only have half of the chromosomes from their parent, which is the opposite of diploid. Meiosis is important in producing sex cells.

8 0

3 years ago

How would road construction through a forest most likely affect the ecosystem

MAXImum [283]

It would be taking animals homes and if they don't have a home they could die. Also it could generally mess up their way of living and some would have to adjust to a new life style. I hope this helped <3

8 0

3 years ago

Cells of a multicellular organism are specialized. What does this statement mean

alexdok [17]

This means that certain cells are made by the body for different reasons. For instance, muscular cells are made for muscles, bone for bones, etc.

Hope this helped!

7 0

3 years ago

All plants and some algae have a complicated life cycle that includes both a multicellular diploid _______ stage and a multicell

vladimir2022 [97]

Answer: sporophyte, gametophyte, alternation of generation

Explanation:

Alternation of generation is a kind of life cycle seen in plants and algae in which the diploid asexual and haploid sexual stages exist. A sporophyte is multicellular and diploid which is an asexual stage. It produces the haploid spores through meiosis. The haploid spores germinate to produce haploid gametophyte. The gametophyte produces gametes by the process of mitosis.

8 0

3 years ago