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PSYCHO15rus [73]
3 years ago
15

Nitrogen-fixing bacteria remove nitrogen from plants and return it to the soil. true or false?

Biology
1 answer:
Artemon [7]3 years ago
6 0
The answer is:  [B]:  "False" . 
__________________________________
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Genetic recombination plays a role in both maintenance and diversity within an organism. Explain how this balance is achieved an
weeeeeb [17]

Answer:

Crossing-over between homologous chromosomes (prophase 1), the random lining of homologous chromosomes (metaphase 1), and random fertilization are the mechanisms involved in genetic variation.

Explanation:

Crossing-over between homologous chromosomes (prophase 1), the random lining of homologous chromosomes (metaphase 1), and random fertilization are the mechanisms involved in genetic variation.

The Crossing-over events occur between two homologous chromosomes in the equatorial plane and make the daughter cells genetically different from the original one. The Chiasma is the position where two homologous chromatids interchange genetic information, giving a place for new genetic material or information to be provided to descendants. After crossing over, homologous chromosomes get separated again.  

On the equatorial plane, homologous paired together, randomly aline with their kinetochores facing opposite poles. The random arrangement of tetrads is different in every cell going through the meiosis process. There is no equal alinement between two cells. When tetrads aline in the equatorial plane, there is no predetermined order for each of the homologous chromosomes of each tetrad to face one of the poles and then migrate to it while separating.  Chromosomes of the homologous pair arrange to face any of the poles to migrate forward to it. Each of the chromosomes has two possibilities for orientation at the plane. When the new haploid cells are formed, the number of variations in each cell is also different and depends on the chromosomes that form that cell. The order in the equatorial plane is what introduces variation into the gametes, being almost impossible for two gametes to have the same genetic charge.  

Independent assortment occurs when the alleles from two or more different genes distribute in gametes independently from each other. In other words, a gamete receives an allele from a gene that does not depend on nor influence the allele of another gene in the same gamete. This can only be applied to independent genes. An organism gets only one of the members of the chromatids pair of each parent.  

7 0
2 years ago
5. All of the following are functions of nonspecific defenses, EXCEPT:
NISA [10]

Answer:

To hinder a pathogen from entry into the body

Explanation:

This pathway can only act in the specific pthogen, making it specific

6 0
3 years ago
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Please help me with question 15 and 16
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Answer:

Explanation:

When it gets hot the photosynthesis will rise,Because The more sun the more growth

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Contaminated soil can be rehabilitated by physical remediation methods, like aeration. What is another way soil can be treated t
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Answer:

C) Flush out the contaminants with an excessive amount of water.

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Water is universal solvent. It dissolve many solutes inside it. Soil is contaminated with number of chemicals which is used by farmers for the controlling of pathogens. These chemicals remains on the soil for very long time. These chemicals are removed from the soil by applying high amount of water which flush out the chemicals from the soil.

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An object, such as a pair of scissors, can become a temporary magnet by rubbing the object with the end of a magnet.
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In my opinion it is true
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