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777dan777 [17]
3 years ago
13

What is nitrogen fixation and why are bacteria crucial to this cycle of life?

Biology
1 answer:
soldier1979 [14.2K]3 years ago
6 0
Nitrogen fixation- atmospheric nitrogen is assimilated into organic compounds especially by certain microorganisms as part of the nitrogen cycle.
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During an experiment, India examines prepared slides that her teacher has given her. One of the slides shows a single-celled org
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Cell membrane; separates a cell from its environment. ... Both types are found in the same multicellular organism, but one cell type produces many proteins, and the other does not

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3 years ago
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What kind of mutation repair does not involve the removing and repairing of nucleotides?
Pavel [41]

Direct repair is mutation repair that does NOT involve the removing and repairing of nucleotides

A mutation in biology is an adjustment to the nucleic acid sequence of an organism's, virus's, or extrachromosomal DNA. DNA or RNA can be found in the viral genome. Since mutation results in a new DNA sequence for a particular gene, resulting in a new allele, it is crucial as the initial stage of evolution. Through intragenic recombination, recombination can also produce a new DNA sequence (a new allele) for a particular gene.

DNA proofreading and repair systems often identify mutations and mutation repair. The cell will also go through programmed cell death (apoptosis), which prevents the flawed DNA from being passed on if the damage cannot be repaired. Only when these systems are compromised do mutations take place and are transmitted to daughter cells.

What kind of mutation repair does NOT involve the removing and repairing of nucleotides?

a. mismatch repair

b. base-excision repair

c. direct repair

d. None of the above, because all repair involves the removing of mutated nucleotides.

To know more about mutation refer to: brainly.com/question/7488281

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4 0
2 years ago
True / Fasle
nydimaria [60]

Answer: True, both of the given statements are true.

Explanation:

1. Nearly all the environment contains microorganism whether it is soil, air, water or any other surface. They have the ability of live in the extreme conditions.

There are different forms of bacteria found at different places. Some of them are thermophiles that at found in extremely hot conditions such as thermal vents.

The organism like Psychrophiles are the microorganisms that have the ability to survive at lower temperatures. Example: bacteria found in polar regions.

2. A culture can be defined as a pure culture if it has an unadulterated species of bacteria. It has no contamination and if a small inoculum from the pure sample is streaked on a plate then a pure culture of the sample is obtained.

This should be done in an aseptic condition so that the bacterial species should be free from contamination.

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3 years ago
Why does relative enzyme activity shown in figure 8.15a appear to drop off, when other studies have shown that reaction rates te
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It seem like there are information missing on the question posted. Let me answer this question with all I know. So here is what I believe the answer is, the catalyst has acted upon it.

Hope my answer would be a great help for you.    If you have more questions feel free to ask here at Brainly.
6 0
3 years ago
Millipedes have two legs per segment while centipedes have only one pair of legs per segment. true or false
12345 [234]

Answer:

True

Explanation:

Milipedes belong to a class of organism known as diplopoda which have double foot. Thus, millipedes have two legs per segments. They usually have  two pairs of jointed legs. The double legged segments have formed out of two single segments fused together

On the other hand ,  a centipedes has  only one pair of legs per segment.

Thus the given statement is true.

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3 years ago
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