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vekshin1
3 years ago
7

An inappropriate immune system response against a nonpathogenic antigen is a(an)?

Biology
1 answer:
Novosadov [1.4K]3 years ago
3 0

Answer:

b

Explanation:

i had a test on it

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A scientist observed a bactirial specimen obtained from mud in a swamp. The bacteria are producing hydrogen sulfide which create
emmainna [20.7K]

<u>Answer:</u>

<em>Reduction of sulfur compounds and the release of hydrogen sulfide is happening here.</em>

<u>Explanation:</u>

Sulfur is an important element in the sulfur cycle. Sulfur compounds can be found on earth in various forms. They can be found in mineral rocks and organic matter. It is the <em>work of bacteria to reduce sulfur</em> compounds and convert them to sulfides.

There are different types of bacteria that reduce various sulfur containing compounds. They are <em>sulfate-reducing bacteria, sulfur-reducing bacteria, sulfite reducing bacteria etc.</em>  In a swamp there is  low oxygen availability and organic matter decays in this condition.

<em>The sulfate reducing bacteria oxidizes the organic matter  and releases Hydrogen sulfide.</em>

4 0
3 years ago
In colorectal cancer, some tumor suppressor genes are inactive. This is an important factor resulting in uncontrolled cell divis
tresset_1 [31]

Answer/Explanation:

(1) a mutation in the coding region, resulting in an inactive protein

To check to see if there is a mutation, you could extract the DNA from the cancer cells and then perform PCR to amplify the gene of interest. You could then perform sanger sequencing and compare the sequence to the normal gene to see if a mutation is present. To test the effect of the mutation, you would want to see if an active protein has been formed.

To see if a normal sized protein has been formed, you could perform a western blot, comparing the protein band to the WT protein band. If the protein is absent or much smaller, it is likely not a functional protein.

(2) epigenetic silencing at the promoter of the gene, resulting in reduced transcription.

To check for changes in the epigenetic landscape of the promoter, you could perform chromatin immunoprecipitation by extracting the chromatin from the tumour cells and using antibodies for different chromatin marks to see what has changed between the normal cells and the tumor cells. E.g. H3K9me3, H3K27me3. You would perform a pull down with the antibody of interest and then PCR for your promoter to specifically look at changes at that gene compared to normal cells. To test DNA methylation, you could perform bisulfite sequencing.

To see how transcription is affected, you could extract RNA from the tumor and normal cells, and compare the levels of RNA between the two samples by qRT-PCR

3 0
3 years ago
The coat of the t2 virus consists of what kind of macromolecules? see section 15.1 ( page 318) . the coat of the t2 virus consis
Karolina [17]
<span>The correct answer is protein.</span>  
<span>
T2 virus is also known as Enterobacteria phage T2. This virus is a bacteriophage, which means that infects and kills E. coli. It consists of DNA and protein: the genome is linear double-stranded DNA, with repeats at either end and the protective coat is protein.</span>
4 0
3 years ago
What is meant by “concentration”? How can you increase the concentration of salt (electrolytes) in a solution of water? How can
GuDViN [60]

Answer:

The concentration of a substance is the quantity of solute present in a given quantity of solution.

3 0
3 years ago
What event in meiosis I leads to the cell becoming haploid?
Andreas93 [3]
<span>Formation of bivalents lead to spindle fibers from opposite poles attaching to homologous chromosomes.

Hope this helps!!</span>
6 0
3 years ago
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