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Feliz [49]
3 years ago
7

What is an example of a mechanical barrier for our immune system?

Biology
2 answers:
dybincka [34]3 years ago
6 0

Answer:

a skin

Explanation:

Mechanical barriers physically block pathogens from entering the body. The skin is the most important mechanical barrier. In fact, it is the single most important defense that the body has against pathogens

navik [9.2K]3 years ago
5 0

I think it is nose hairs because it keeps harmful things from entering through your nose.

Answer is B.

*Please correct me if I am wrong.

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What you observe when examining the onion root tip using the low-power lens
bezimeni [28]

Explanation:

Low power objective shows more field of view but does not give appreciable details about the view.

  • In the root tip of onions, the cell walls are distinctly visible and they are arranged in a rectangular mosaic pattern.
  • The nucleus stands out appreciably and it is tiny.
  • The cytoplasm is also visible.
  • Root cells do not have chloroplast since they do not take part in photosynthesis.

Learn more:

Onion cell brainly.com/question/2855039

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4 0
3 years ago
Nutrients in the deep ocean come from dead marine organisms. <br>True<br>False​
Viktor [21]

Answer:

True

Explanation:

The deep parts of an ocean receive minimal or no sunlight. Hence, the survival of phototropic organisms like plants and algae is impossible or minimal here. Hence, there is a very little diversity in deep oceans. The organisms living here have to feed on dead decaying matter or on each other for survival. Mostly, the organisms living here use dead organisms as food. No other food source is available here.

5 0
3 years ago
Which of the following molecules are not required to express a gene in eukaryotic cells?
slava [35]

Answer:

Repressor protein

Explanation:

Repressor is a protein that binds to deoxyribonucleic acid(DNA) or ribonucleic acid(RNA) it inhibits the expression of one or more genes which is done by binding to the associated silencers.

A DNA binding repressor works by blocking the attachment of RNA polymerase an enzyme that enhance transcription to the promoter, thus preventing genes from been transcribed into messenger RNA.

An RNA binding repressor binds to the messenger RNA and prevents translation of the bases on the messenger RNA into protein. The blocking of expression is called repression.

4 0
3 years ago
(20 POINTS + BRAINLIEST)
Svet_ta [14]

All amino acids are structurally the same, in that they contain a central carbon atom, an amine group, a lone hydrogen at. Our DNA is contained in our chromosomes. The thing that is different about each of the 20 amino acids is the make-up of the R group

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3 years ago
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Telophase happens. hope this helps
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