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Zepler [3.9K]
1 year ago
5

Astrocytes and tight junctions create a barrier to viruses and bacteria known as

Biology
1 answer:
Soloha48 [4]1 year ago
4 0
<span>Answer:The blood-brain barrier (BHE)

 BHE is a barrier that's highly permeability selective and protects the central nervous system  from potential dangers like viruses, bacteria and parasytes that may be circulating int he blood. <span>It is composed of endothelial cells, astrocytes, pericytes.</span></span>
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Carbohydrates are the main sources of energy for most organisms. However, some carbohydrates can also be used as structural mate
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3 0
2 years ago
Read 2 more answers
A pathologist who wants to examine a patient's liver cells to determine if the mitochondria have an internal structural defect w
BlackZzzverrR [31]
The correct answer is "transmission electron microscope".

The transmission electron microscope can magnify the organelles of the cell clearly; as in light microscopes wherein most organelles cannot be visualized. TEM works by using a beam of electrons to pass through a specimen to make a clear image. Because of its superior magnification, mitochondrial defects can be visualized easily.

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4 0
2 years ago
Troy heads a large-scale farm that specializes in cattle. Which title best describes Troy’s position?
Margaret [11]

Answer:

farm hand

Explanation:

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5 0
2 years ago
Which statements could be categorized in the "Asexual" section of the Venn diagram? Check all that apply
EastWind [94]

Answer:

The right answer are : mitosis, diploid cells, and identical DNA.

Explanation:

The answers "two cell divisions" and "gametes" refers to a division by meiosis which is a sexual reproduction.

Asexual reproduction or asexual reproduction is a mode of reproduction, which - as opposed to sexual reproduction - corresponds to the capacity of living organisms to multiply alone, without a partner, without involving the fusion of two gametes of opposite sexes. Asexual reproduction is observed in multicellular (animal and plant) and unicellular organisms. In botany, the term often used for the asexual multiplication of plants is vegetative multiplication. In all cases of asexual reproduction, the result is identical to the mother.

7 0
2 years ago
Which of the following is primarily responsible for limiting the number of trophic levels in most ecosystems?
solniwko [45]

Answer:

(B) Energy transfer between trophic levels is almost always less than 20% efficient.

Explanation:

The ultimate source of energy on the Earth is the Sun. The energy coming from the Sun is captured by green plants by the photosynthesis. During photosynthesis sun energy   is fixed into chemical energy (carbohydrate). So, in an ecosystem energy flow is unidirectional (from sun to the green plants). The fixed chemical energy from green plants is transferred to the herbivores then to carnivores through food. When one organism eats another organisms, only 10 % of the energy present in the organism is transferred as a food for the next organism and a large amount of energy is lost as heat into the environment. Thus, energy keeps on decreasing when stored energy moves from producers to top consumers. Thus, less than 20% energy transfer limits the trophic levels in most of the ecosystem.    

6 0
2 years ago
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