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Amiraneli [1.4K]
3 years ago
7

The cell theory teaches that _____.

Biology
2 answers:
hodyreva [135]3 years ago
5 0

That cells are the basic units of life, and also the smales living organisms.

Though the two above are the main concepts, you can also find more complex things thought by the cell theory.


Hope it helped,


BioTeacher101

Rasek [7]3 years ago
3 0

the basic unit of life is the cell

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The important point is that the surface area to the volume ratio gets smaller as the cell gets larger.

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In the terrestrial food web above, what would be the effect of a farmer introducing a rat poison in to the ecosystem that is tox
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As explained below

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Briefly describe how amniocentesis and chorionic villi sampling are used in genetic screening.
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Amniocentesis is an invasive method that involves the aspiration of 10-20 ml of fetal water through the abdominal wall under ultrasound-guided control. In most cases, the procedure is performed around the 16th week of gestation. The fetal water sample contains fetal cells, mostly cells of fetal skin and the epithelium of the urinary tract.

Chorionic Villus Sampling (CVS) biopsy is performed between weeks 11 and 12 of gestation. During biopsy, with ultrasound guidance, the tissue of the chorionic fossa is aspirated mainly across the abdomen (transabdominal pathway). The biopsy specimen is of fetal origin and belongs to the outer layer of blastocyst cells or the trophoblast (outer layer of the placenta). Very often, the biopsy specimen contains tissue of the decidua (mucous membrane of the uterus) that is of maternal origin, and it is necessary to remove the maternal tissue before any treatment of the sample.

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The advantage of chorionic biopsy is the amount of biological material, which is sufficient for the whole a number of different laboratory procedures. Also, a great advantage is the timing of the procedure as it allows diagnosis in the first trimester of pregnancy, but the chorionic biopsy procedure itself carries a risk of miscarriage of 1-2%.

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