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Inga [223]
3 years ago
6

For the average u.s. resident, the single largest source of radiation exposure is

Biology
1 answer:
Gelneren [198K]3 years ago
8 0
Radon and Thoron are the most significant sources of radiation exposure to people living in the United States accounting for 37% of total radiation exposure.
These are nuclides that are produced from the radioactive decay of materials especially in consumer products and through natural processes such as the decay of radium.
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b. a semi-permeable double layer of phospholipids that have hydrophilic heads and hydrophobic tails

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The cell membrane also has a phospholipid bi-layer comprised of a double layer of phospholipids which have hydrophilic head and hydrophobic tails. This is because the heads are made of phosphate and are polar and are therefore attracted to water (hydrophilic), while the tails are made of lipids (i.e. fats, oils) which do not mix with water and are therefore hydrophobic.

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