Polarity affects hydrogen bonding because hydrogen bonding occurs due to a bond being polar. One side of the bond will be slightly more negative because it's pulling more electrons towards itself and the other side of the bond will be more positive. Therefore the partially positive bond of one molecule will be attracted to the partially negative bond of another molecule. This is called an intermolecular force and hydrogen bonds are the strongest intermolecular force.
This mechanism allows killer T-cells to hunt down and destroy cells that are infected with germs or that have become cancerous.
The other main type of T-cells are called helper T-cells.
Helper T-cells orchestrate an immune response and play important roles in all arms of immunity.
Explanation:
Science is the systematic and methodical way of thinking about our natural world.
- The bedrock of engineering is science.
- Engineering is simply the application of scientific principles.
- We can picture engineering as a practical science.
- All technologies innovated by engineers are based on simple scientific deductions.
- A good background of the science makes engineering easy to conceptualize.
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B. Halons............................
