The carbon atom has 2 electrons in its inner shell and 4 electrons in the outer shell.
Carbon is a chemical element with atomic number 6, and the symbol C. The word carbon comes from a Latin word carbo, which means coal.
Because of its willingness to form compounds more than any other element, it forms a larger number of compounds than any other element. It easily bonds with non-metallic elements and du to this, it is often termed as the building block of life.
Even though it forms many different compounds, relatively it is a non-reactive element
Answer:
Ligand-receptor interaction is the first interaction that triggers cell signalling.
Explanation:
Ligands are the hormones, drugs or neurotransmitters that specifically bind with receptors present in cell surface to initiate cell signalling. Ligand binding to the receptor is reversible. Binding of the ligand to the receptor can activate or inactivate receptor. Activation may lead to cell signalling pathways. Inside cells, there are secondary molecules which on activation starts a cascade of reactions. which in-turn regulate the function of the ligand molecule.
Best Choice:
Ligand-receptor interaction is the first interaction that triggers cell signalling.
A non-living system would be a machine, such as an electrical system, air conditioning, etc. and a living system would be an animal, person, plant, etc.
so if you look up things that can cause an asthma attack it will also show that viruses and bacteria are a cause. with asthma you lungs could already be inflamed as well as your air way wich makes it harder to breath. when you have c-19 it will inflame your lungs even more so it makes it even harder to breath given an asthma attack. more asthma attack now are probably caused by c-19 because it is all over the place and the percent of asthma attack by virus has dramatically increased.
Light pollution<span> is excessive and inappropriate artificial </span>light<span>. The four components of </span>light pollution<span>are often combined and may overlap: Urban Sky Glow—the brightening of the night sky over inhabited areas. </span>Light<span> Trespass—</span>light<span> falling where it is not intended, wanted, or needed.</span>
