<span>R group (or side chain) is an organic component of amino acids that is unique to each amino acid. </span> <span>Three of the amino acids have basic side chains at neutral pH: arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base and their pKa's are high enough that they tend to bind protons, (positive charge). Aspartic acid or aspartate (Asp) and glutamic acid or glutamate (Glu) are acidic amino acids because their side chains have carboxylic acid groups whose pKa's are low enough to lose protons, (negatively charged). The non-polar amino acids contain uncharged functional groups<span> at physiological pH and are incapable of participating in hydrogen bonding. </span></span>
A group of similar cells that perform a single function is called a tissue.
1. a) predation is when one organism is harmed and the other is benefited. An example of this is when a predator eats/hunts its prey - like a lion eating a lamb
b) commensalism is when one organism benefits from the other and the second organism is not affected. An example of this are the barnicles on a whale
c) symbiosis is the long-term interaction between two different biological organisms
d) parasitism is when one organism is harmed while the other is benefited
Answer:
Because of their brightness, how big they are, and how many their are
Explanation:
