Amino acids are the building blocks of proteins. there are 20 amino acids that most commonly occur in proteins. based on the functional group making up their side chain, or r group, amino acids are classified as acidic, basic, or neutral. the physical and chemical properties of the r group determine the unique characteristics of each amino acid.

During sunny hours, a large amount of build up between the hours of 1: 00-5: 00 pm. a. ozone b. mercury c. lead d. sulfuric acid

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

In the united states there are strict fishing seasons and limits, but not all countries enforce similar laws. in bangladesh there are few if any fishing restrictions. what might be the reason for less restrictions in smaller countries like bangladesh? a) the united states is the only country worried about overfishing. b) the united states wants to limit the supply of fish to increase the price. c) bangladesh and smaller countries have an unlimited supply of fish in their coastal waters. d) small countries, such as bangladesh, are practicing subsistence fishing, taking only the fish needed to survive.