Some organisms use uncommon amino acids in synthesizing specialized proteins. Homoserine and homocysteine (pictured) are used in metabolism as intermediates in the production of common amino acids. Some scientists believe that homoserine and homocysteine could be used in proteins. Which of these could function as an amino acid in proteins?

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

The annual earnings of a typical investor are $1,000,000 to $10,000,000. $100,000 to $500,000. $60,000 to $200,000. $40,000 to $80,000.

Aschool principal trying to find out if parents will buy new playground equipment shows digital leadership by