Which of the following best explains why arginine is more basic than lysine?

a. the electron-donating groups around the basic nitrogen on arginine make its conjugate base less stable.
b. the electron-donating groups around the basic nitrogen on arginine make its conjugate acid more stable.
c. the lack of electron-donating groups on lysine make its conjugate acid more stable.
d. the lack of electron-withdrawing groups on lysine make its conjugate base more stable.

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.