The perspective formula of threonine, an amino acid with two asymmetric centers, is provided below. perspective formula of threonine add either an h, oh, or nh2 group to complete the fischer projection for threonine.

Essay-alternative energy sources research sources of energy that are being developed. write a report of 350-400 words discussing the information you learned concerning the development of various energy sources and the impact that you think they will have on your life. include sources cited at the end of your report using the mla format. follow the rubric guidelines. note that wikipedia is not an appropriate resource for a research paper. worth 99

Why does ammonia, nh3, behave as a base when it reacts with an acid? z

Agust of wind blowing east pushes against a ball. when will the wind do work on the ball? when the ball moves to the east when the ball moves to the north when the ball stays in one place when the ball moves north or south