Plant cells use the sugar molecules produced by photosynthesis for two purposes. Some of the sugar molecules are used to synthesize other organic molecules like amino acids and cellulose so the plant can grow. Other sugar molecules and oxygen are used for to make which provides the energy for many biological processes.

Ateacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. the teacher explains that the string is what makes the ball go in a circle. why is the string necessary? a) the string is needed to apply a torque to the ball. b) the string is needed to push on the ball to get it up to speed. c) circle motion requires an inertia which is provided by the string. d) circle motion requires a force to give it a centripetal acceleratio