As an undergraduate research assistant, you are assisting with a radioisotope tracer experiment. You expose a mature leaf on one side of the lower shoot of a sugar beet plant to 14CO2 and then track the movement of the 14C atoms by radiography. Where are you LEAST likely to detect 14C?

a. the roots
b. the treated leaf
c. a mature upper leaf on the opposite side of the plant from the treated leaf
d. the shoot apical meristem

Explanation:  

C-14 is an isotope of Carbon that is radioactive in nature and used for various purposes in the research and some other fields.

It is used in carbon dating, carbon labeling, and some other way.

As carbon labeling, it has may important in the detection of biochemical reactions.

Since the mature upper leaf part are away from the treated parts so the least amount of C14 is detected in such a portion.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.