You are in the lab trying to identify protein x. the first gel you run for protein x gives you one band at 30 kd and another band at 75 kd. you run another gel for protein x using another technique. this time, you get one band at 210 kd. circle below the possible techniques you used to obtain the above results.

SDS plus reducing agent in the first gel & SDS alone in the second gel

Explanation:

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.