Figure 1. Types of movement across membranes. Molecules can diffuse across a. membrane down a concentration gradient without the aid of a protein or the input of. energy. Passive and active transport require membrane transport proteins. Channel. proteins carry out passive transport, but carrier proteins can carry out passive or active. transport.
Akron, Iowa. Akron is a city in Plymouth County, Iowa, United States. The population was 1,486 at the 2010 census.
For Information on how to file your 2014 taxes click here. The City of Akron Income Tax Division collects and administers the Akron City Income Tax as well as the Income Tax for the following four Joint Economic Development Districts: 1  Bath â Fairlawn â Akron JEDD. 2  Copley â Akron JEDD. 3  Coventry â Akron JEDD.