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.
Akron is the fifth-largest city in the U.S. state of Ohio and is the county seat of Summit County. It is located on the western edge of the Glaciated Allegheny Plateau, approximately 39 miles south of Lake Erie. As of the 2015 Census Estimate, the city proper had a total population of 197,542, making it the 119th largest city in the United States. The Akron, OH Metropolitan Statistical Area covers Summit and Portage counties, and in 2010 had a population of 703,200. It is also part of the larger