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 a city in the U.S. state of Ohio and the county seat of Summit County. The municipality is located in northeastern Ohio on the Cuyahoga River between Cleveland to the north and Canton to the south, approximately 60 miles (96 km) west of the Pennsylvania border.