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, MI. Akron is located in southeast Michigan. Akron is part of Tuscola County. Akron has 0.94 square miles of land area and has no water area. As of 2010-2014, the total Akron population is 397, which has shrunk 13.88% since 2000.