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.
Management of this profile. If you work at Akron Fire Department and have the authority to update fire dept. info, you can apply to manage this profile. To find additional fire departments in your region please use the following links: Akron, IA Fire Departments Â» Plymouth County, IA Fire Departments Â» Iowa Fire Departments.