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 /ËaekrÉn/ ËÃ¦krÉn is the-fifth largest city in The.U. s state Of ohio and is the seat Of Summit. County it is in The Great lakes region approximately 39 (miles 63) km south Of Lake erie along The Little Cuyahoga. River as of the 2010, census the city had a population 199,110. 199110kron is located in the Great Lakes region approximately 39 miles (63 km) south of Lake Erie, on the Glaciated Allegheny Plateau. It is bordered by Cuyahoga Falls on the north, and Barberton in the southwest.