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.
From Wikipedia, the free encyclopedia. Olmsted Township is a township located in Cuyahoga County, Ohio, United States. Situated in the southwest end of the county, Olmsted Township is a west side suburb of Cleveland, and a part of the even larger Greater Cleveland area. As of the 2010 Census, Olmsted had a population of 13,513. It is one of only two civil townships remaining in Cuyahoga County, and the only Olmsted Township statewide.