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Order the membrane models by date

Exercise and reference answers

Steps
  1. 1935: railroad track model
  2. 1950s: TEM shows two layers
  3. Singer and Nicolson propose
  4. Fluid mosaic model accepted
Instructions
Tap the steps in the order the science actually happened.

Explanation

_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_
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