Transport Across a Cell Membrane. The cell membrane is one of the great multi-taskers of biology. It provides structure for the cell, protects cytosolic contents from the environment, and allows cells to act as specialized units.
How to Amend the Constitution. Article V of the United States Constitution provides authority and instructions for amending the Constitution. Amendments can be proposed by Congress or by constitutional convention. Congress then decides how to ratify the amendment if approved by Congress or convention.
Article Five of the United States Constitution prescribes two methods for proposing and two methods for the ratification of an amendment. An amendment may be proposed by a two-thirds vote of both the House of Representatives and the Senate or by a national convention called by Congress at the request of two-thirds of the state legislatures. The latter procedure has never been used.