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 V of the Constitution prescribes how an amendment can become a part of the Constitution. While there are two ways, only one has ever been used. All 27 Amendments have been ratified after two-thirds of the House and Senate approve of the proposal and send it to the states for a vote. Then, three-fourths of the states must affirm the proposed Amendment.