How to prepare for your annual encounter with confusion. Daylight Saving Time ends Sunday at 2 a.m., which means that weâre all going to spend a few minutes scratching our heads trying to figure out whether weâre gaining or losing an hour of sleep. Save yourself the trouble and let TIME break it down for you.
For example, plasma membrane proteins carry out functions as diverse as ferrying nutrients across the plasma membrane, receiving chemical signals from outside the cell, translating chemical signals into intracellular action, and sometimes anchoring the cell in a particular location (Figure 4).
Quick Answer. Active transport is important for cellular function because it moves important items, such as calcium and glucose, into and out of cells. Proteins sit on the cell membrane, with one part inside and one part outside the membrane. If these items don't cross the membrane, the cell can die. Continue Reading