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).
Endocytosis is a cellular process where cells absorb molecules or substances from outside the cell by engulfing it with the cell membrane.This technique is critical to the survival of the cell, since most molecules important to the cell cannot normally pass through the cellâs hydrophobic plasma membrane.inocytosis. In this process, the cell membrane folds around the molecule or substance, and it is dissolved into the interior of the cell. Molecules such as proteins and other water-soluble substances are thus injested this way, which could not otherwise breach the cell membrane.