that many cells have polarity (as ionality, in this case). Consider the apical location a particular protein (A) expressed in epithelial cells, illustrated in the figure above. Which type of defect described below is the most likely to cause the redistribution of that protein around the entire cell? A) A nonfunctional enzyme glycosylase. B) The deletion of a junctional protein. C) The truncation of a protein found in the extracellular matrix. D) A nonfunctional flippase. Answer: Explanation: apical plasma membrane lateral plasma membrane basal plasma membrane basal lamina protein A tight junction

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Proteins

We generally tend to think of proteins only from a dietary lens, as a component of what we eat. However, they are among the most important and abundant organic macromolecules in the human body, with diverse structures and functions. Every cell contains thousands and thousands of proteins, each with specific functions. Some help in the formation of cellular membrane or walls, some help the cell to move, others act as messages or signals and flow seamlessly from one cell to another, carrying information.  

Protein Expression

The method by which living organisms synthesize proteins and further modify and regulate them is called protein expression. Protein expression plays a significant role in several types of research and is highly utilized in molecular biology, biochemistry, and protein research laboratories.