[Membrane Proteins] Based on the figure provided, What classification best describes G-proteins? Light Cytosol Disk membrane Disk lumen 3 PDE 4 PDE Rod GBY Inactive Active plasma membrane R R* 5 CGMP GMP 6 PDE PDE Low cytosolic CGMP (•) Na* Ca2+ Inactive Active Closed CGMP-gated ion channel (less neurotransmitter released) G RGS9 GB5 High Dark-adapted cytosolic CGMP (•) RGS9 state GB5 Na* Ca2+ Open CGMP-gated ion channel (more neurotransmitter released) Lodish et al. (2016), Molecular Biology of the Cell, 8th Edition, Chapter 15 Integral Membrane Proteins O Peripheral Membrane Proteins O Lipid-Anchored Proteins O Soluble Cytosolic Proteins OTP

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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.