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Short answer Facilitated diffusion is a passive process in which membrane channels mediate the transport of polar, or big molecules that are not solvable in the cell membrane. Co-transport, on the other hand, is active transport, as it depends on the electrochemical gradient of ions across the cell's membrane, particularly Na+. Because ATP or other energetic ...


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"Specifically, what is the difference between facilitated diffusion carrier processes (passive) and secondary active transport co-transport processes (active)?" Facilitated diffusion creates alternative paths for polar/charged substances to move down their electrochemical gradients across the hydrophobic interior of the membrane, thus greatly speeding up ...


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Cyanidioschyzon merolae seems to be an example of such algae. Cryptomonad, aka Cryptophyceae also lacks cell wall. I think, problem you encounter is that most studies are concerned with structure and function of cell walls, as such knowledge can be used in biotech industry. Hence, you will not find answer by looking for "algae without cell wall". As a ...


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Great question. Turns out, there is some information about it. For example, consider following resource: Membrane Protein Lipid Composition Atlas. Published by University of Michigan, it provides information on, primarily, protein content of different membranes from different species, but also has a list of lipid content. Just as an example, consider ...


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There is one main reason: Amplification of the signal. You can start a signal downwards the cascade with relatively few receptors which need to be activated which allows even for weak signals to be translated into the nucleus. This figure shows this for G protein coupled receptors (from here): For example one molecule of cAMP can activate many molecules ...


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No, plasma membrane does not contain any nucleic acids – DNA and RNA. The main components of plasma membrane are lipids, glycol- lipids, phospho lipid bilayer and cholesterol.


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Membrane potential The membrane potential in cells can be determined by the distribution of lipophilic ionic molecules between the cells and the suspending medium according to the Nernst equation: Where: ∆ ψ is Membrane potential, R is the gas constant (in J K−1), n is the number of electrons per mole, F is the Faraday constant (in C mol−1), [X]i ...


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Nucleic acids are not structural components of cell membranes (ribosomes and nucleus are the main places where they are found). However, being open system, cell exchanges chemicals with its surrounding and cellular membrane can transport nucleic acids as well. This is why these acids can potentially be detected in the cell membranes. If you have the exact ...



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