Explain the difference between passive, facilitated, active, and coupled transport of how small molecules pass through the membrane. Why is it important that some molecules diffuse freely across the membrane? Explain how signal molecules binding to a membrane receptor can elicit a cellular re...
water loving" heads are on the outside, any substance that is water-based (as opposed to fat- or oil-based) can pass through. However, the particles must be small enough to pass through, or diffuse, through the membrane. Particles that a...
Why are polar molecules not able to pass through the cell membrane? Why do cells need to use transport proteins to function? How do phospholipid molecules lead to compartmentalization of a cell? How are the proteins used for active transport different from those used for facilitated diffusion?
How Does a Membrane Protein Achieve a Vectorial Proton Transfer Via Water Molecules? Chemphyschem 2008;9(18):2772-2778.S. Wolf, E. Freier, K. Gerwert, How does a membrane protein achieve a vectorial proton transfer via water molecules? Chemphyschem 9 (2008) 2772-2778....
Introduction: Cells, the smallest functional unit in an organism, contain several organelles and carry out functions of life. The cell membrane is an organelle that holds thecell’s contents, and it allows for certain molecules to pass through, which is why it is referred to as selectively per...
Clay ceramic filters work in a fashion similar to the desalination technology described in the previous section. Basically, water flows through clay that contains a lot of really tiny holes, which are big enough to let water molecules though, but too small for biological contaminants, dirt, and...
The centerpiece of an IF experiment is a combination of two different components: Specific antibodies, which are used to form an immune complex to mark the desired molecules – in most cases proteins – in the cell. Fluorochromes, which are coupled to the immune complexes and therefore visualiz...
One of the main Ca2+ influx routes in cells is represented by store-operated Ca2+ entry (SOCE). SOCE is mediated by a functional interaction between STIM1 Ca2+ sensor of endoplasmic reticulum and ORAI1, a Ca2+-release activated Ca2+ (CRAC) channel of the plasma membrane [38] and is ...
What molecules can diffuse through the plasma membrane? How do materials move across the cell membrane? How does oxygen pass through the cell membrane? In reference to photosynthesis, explain the consequence of increasing the chloroplast inner membrane permeability that allows the diffusion of small ch...
How are large molecules transported across a cell membrane? How does water move across the cell membrane? Discuss how are cells able to transport large molecules. Can a water-soluble molecule, a small fat soluble molecule and a small charged ion pass directly through a cell membr...