Receptors often activate signaling molecules that are __________. This property helps to increase signaling efficiency of this pathway. bound to the plasma membrane floating in the cytosol locked in the endoplasmic reticulum inside the mitochondria all of the above

Model 3: Facilitated Diffusion Area shown in more detail Glucose xml Gated channel Hormones Hormone binding site 18. Which part of the cell membrane is shown in more detail in Model 3? 19. What is the gap between the proteins called? 20. What type of molecules attach to the protein?

Cell-cell recognition occurs because _____ is secreted from the cell and is attached to the external phospholipids

AAA is a protein found in both the cytosol as well as the nucleus. In its active state, it helps to facilitate the movement of proteins into and out of the nucleus. Specifically, AAA-alpha and AAA-beta binds to receptors on the nucleus and allows for materials to enter or exit through the channels associated with the receptors. They also play a role in dropping off cargo that import and export receptors hold onto. AAA functions are controlled by two other proteins: BBB and CCC. BBB binds onto AAA, while CCC removes BBB from AAA when they are bound. As a result, there is a BBB and CCC concentration gradient that forms between the cytosol and nucleus. During prophase I, is there a concentration gradient for BBB and CCC between the cytosol and the nucleus? Why? Is this also the case during the other phases of meiosis or the cell cycle?

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The plasma membrane has a hydrophobic interior due to the two present in each phospholipid found in the phospholipid bilayer of the cell membrane. The plasma membrane allows some molecules to cross but not all. Therefore, the plasma membrane is said to be Molecules that are nonpolar and hydrophobic will cross the membrane with ease by Does this process require energy? When molecules move across the plasma membrane by passive transport, they will move down or with the_ from an area of concentration to an area of. concentration. Polar, hydrophilic molecules and charged ions will move across the plasma membrane by the process of_ This does not require energy, but it does require a A special case of diffusion is known as which is the movement of water across the plasma membrane. If a cell is placed into a solution that is hypertonic compared to the inside of the cell, the cell would If a cell is placed into a hypotonic solution compared to the inside of the cell, the cell water. would…

Cholesterol has which of the following effects on the plasma membrane of an animal cell? it makes the membrane more rigid at low temperatures, and more fluid at high temperatures it makes the membrane more rigid at both low temperatures and high temperatures it makes the membrane more fluid at high temperatures, and more rigid at low temperatures it makes the membrane more fluid at both high temperatures and low temperatures it makes the membrane more fluid at low temperatures, and more rigid at high temperatures

Scaffolding proteins can hold together can permanently hold together signalling pathways.   Question 20 options:   True   False

A very small, uncharged molecule passes easily through the cell membrane.Which of these statements is the most likely explanation?     the cell is expending energy to do this   a protein carrier must be at work   the cell membrane is mostly composed of liquid lipid molecules   phagocytosis has enclosed this molecule in a vacuole

Which is the definition of 'retrograde' with respect to membrane trafficking?     movement from the endosome to the lysosome     movement from the ER to the Golgi to either the plasma membrane or the endosome/lysosome     movement from the cytoplasm to the nucleus     movement from the Golgi to the ER