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- https://www.youtube.com/watch?v=_bPFKDdWlCg&feature=youtu.be – Na/K pump Answer the following question: How does the movement of three positive Na ions out of the cell and two positive K ions into the cell make the inside of the cell negative?CELL ENVIRONMENTS Fill in the following statement: Diffusion is the movement of molecules from_high_concentration to_low. concentration. is the diffusion of water. BEAKER #I The solution inside the beaker is: % water % salt The solution inside the cell is: 90 10 % water % salt 20% salt How will the water move? Into the cell or out of the cell? 10% salt How will the movement of water affect the cell? The cell O Water molecules This is a(n) solution.Which of the following Ca++ ion channels removes calcium ions from the cytoplasm of the cell? 1. voltage-gated Ca++ channels 2. Na+/Ca++ active transport pumps 3. Ca++ uniporter 4. Na+/Ca++ exchanger Group of answer choices (A) 1 and 2 (B) 1, 2, and 3 (C) 2 and 4 (D) 2, 3, and 4 (E) 3 and 4
- Calculate the free energy changes at 20°C for the transmembrane movement of Na and K ions using the conditions presented Figure 9.1. Assume the membrane potential is -70 mV. Use 3 significant figures. AG (Na) - AG (K) = kJ. mol ¹ kJ mol2 AWhich of the following takes place during phase N? +30 M N K -55 -70 Time Potassium ions move out of the cell Potassium ions move into the cell Sodium ions move into the cell Sodium ions move out of the cell Membrane potential (mV)The electrochemical gradient across the plasma membraneGroup of answer choices is caused by more sodium on the inside of the cell relative to the outside of the cell Contains stored potential energy that can be harvested by the cell is caused solely by the sodium/potassium ATPase is a form of kinetic energy that can be harvested by the cell All of the above
- Cell type B (transport protein mutant) Time IN [Na+] 0 10 ms 20 ms 150mM 40mM 40mM Is cellular energy required? (YES/NO) OUT [Na+] 15mM What powers this transport? (Diffusion/ATP) 125mM 125mM Is a membrane protein required? (YES/NO) Q4. Now, analyze a similar data set for cell type B above. Add an arrow labelled with 1° to indicated where primary active transport occurred. Add an arrow labelled with 2° to indicate where secondary active transport occurred (if it occurs). Q5. What is not occurring in Cell B (mutant) compared to Cell A (non mutant) ? Therefore, what do you conclude about the normal role of this transport protein? IN [ATP] 200mM 70mM 70mM Q6. Fill in this summary table to compare and contrast types of transport. For secondary you need to distinguish between the two parts. Simple diffusion IN [Glu] 5mM 5mM 5mM Facilitated diffusion OUT [Glu] 200mM 200mM 200mM Primary active transport Secondary active transportWhich of the following provides the most likely explanation for the limiting factor of a cell's size? A B с D As the cell size increases, its volume increases while its surface area does not. As the cell size increases, its volume increases at a faster rate than its surface area. As the cell size increases, its volume increases at a slower rate than its surface area. As the cell size increases, its surface area increases while its volume does not.A cell has a membrane potential of -100 mV (more negative inside than outside) and has 1,000 times more calcium ions outside the cell than inside. Which best describes a mechanism by which Ca2+ enters this cell? facilitated diffusion of Ca2+ into the cell down its electrochemical gradient movement of Ca2+ into the cell through an ion channel down its concentration gradient passive diffusion of Ca2+ into the cell down its electrochemical gradient cotransport of Ca2+ into the cell with Cl- movement of Ca2+ into the cell through a carrier protein down its electrical gradient I know that the answer is 1 but please explain why. Thank you.
- What is the free energy change for the transport of calcium ions (Ca++) across a membrane from a region (left) where the concentration is 50 micromolar to a region (right) where the concentration is 50 micromolar? A membrane potential of 60 mV exists across the membrane where the right side is more negative than the left side. The temperature is 25 C.Which of the following mechanism will be activated if there is a shortage of cellular and endoplasmic reticulum Ca2+ reserve? O DAG will activate protein kinase C to release calcium bound to calmodulin ER membrane protein STIM1 will activate plasma membrane Orail channel All of the other mechanisms will be activated IP3 signaling will release stored calcium from the ER DAG will activate protein kinase C to activate store operated calcium channel in the plasma membrane < Previous Next ▸The membrane of most cells, including neurons, contains passive, open, K' leak channels. Given the normal K' concentrations and the resultant concentration gradient, which direction would K' be expected to move (diffuse) through these leak channels? Select one: 1/into the cell 2/out of the cell