Do you think there are concentration gradients? If so, for which ions are there concentration gradients? Specify whether the concentration values of these ions are higher or lower inside the cell.

A) Based on the drawings above, which molecules were able to diffuse through the 150 MWCO membrane? B) Which molecules(s) were not able to diffuse? Why not? C) Which side of the chamber had the greater osmolarity/osmotic pressure and how could you tell?

The following table depicts the rate of transport of a molecule into a cell as the external concentrations are changed. Based on what you know about the characteristics of membrane transport, the molecule is most likely transported by: a) passive transport b) simple diffusion across the membrane c) facilitated diffusion d) active transport

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 A

A cell creates a H+ gradient across a membrane- in other words, a situation is created were the concentration of H+ is higher on one side then the other of a membrane. How can this H+ concentration gradient be used to do work (that the cells needs to do)?

When a cell is placed in a solution with a very low solute concentration,water diffuses into the cell.Such a solution is called.... solute. Cell shrinking,also known as crenation,occurs a cell is placed into a(n)..... solution. The sodium-potassium pump moves. coupleted transport that involves the moving of one substance against its concentration gradient by using energy from a second substance moving down its concentration gradient is known as ... The release of neurotransmitter from a neuron is an example of.... The uptake of cholesterol into cells is an example of.... When a cell surrounds a large particle with pseudopodia and then engulfs it,the process is called... When a ligand binds to them,.... receptors directly phosphorylate enzymes within the cell.

Suppose that initially there are 100 Nat and 25 K+ ions inside the cell, near the sodium-potassium pump. After how many cycles is the number of Na ions the same as the number of Kions inside the cell? With the initial values for each type of ion provided above, how many ions of each type are in the cell? What is the total number of ions at this time? Show your work and explain.

Which of the following best describes a hypotonic solution? a-There is a higher concentration of solute outside the cell than inside the cell b-There is a lower concentration of solute outside the cell than inside the cell c-The solute concentration both inside and outside the cell is equal d-Through osmosis, water will enter the cell causing it to swell

A cheek cell is placed in a 0.5% sugar solution A. The 0.5% sugar solution is hypotonic/isotonic/hypertonic to the cells (select one and type your answer below).  Explain your choice! B. Describe in which direction you expect water to move in the question above (into the cell / no net movement/ out of the cell) (select one and type your response in the space below).Explain your answer. Include the percentages of solute and solvent in areas inside and outside of the cell and how you determine the direction of water movement from the percentages!

What is the independent variable of the experiment?