What does hypertonic mean? * Your answer You are trying to see if a channel transports a specific ion across a cell membrane. How would you test this? Your answer Why aren't ion channels open all the time? * Your answer If a protein uses active transport to drive one molecule into a cell and one molecule out of the cell it is called Symporter Antiporter Uniporter

What does hypertonic mean? * Your answer You are trying to see if a channel transports a specific ion across a cell membrane. How would you test this? Your answer Why aren't ion channels open all the time? * Your answer If a protein uses active transport to drive one molecule into a cell and one molecule out of the cell it is called Symporter Antiporter Uniporter

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 1TAHL: Which of the following methods of transport is being used to transfer the substance into the cell in...

See similar textbooks

Similar questions

Cells transporting substances across their membranes is essential. Choose TWO of the following types of cellular transport. ๏osmosis ๏active transport ๏facilitated diffusion ๏endocytosis / exocytosis (a)For each type of transport you choose, describe the transport process. Explain how the organization of cell membrane plays a role the movement of specific molecules across membrane. (b)Using the same transport types, identify a specific cell that utilizes that type of transit (i.e. one cell for each transport type, or two different cell examples), and detail a substance that is transferred. (c)A typical human lymphocyte has a radius of about 10 μm, while a typical bacterium (e.g., S. pneumoniae) has a radius of about 1 μm. Assuming that both cell types are perfectly spherical, compare and contrastthe transport mechanisms for each of these cells.
How is active transport different from simple diffusion? Both active transport and simple diffusion transport molecules against the concentration gradient. In active transport, molecules are moved down the concentration gradient; on the B contrary, molecules to be transported in simple diffusion are moved against the concentration gradient. In active transport, molecules are transported with the aid of transport proteins; on the © other hand, molecules to be transported in simple diffusion do not need transport proteins. In active transport, molecules that are transported does not need metabolic energy; in contrast, molecules transported in simple diffusion need metabolic energy.
Aldosterone is a steroid hormone that freely enters the target cells to act within the cell. Epinephrine is a polar monoamine (amino acid) hormone that interacts with receptors on the cell's surface. What accounts for this difference? [Select any/all that apply.] Steroids are charged and hydrophilic, so aldosterone passed through a transport protein. Steroids are hydrophobic so aldosterone passed through the membrane by simple diffusion. Epinepherine (amino acid) hormone is hydrophilic, so it cannot diffuse through the phospholipid bilayer. Epinepherine (amino acid) hormone could diffuse through the phospholipid bilayer but it is attracted to the receptor protein.
At this point, go over your answers to the activit ies given earlier in this lesson before you fill out the table below. Table 20: Interdependence of Function and Fom in the Cell Membrane Which components of the cell membrane enable it to perform this function? Function of the Cell Membrane How do these components help the cell membrane in performing this function? iully control the passage of substances through its membrane. However, all activit ort, involve energy. This leads us to another characte As stated in the first section of this lesson, maintaining homeostasis requires ise this in powering
What would happen in each of the following cases where something related to intracellular transport is altered? Assume in each case that the protein involved is a soluble protein, not a membrane protein. State where each protein would be located and explain each of your answers. You add a signal sequence (for the Golgi) to the N-terminal end of a normally cytosolic protein. You change the hydrophobic amino acids in an ER signal sequence into other, hydrophobic, amino acids.
Provide an example of how multiple membrane transport proteins typically work together to move a molecule across a membrane (your example can be general or use hypothetical proteins).
Look carefully at the transmembrane proteins shown in Figure 11–29. What can you say about their mobility in the membrane?
Drawn below is a schematic of a transmembrane protein. Extracellular Cell membrane Cytosolic side (a) From the list below, select the amino acid(s) that might by more common in the extracellular domain of this membrane protein and whose side- chain can form hydrogen bonds with the surrounding water molecules. Explain why you selected this option(s). Lysine Serine Phenylalanine Methionine (b) From the list below, select the amino acid(s) that would likely be found in the transmembrane/ membrane spanning domain of this protein and whose side- chain interacts with the lipid bilayer. Lysine Serine Phenylalanine Methionine
You will create a hand drawn, 2-dimensional, labelled diagram of the plasma membrane (not a 3D diagram). Label the following structures in your diagram: A phospholipid A peripheral protein An integral protein A cholesterol Intracellular and extracellular portion of the membrane Hydrophobic and hydrophilic areas Also include a detailed drawing of a single phospholipid labeling its component
For each of the following scenarios described where a molecule or ion is moving from one side of a membrane to the other, select the method by which the molecule or ion is moving. Each answer can be used more than once, or not at all. - Simple Diffusion - Facilitated diffusion by a channel protein - Facilitated diffusion by a carrier/transport protein - Active transport by a pump - Could be facilitated diffusion by a channel or a carrier; not enough information is given A- While water can freely diffuse across the membrane, it does not do so fast enough for living organisms to function properly. Therefore, membrane proteins known as aquaporins can increase the rate at which water moves across the membrane. The movement of water across the membrane via aquaporins (which do not change shape) is an example of which type of transport? B-Many snake venoms induce paralysis by acting on acetylcholine receptors. Nicotinic acetylcholine receptors are transmembrane proteins that allow Na+, K+…
The comparison of the simple diffusion, facilitated diffusion and active transport are shown in the table below: * Which comparisons are TRUE? Simple Diffusion Facilitated Diffusion Active Transport I Require ATP Does not require ATP Require ATP II Does not involve a Involve a transport Involve a transport transport protein protein protein From a region of higher III From a region of higher concentrațion of substance to a region of lower concentration of From a region of lower concentration of concentration of substance to a region of lower concentration of substance. substance to a region of higher concentration of substance. substance. O I and II only I and III only O Il and III only O I, Il and III
During an investigation on membrane transport, a researcher exposed bacterial cells to different concentrations of two different solutes: A and B. The rate of transport of each solute into cells isrepresented in the graphSolute ASolute BSolute ConcentrationWhich of the following best explains the greater rate of transport for solute A than for solute B at higher solute concentrations?A Solute A is being transported by simple diffusion, which does not rely on membrane proteins to control the rate of transportSolute A is being transported by active transport, which uses ATP and has higher rates of transport than passive transportSolute A is being transported by facilitated diffusion, which uses membrane proteins to increase the rate of transportRate of Transport