Using the figure above, indicate if each statement is true or false. The ions are moving against their concentration gradient. The ions are moving against the electrical gradient of the membrane. 1. True The ions are moving down their electrochemical 2. False gradient. The movement of these ions would not require an input of energy. >

Using the figure above, indicate if each statement is true or false. The ions are moving against their concentration gradient. The ions are moving against the electrical gradient of the membrane. 1. True The ions are moving down their electrochemical 2. False gradient. The movement of these ions would not require an input of energy. >

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter3: Cells And How They Work

Section: Chapter Questions

Problem 5SQ: The passive movement of a solute through a membrane protein down its concentration gradient is an...

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A concentration gradient affects the direction that solutes diffuse. Describe how molecules move with respect to concentration.
Which of the following is a true statement? Sphingolipids contain 2 hydrophobic, acyl chains Phospholipids contain 3 hydrophobic acyl chains Sphingolipids are completely no-polar, hydrophobic molecules The different types of phospholipids do not have different physical properties when in the membrane
In the Nernst equation [V = 62 log10 (Co / Ci)], the term Co represents: cell bio the intracellular concentration of calcium the extracellular concentration of potassium the extracellular concentration of sodium the intracellular concentration of potassium the membrane potential (in millivolts)
DO NOT COPY THE ANSWER FROM THE SAME QUESTION. Sassa, a biology professor, wanted to demonstrate to her students the applicability of a dialyzing membrane (DM) as a model for the cell membrane by enclosing an aqueous solution in a DM bag and immersing in a beaker containing a different solution. Substances available which are permeable to the DM include 0.02 M NaCl, 0.03 M glucose, and 0.01 M glucose. The only substance available which is completely impermeable to the DM is the 0.01 M lactose. Using the substances given and materials such as a beaker, stirring rod, and string, draw ONLY ONE set-up that can be demonstrated by Ms. Sassa that will satisfy ALL of the following conditions:a. No solute will exhibit a net diffusion out of the cell.b. Glucose will exhibit a net diffusion into the cell.c. NaCl will exhibit a zero net d. No net movement of lactose from the inside to outside of the cell. Make sure to label properly the substance inside the beaker and inside the DM bag.
Which of the following accurately represents the general ionic concentrations we tend to observe in the extracellular space, relative to the cytosol? High Na, Ca. Low K, Cl. High Na, Cl. Low K, Ca. High Na, Ca, Cl. Low K. Low Na, Ca, Cl. High K.
Which of the following positively-charged ions is about 10,000 times more concentrated outside the cell than inside (useful in muscle contraction, and in signal transduction of neurons)? bicarbonate chloride sodium calcium magnesium
Using the answer code on the right, indicate which membrane component is responsible for the function in question: 1. channel formation____________________________________ (a) lipid bilayer 2. barrier to passage of water- __________________ (b) proteins soluble substances ____________________________________ (c) carbohydrates 3. receptor sites 4. membrane fluidity 5. recognition of self 6. membrane-bound enzymes 7. structural boundary 8. carriers
The passive movement of a solute through a membrane protein down its concentration gradient is an example of _________. a. osmosis b. active transport c. endocytosis d. diffusion
A molecule that donates electrons becomes _________, and the one that accepts the electrons becomes ________ . a. reduced; oxidized c. oxidized; reduced b. ionic; electrified d. electrified; ionic
Which of the following positively-charged ions is about 10,000 times more concentrated outside the cell than inside (useful in muscle contraction, and in signal transduction of neurons)? bicarbonate chloride sodium calcium E. magnesium
A hypothetical cell has a higher concentration of sodium ions outside the cell than inside the cell but an equal amount of chloride outside the cell and inside the cell. Based on its electrochemical gradient, which direction would chloride ions move across the cell membrane?
How could membranes promote the movement of ions out of or into cells? How could membranes restrict the movement of ions out of or into cells?