29. What is the action of the Na/K pump? A. It is bidirectional for both ions B. It actively transports K+ out and Na+ into the cell C. It actively transports Na+ out and K+ into the cell D. It co-transports Na+ and K+ into the cell 30. Which of the following statement about plasma membranes is correct? A. The plasma membrane is impermeable to all molecules B. There is an asymmetrical distribution of phospholipids and glycolipids C. The phospholipid bilayer is entirely hydrophobic D. The plasma membrane is impermeable to water

29. What is the action of the Na/K pump? A. It is bidirectional for both ions B. It actively transports K+ out and Na+ into the cell C. It actively transports Na+ out and K+ into the cell D. It co-transports Na+ and K+ into the cell 30. Which of the following statement about plasma membranes is correct? A. The plasma membrane is impermeable to all molecules B. There is an asymmetrical distribution of phospholipids and glycolipids C. The phospholipid bilayer is entirely hydrophobic D. The plasma membrane is impermeable to water

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter5: Membranes And Transport

Section: Chapter Questions

Problem 4TYK: A characteristic of carrier molecules in a primary active transport pump is that: a. they cannot...

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A characteristic of carrier molecules in a primary active transport pump is that: a. they cannot transport a substance and also hydrolyze ATP. b. they retain their same shape as they perform different roles. c. their primary role is to move negatively charged ions across membrances. d. they move Na+ into a neural cell and K+ out of the same cell. e. they act to establish an electrochemical gradient.
Water moves via osmosis _______. a. throughout the cytoplasm b. from an area with a high concentration of other solutes to a lower one c. from an area with a low concentration of solutes to an area with a higher one d. from an area with a low concentration of water to one of higher concentration
A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with one from the Mojave Desert. Which hypothesis is most likely to be correct? The cells from the Mediterranean coast animal will have more fluid plasma membranes The cells from the Mojave Desert animal will have a higher cholesterol concentration in the plasma membranes The cells’ plasma membranes will be indistinguishable The cells from the Mediterranean coast animal will have a higher glycoprotein content, while the cells from the Mojave Desert animal will have a higher lipoprotein content.
8. Which of the following ion transport functions must be carried out by a pump? a. transport of Na+ from the extracellular space to the cytosol b. transport of glucose from the extracellular space to the cytosol c. transport of K+ from the cytosol to the extracellular space d. transport of Na+ from the cytosol to the nucleus e. transport of Na+ from the cytosol to the extracellular space.
1) a) Draw arrows to indicate which direction Na+ vs K+ions will tend to move.(into vsout of the cell) b) What prevents these solutes from diffusing across the membrane at a significant rate? c)If the solutes were unable to move across the membrane, would the cell be considered hypertonic, hypotonic or isotonic? d) If the solutes were unable to move across the membrane, which way would water move?(inside the cell, outside the cell or no net movement) e) How did the cell establish the differential in the shown ion concentrations in the first place?
Among the membrane transporters, the channels require energy and therefore are involved in active transport. * D. Disagree, because channels are not proteins and therefore are not involved in active tranport. A. Agree, because channels are associated with H+-ATPase. B. Disagree, because the pumps are the ones involved in active transport. C. Agree, because channels are proteins involved in active transport.
1. When all the protein carriers are used up, the carriers are said to be A. Adapted B. Unsaturated C. Saturated D. Consumed 2. The proteins that constantly transport sodium ions outside the membrane is called A. Membrane pump B. Calcium-potassium pump C. Sodium-potassium pump D. Glucose-potassium pump E. Protein-potassium pump 3. The process in the question above gets its energy from A. ADP B. ACT C. PTA D. ATP E. TPA
5. All of the following membrane activities require ATP energy except? a. facilitated diffusion b. active transport c. sodium ions moving out of the cell d. protons pumps e. translocation of potassium into a cell
9)Two solutions are separated by a selectively permeable membrane that is not permeable to glucose. On one side of the membrane, solution A contains 10 percent glucose and on the other side, solution B contains 25 percent glucose. Which of the following is true? Select one: a. Solution A is hypertonic. b. The solutions are isotonic. c. Water would move from solution A to solution B. d. Glucose would move from solution B to solution A.
Na+ moves from high to low concentration, across the plasma membrane, through a protein channel that is permenantly open. Which statement is true about this process? a. It does not require ATP b. It is a form of active transport c. Movement is against the concentration gradient of Na+ d. The channel probably allows many different molecules and ions to cross
The proteins that constantly transport sodium ions outside the membrane is called A. Membrane pump B. Calcium-potassium pump C. Sodium-potassium pump D. Glucose-potassium pump E. Protein-potassium pump The process in the question above gets its energy from A. ADP B. ACT C. PTA D. ATP E. TPA
A dehydrated runner drinks a lot of water after a race. His cells become rehydrated after drinking water because (a) The bloodstream is hypotonic compared to the contents of the digestive tract. (b) The contents of the digestive tract are hypotonic to the bloodstream. (c) The contents of the bloodstream and digestive tract are isotonic to each other. (d) Water will diffuse from a low concentration to a high concentration. (e) The contents of the digestive tract are hypertonic to the bloodstream. Explain your answer