Homework Answers
a). Potassium ion (K+)
b). Sodium ion (Na+)
Passive transport of molecules is independent of energy requirement, and the transport or diffusion of molecule across the channel is facilitated by the concentration gradient. Channels are the protienious structures that allow the influx and efflux of molecules across them according to the concentration gradient.
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Which of the following molecules would be most likely to cross the cell membrane without assistance...
Which of the following molecules would require a transport protein to cross the membrane? A. Carbon...
Which of the following molecules would require a transport protein to cross the membrane? A. Carbon Dioxide B. Oxygen C. Glucose D. A&B E. All of the above What is energy coupling? A. An enzyme reducing activation energy B. The hydrolysis of ATP to ADP and inorganic phosphate C. The use of energy released from an exergonic reaction to power an endergonic reaction D. All of the above are examples of energy coupling Peroxisomes A.Contains enzyme to produce hydrogen peroxide...
B3. Cell Membrane and Cell Transport a) What kind of solution should a cell be placed...
B3. Cell Membrane and Cell Transport a) What kind of solution should a cell be placed in for it to become lysed? [1 mark] b) Give an example of a transmembrane protein. [1 mark] c) Which form of membrane transport does NOT require the expenditure of energy by the cell? [1 Mark] d) Given a cell with concentration of solutes in the environment lesser than the concentration of solutes in the surrounding fluid.. i. the extracellular fluid is said to...
33) Which of the following is most likely true of a protein that cotransports glucose and...
33) Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal? A) Sodium and glucose bind to the same site on the cotransporter. B) Transport of glucose against its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient. C) Sodium ions can be transported whether or not glucose is present outside the cell, but glucose transport requires cotransport of sodium ions. D)...
Question 1 Which of the following are likely to diffuse through the plasma membrane? glucose K+...
Question 1 Which of the following are likely to diffuse through the plasma membrane? glucose K+ Cl- H20 Na+ CO2 02 lipid Question 4 Which is(are) true about transport across the membrane? Channels can perform either active or passive transport Charged molecules move according to their electrochemical gradients Movement of an ion down its gradient requires energy Transporters are faster but less selective than channels Question 6 In the coupled transport of Na+ and glucose, the transporter O is an...
1. How does the cell membrane affect homeostasis (i.e., actively maintaining a stable internal en...
1. How does the cell membrane affect homeostasis (i.e., actively maintaining a stable internal environment) in the cell? (select ALL accurate statements) A) the cell membrane prevents charged ions, and (most) large, polar molecules from entering B) the cell membrane allows some molecules to enter freely C) the cell membrane prevents nonpolar molecules from entering the cell D) the cell membrane is a selective barrier 2. The cell plasma membrane has integral and peripheral proteins in the phospholipid bilayer. These...
9. Some diseases result from defective transport across the membrane. For example, cystic fibrosis results when...
9. Some diseases result from defective transport across the membrane. For example, cystic fibrosis results when a chloride ion transporter does not function. Which of the following is affected when this transporter does NOT function? the electrical gradient of the cell neither the chloride gradient nor the electrical gradient of the cell the chloride concentration gradient both the chloride concentration gradient and the electrical gradient of the cell 10. Which way does the water move if the cell is in...
Considering that the Nat-K+ ATPase membrane protein is essential for maintaining an electrochemical gradient across cell...
Considering that the Nat-K+ ATPase membrane protein is essential for maintaining an electrochemical gradient across cell membranes, which of the following is likely not a component of an electrolyte solution for treating dehydration? Choose one: O Ο Α. ΑΤΡ B. potassium o C. glucose • D. sodium
7.Which of the following can prompt an electrically gated ion channel in the cell membrane to...
7.Which of the following can prompt an electrically gated ion channel in the cell membrane to open? a)one additional ion entering the cell b)one ion leaving the cell c)activity of the sodium-potassium pump d)a change in the electrical potential of the membrane 10. If you have ever awoken from sleep to scribble down a brilliant idea, you can probably relate to Loewi, whose own sleep was interrupted with notes with an insight about ______. a) action potential speed b) chemical...
Question 3-6 points (a) Calculate the electric field in a cell membrane with a thickness of...
Question 3-6 points (a) Calculate the electric field in a cell membrane with a thickness of 8nm when the membrane potential is-70 mV. (2 points) (b) If a Sodium ion, Na, moves from inside the cell to outside the cell, calculate the change in the ion's electric potential energy. Does it increase or decrease? (2 Points) (e) In one cycle the sodium-potassium pump removes 3 sodium ions from the cell while importing 2 potassium ions, K. What is the total...
09. Which of the followine statements regarding channel proteins (shown below (shown below) is for propratic...
09. Which of the followine statements regarding channel proteins (shown below (shown below) is for propratic of all a. Channel proteins can assist polar molecules to cross the plasma membrane by facilitated diffusion b. The gated ion channel can allow ions to pass when stimulated to open. c. The surface of a channel protein in contact with the bilayer would likely have hydrophilic amino acids d. Water plays a role in determining which ions are allowed to pass through an...
Which of the following molecules would require a transport protein to cross the membrane? A. Carbon Dioxide B. Oxygen C. Glucose D. A&B E. All of the above What is energy coupling? A. An enzyme reducing activation energy B. The hydrolysis of ATP to ADP and inorganic phosphate C. The use of energy released from an exergonic reaction to power an endergonic reaction D. All of the above are examples of energy coupling Peroxisomes A.Contains enzyme to produce hydrogen peroxide...
B3. Cell Membrane and Cell Transport a) What kind of solution should a cell be placed in for it to become lysed? [1 mark] b) Give an example of a transmembrane protein. [1 mark] c) Which form of membrane transport does NOT require the expenditure of energy by the cell? [1 Mark] d) Given a cell with concentration of solutes in the environment lesser than the concentration of solutes in the surrounding fluid.. i. the extracellular fluid is said to...
33) Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal? A) Sodium and glucose bind to the same site on the cotransporter. B) Transport of glucose against its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient. C) Sodium ions can be transported whether or not glucose is present outside the cell, but glucose transport requires cotransport of sodium ions. D)...
Question 1 Which of the following are likely to diffuse through the plasma membrane? glucose K+ Cl- H20 Na+ CO2 02 lipid Question 4 Which is(are) true about transport across the membrane? Channels can perform either active or passive transport Charged molecules move according to their electrochemical gradients Movement of an ion down its gradient requires energy Transporters are faster but less selective than channels Question 6 In the coupled transport of Na+ and glucose, the transporter O is an...
Considering that the Nat-K+ ATPase membrane protein is essential for maintaining an electrochemical gradient across cell membranes, which of the following is likely not a component of an electrolyte solution for treating dehydration? Choose one: O Ο Α. ΑΤΡ B. potassium o C. glucose • D. sodium
Question 3-6 points (a) Calculate the electric field in a cell membrane with a thickness of 8nm when the membrane potential is-70 mV. (2 points) (b) If a Sodium ion, Na, moves from inside the cell to outside the cell, calculate the change in the ion's electric potential energy. Does it increase or decrease? (2 Points) (e) In one cycle the sodium-potassium pump removes 3 sodium ions from the cell while importing 2 potassium ions, K. What is the total...
09. Which of the followine statements regarding channel proteins (shown below (shown below) is for propratic of all a. Channel proteins can assist polar molecules to cross the plasma membrane by facilitated diffusion b. The gated ion channel can allow ions to pass when stimulated to open. c. The surface of a channel protein in contact with the bilayer would likely have hydrophilic amino acids d. Water plays a role in determining which ions are allowed to pass through an...
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