Homework Answers
Protons move across a a lipid bilayer via the protein "pumps".
The proton pumps use energy obtained from ATP hydrolysis to actively transport H+ across the plasma membrane against the concentration gradient.
Because there is both an electrical charge difference and concentration difference on the two sides of the membrane, the unequal distribution of ions establishes an electrochemical gradient.
The unequal distribution of the charges across the membrane creates a generates an electric field across the membrane which is known as membrane potential.
Such gradients store potential energy.
Thus, according to my knowledge, the answer would be equalizes the charge on each side of the membrane.
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1. Which of the following is not a function of the plasma membrane proton pump? O...
Assume that a bacterial cell maintains a proton gradient across its plasma membrane such that the...
Assume that a bacterial cell maintains a proton gradient across its plasma membrane such that the pH inside the cell is 8.0 when the outside pH is 7.0. Calculate the energy available from proton gradient if the membrane potential is +180 mM and the temperature is 25∘C. Find delta G inwards, Express your answer as an integer cal/mol! Please provide formulas and show work
1. 2. 3. Select all that apply. The sodium-potassium ion pump: hydrolyzes ATP, utilizing the free...
1.
2.
3.
Select all that apply. The sodium-potassium ion pump: hydrolyzes ATP, utilizing the free phosphate ion to temporarily bind to the transport protein. opens a channel through the membrane by phosphorylating one subunit of the transport protein. D is the only known ion pump. D is mediated by one enzyme that both hydrolyzes ATP and transports the ions. can be run in reverse, phosphorylating ADP to ATP Which of the following describes secondary active transport? O The antiport...
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...
Roles of the Na+/ K+ pump 1. Maintain the Nat/K+ concentration gradicnt across the plasma membrane....
Roles of the Na+/ K+ pump 1. Maintain the Nat/K+ concentration gradicnt across the plasma membrane. (That's obvious) 2. It plays a role in maintaining the resting membrane potential. Why? 3. The steep electrochemical gradient of Na+ is used in "coupled active transport" (coupled pumps). If the Nat/K+ pump stops, then these Na+ coupled transport mechanisms will also eventually stop. Explain The apical surface of the epithelial cells that line the lumen of the gut contains a symport that used...
The osteoclast proton pump acidifies the outside of the cell to pH3 from a pH value...
The osteoclast proton pump acidifies the outside of the cell to pH3 from a pH value inside the cell of 7. The potential across the osteoclast plasma membrane is 60mV (inside more negative). Given intracellular concentrations of ADP = 1mM and phosphate = 0.5 mM, what ATP concentration is necessary to drive the transport of two moles of protons outside the cell per mole of ATP hydrolyzed? The temperature is 37°C, and the standard free energy change for ATP hydrolysis...
1.A Which of the following substances is made of lipids? enzymes O plasma membrane sugars O...
1.A Which of the following substances is made of lipids? enzymes O plasma membrane sugars O DNA B. A solution with a pH of 9 is considered [Select] and has (Select] hydrogen ions compared to a solution with a pH of 4. Above is a figure of water interacting with an ion. What type of bonds are present between the water molecules and ions? Are electrons being shared between the water molecules and the ion? What type of bonds are...
Question 6 (1 point) Which of the following can be a source of energy for membrane...
Question 6 (1 point) Which of the following can be a source of energy for membrane transport? The movement of a molecule down its concentration gradient O ATP O The movement of a molecule up its concentration gradient ATP or the movement of a molecule up its concentration gradient
QUESTION 5 Animal cells have a negative membrane potential; why is this O A. All of...
QUESTION 5 Animal cells have a negative membrane potential; why is this O A. All of these answers are correct B. Respiration produces an abundance of acidic metabolites. C. None of these answers are correct OD. Proton pumps in the plasma membrane pump H+ out of the cell. O E. Sodium-potassium pumps export more Na+ than they import K+ into the cell.
Create a concept map of cellular transport using the following terms: Cellular transport ,Plasma membrane, Selective...
Create a concept map of cellular transport using the following terms: Cellular transport ,Plasma membrane, Selective permeability, Passive transport, Sodium-potassium pump, Active transport, Diffusion, Energy, Concentration gradient,Endocytosis, Osmosis, Exocytosis
Question 18 (6 points, 1 point for each correct answer): Match the following processes (designated I,...
Question 18 (6 points, 1 point for each correct answer): Match the following processes (designated I, II, or III) that represent various types of transport across a biological membrane with the statements designated A-D: 1. Water diffusion through the lipid bilayer of the biomembrane. II. Glucose transport via the glucose transporter in the plasma membrane. III. Pumping of protons across the lysosome membrane by a proton pump similar to the ATP-synthase complex. Write down your answers in the blank space...
1.
2.
3.
Select all that apply. The sodium-potassium ion pump: hydrolyzes ATP, utilizing the free phosphate ion to temporarily bind to the transport protein. opens a channel through the membrane by phosphorylating one subunit of the transport protein. D is the only known ion pump. D is mediated by one enzyme that both hydrolyzes ATP and transports the ions. can be run in reverse, phosphorylating ADP to ATP Which of the following describes secondary active transport? O The antiport...
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...
Roles of the Na+/ K+ pump 1. Maintain the Nat/K+ concentration gradicnt across the plasma membrane. (That's obvious) 2. It plays a role in maintaining the resting membrane potential. Why? 3. The steep electrochemical gradient of Na+ is used in "coupled active transport" (coupled pumps). If the Nat/K+ pump stops, then these Na+ coupled transport mechanisms will also eventually stop. Explain The apical surface of the epithelial cells that line the lumen of the gut contains a symport that used...
1.A Which of the following substances is made of lipids? enzymes O plasma membrane sugars O DNA B. A solution with a pH of 9 is considered [Select] and has (Select] hydrogen ions compared to a solution with a pH of 4. Above is a figure of water interacting with an ion. What type of bonds are present between the water molecules and ions? Are electrons being shared between the water molecules and the ion? What type of bonds are...
Question 6 (1 point) Which of the following can be a source of energy for membrane transport? The movement of a molecule down its concentration gradient O ATP O The movement of a molecule up its concentration gradient ATP or the movement of a molecule up its concentration gradient
QUESTION 5 Animal cells have a negative membrane potential; why is this O A. All of these answers are correct B. Respiration produces an abundance of acidic metabolites. C. None of these answers are correct OD. Proton pumps in the plasma membrane pump H+ out of the cell. O E. Sodium-potassium pumps export more Na+ than they import K+ into the cell.
Question 18 (6 points, 1 point for each correct answer): Match the following processes (designated I, II, or III) that represent various types of transport across a biological membrane with the statements designated A-D: 1. Water diffusion through the lipid bilayer of the biomembrane. II. Glucose transport via the glucose transporter in the plasma membrane. III. Pumping of protons across the lysosome membrane by a proton pump similar to the ATP-synthase complex. Write down your answers in the blank space...
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