Virtually all animal cells have a Na+/K+ pump. Which of the following statements concerning it is NOT correct? O a. It is an uniport. O b. O C. O d. It is an active transporter. It transports Na* and K* by consuming ATP as energy. It is also called Na+/K* ATPase.
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- Here is a chloride cell in the gill epithelium of a fish. For reference, NKA = Na+/K+ ATPaseNKCC = Na+/K+/Cl- cotransporter. What type of fish would you expect to see this type of chloride cell? A. fresh water fish B. salt water fish C. eitherWhich of the following is incorrect about membrane transport systems? a. Glucose transport in red blood cells is a uniport system b. The Na+/K+ ATPase is an antiport system c. The H+/K+ ATPase is an active transport system d. The chloride-bicarbonate exchanger in erythrocytes is a uniport systemA fish swims from a body of cool water into a body of warm water. As its body temperature rises, its rate of O2 consumption increases. The warm water, however is likely to have a lower concentration of dissolved O2 than the cool water because the solubility of O2 in water decreases as temperature increases. These two factors taken together, an increase in the fish's rate of O2 consumption and a decrease in the dissolved O2 concentration of its environmental water, can make it difficult for the fish to obtain enough O2 to meet its needs. The two factors can act as a two-pronged trap. Actually, however, the fish may face a three-pronged trap. How is the increase in temperature likely to affect the O2 affinity of the fish's hemoglobin, and how could the effect on hemoglobin add even further to the challenge the fish faces? Does global warming pose concerns of this sort?
- Which of these transport pathways require ATP? Select all that apply. A. Sodium-potassium pump B. Glucose transporter C. Osmotic diffusion D. Calcium pumpIn a Bio lab you determine that the cost of transport for two fish from different species is 1 kJ/km for fish one, and 10 kJ/km for fish two. Provide an estimate of the swimming speed of each fish assuming that a) both fish have the same metabolic rate; b) fish two has a metabolic rate 10 times higher than the metabolic rate of fish one; and c) fish one has a metabolic rate that is 100 times smaller than the metabolic rate of fish two. Note that the ratio of metabolic rate to speed defines the cost of transport in units of energy/distanceWhich of the following statements about the sodium-potassium pump is correct? A) Both sodium and potassium move down their concentration gradient across the membrane B) 2 sodium ions are pumped out of the cell against their concentration gradient C) The sodium-potassium pump is a type of cotransport. D) ATP is used as an energy source
- 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.Compare and contrast the different transport mechanisms: Electrochemical gradient Carrier-Mediated/Not Metabolic Energy Na+ Gradient Inhibition of Na-K PumpSharks live in marine (saltwater) habitats and are osmoconformers. Based on this information which of the following is/are true (select all that apply): A. Sharks have tissues/body fluids that are isoosmotic relative to the environment B. Sharks have tissues/body fluids that are hypoosmotic relative to the environment C. Sharks devote considerable energy to osmoregulation D. Sharks do not devote much energy to osmoregulation
- A circulatory system moves all of these things through an animal's body, but which is most important? A. 02 B. glucose C. hormones D. cO2 Why is 02 needed in aerobic cellular respiration? A. to oxidize glucose during glycolysis; B. to take electrons at the end of the electron transport chain; C. to attract H+ across the ATP synthase so that it spins; D. to oxidize pyruvate as it enters A circulatory system moves all of these things through an animal's body, but which is most important? A. 02 B. glucose C. hormones D. cO2 Why is 02 needed in aerobic cellular respiration? A. to oxidize glucose during glycolysis; B. to take electrons at the end of the electron transport chain; C. to attract H+ across the ATP synthase so that it spins; D. to oxidize pyruvate as it enters the mitochondrion;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 crossA change in ion (salt) concentrations in an animal’s body may result ina. altered membrane potentials that disrupt normal cell function.b. disruption of certain biochemical processes that occur in the cell.c. movement of water between fluid compartments.d. a and b only.e. a, b, and c.