1. All of the following statements are true of active transport across membranes except: a. It has an intrinsic directionality b. Energy is always required c. Transport of one species is always coupled to that of another species d. It requires a carrier, or “pump” 2. T/F Electrons excited in photosystems I can be used both in the production of ATP and the reduction of NADP+

1. All of the following statements are true of active transport across membranes except: a. It has an intrinsic directionality b. Energy is always required c. Transport of one species is always coupled to that of another species d. It requires a carrier, or “pump” 2. T/F Electrons excited in photosystems I can be used both in the production of ATP and the reduction of NADP+

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 12RQ: Water moves via osmosis _______. a. throughout the cytoplasm b. from an area with a high...

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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.
3 Diagram A below illustrates schematically a classic experiment designed to test the chemi- osmotic hypothesis. Phospholipid vesicles were made to contain beef heart mitochondrial ATP syn- thase and bacteriorhodopsin, a light driven proton pump isolated from Halobacterium holobium. Under light illumination, proton translocation by bacteriorhodopsin results in ATP synthesis when ADP and inorganic phosphate (Pi) are added to the suspension of vesicles. Diagram B shows a plot of the rate of ATP synthesis as a function of the proton gradient ApH. Bacteriorhodopsin in synthetic vesicle 100F A outside inside 5아 Fo F1 0.3 0.6 0.9 1.2 A pH (a) how this differs from its orientation in mitochondria. Given the orientation of the components of ATP synthase complex in diagram A, describe (b) cavity of the vesicle become the region of low proton concentration or the region of high proton con- centration? Explain your reasoning. Under light illumination to activate bacteriorhodopsin to drive ATP…
Chemiosmosis is described as an energy coupling mechanism that O a. builds up membrane potential across membrane O b. lowers pH in the intermembrane space. O c. phosphorylates substrate molecules. d. uses the stored energy of the proton gradient to synthesize AIP e. inhibits electron transfer along the electron transport chain.
20. Which of the following is NOT true of ABC transport? A. An example of active transport systems B. ATP-dependent process C. Employ carrier proteins D. It moves molecules against the concentration gradient E. Observed only in Eukarya
1. Which of these compounds will cross the cell membrane without the aid of a membrane transport protein, and why? H3 NH NH 2. By what transport process will the above compound be transported? What are the factors which drive movement across the membrane in this process? Does this process require input of energy?
1. Which of the following regarding the Rab protein is false? After having supported the targeting and fusion of a transport vesicles the Rab proteins is recycled; the Rab proteins is bound to its effector on the target membrane; GTp in the rab proteins can't be hydrolyzed to gdp; the rab proteins is bound to the vesicles membrane In its gtp bound form 2. Most proteins destined to enter the endoplasmic reticulum? Undergo their entire translation on th er membrane; crossd the membrane in a folded state; rely on the signal recognition; retain their signal sequence after reaching the lumen of the er 3. Indicate which statement is either true or false. Glyclosylation is needed for delivering hydraolase to the lysosome; the high ph in the lysosomal lumen facilitates the unloading of hydrolases from the m6p receptor; the mannose 6 p modification on the lysosomal hydrolases is completed in the er
26. Identify the correct statement that best describes about the chemiosmotic mechanism. * A. Explains about the transport of Na+ and K+ across cell membranes is by active transport. O B. Explains how transport by facilitated diffusion reaches a saturation limit. O C. A process in which proton gradient that drives the formation of ATP. O D. Explains about cytochromes which phosphorylate ADP to form ATP. 27 When oygen is present, determine the number of ATP yield per glucose
Which of the following statements is true about active transport? A. The transported species always moves against its electrochemical gradient. B. It is needed only for the transport of polar molecules. C. It is exergonic. D. It must be linked to ATP hydrolysis.
Many molecules move across membranes by diffusion. Which of the following statements related to membrane diffusion is correct? A. Although they require ATP, ABC transporters move molecules by diffusion. B. For large molecules, facilitated diffusion is often slower than simple diffusion. C. To support photosynthesis, CO2 gets into the Chlamy chloroplast through facilitated diffusion. D. Diffusion is an exergonic (-ΔG) process.
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
6) Pore-forming toxins are a class of protein-based toxic polymers that result in the formation of large multi-protein channels that allow the free flow of substrates and liquid in and out of a cell or organelle. Research shows that these can attach to the outer mitochondrial membrane, or on the thylakoid membranes Hollyal of chloroplasts. Meman Extracelular binding space Proteiniciati Inactive soluble T obare Lipid Activation Active P Assembly Membrane tion Pelit K Partially formed pome Nunta Inson Large molecule A Protein What would the possible consequences be if this pore-forming toxin attached to the mitochondrial outer membrane or the thylakoid membrane? Explain why. ATP Nature Reviews Microbiology