ear ago, with the evolution of membrane-based process of photosynthesis photosyn
ID: 255832 • Letter: E
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ear ago, with the evolution of membrane-based process of photosynthesis photosynthess at organisms could make their years between the appearance of bacteria that split water and release own organic molecules from CO2 gas. Delay of about the accumulation of high level of O2 in the atmosphere, is due to reacion 02 during photosynthesis and ferrous iron (Fe) in the early oceans of oxygen with abundant A) 1 billion C) 3 billion B) 2 billion D) 100 million 27. NADH dehydrogenase on the mitochondrial inner membrane is driven through a cycle of 3 conformations: A, B, and C. The transition from is energetically unfavorable and needs to be coupled to an energetically favorable reaction transport that is electron A) A to B B)BtoC D) C to A C) A to C 28. Bongkrekic acid is an antibiotic that inhibits the ATP/ADP transport protein in the inner in mit mitochondrial membrane. Which of the following will allow electron transport to occur treated with bongkrekic acid? A) placing the mitochondria in anaerobic B) adding FADH2 -C) making the inner membrane permeable to protons D) inhibiting the ATP synthase +ions Therefore, when added to mitochondria, DNP A) will decrease the production of ATP B) will decrease the pH gradient across the membrane. will cause electron pump activity to stop. ) will decrease both the production of ATP and the pH gradient across the membrane. 30. Where are the proteins of the electron-transport chain located in chloroplasts during photosynthesis? B) stroma D) thylakoid membrane A) thylakoid space C) inner membrane 31. You are interested in Fuzzy, a single-pass transmembrane protein that functions within the ER membrane. Given that information, which of the following statement must be false? A) The Fuzzy precursor protein has an N-terminal ER signal sequence that binds to SRP. B) Multiple ribosomes can be bound to the mRNA encoding Fuzzy during translation. C) Fuzzy must contain a hydrophobic stop-transfer sequence. D) Both N-terminus and C-terminus of Fuzz are in the cytosol. 32. What is the role of the nuclear localization signal sequence in a nuclear protein? A) It is a hydrophobic sequence that enables the protein to enter the nuclear membranes B) It is bound by nuclear transport receptor proteins that direct the nuclear protein across the nuclear pores C) It aids in protein unfolding so that the protein can thread through nuclear pores. D) It prevents the protein from diffusing out of the nucleus through nuclear pores. 33. Which of the following statements about the endoplasmic reticulum (ER) is false? A) The ER is the major site for new membrane synthesis in the cell. B) Proteins to be delivered to the ER lumen are synthesized on smooth ER C) Steroid hormones are synthesized on the smooth EFR D) The ER membrane is contiguous with the outer nuclear membrane.Explanation / Answer
Answer:
27) NADH dehydrogenase on the mitochondrial inner membrane is driven through a cycle of 3 conformations A, B and C. The transition from B to C is energetically unfavorable and needs to be coupled to an energetically favorable reaction that is electron transport.
28) Bongkrekic acid is an antibiotic that inhibits the ATP/ADP transport protein in the inner mitochondrial membrane. Which of the following will allow electron transport to occur in mitochondria treated with bongkrekic acid?
29) The drug dinitrophenol (DNP) makes the inner mitochondrial membrane permeable to H+ ions. Therefore, when added to mitochondria, DNP
30) Where are the proteins of the electron-transport chain located in chloroplasts during photosynthesis?
31) You are interested in Fuzzy, a single-pass transmembrane protein that functions within the ER membrane. Given that information, which of the following statement must be false?
32) What is the role of nuclear localization signal sequence in a nuclear protein?
33) Which of the following statements about the endoplasmic reticulum (ER) is false?
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