organisms could make their own organic molecules from C02 gas. Dera photosynthes
ID: 255766 • Letter: O
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organisms could make their own organic molecules from C02 gas. Dera photosynthes ear ago, with the evolution of membrane-based process of photosynthesis. years between the appearance of bacteria that split water and release the accumulation of high level of 02 in the atmosphere, is due to reaction of oxygen 02 during photosynthesis and ferrous iron (Fe*) in the early oceans. 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 that is electron A) A to EB ?) ? to C 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 conditions 8) adding FADH2 -C) making the inner membrane permeable to protons D) inhibiting the ATP synthase 29 The drug dinitrophenol (DNP) makes the inner mitochondrial membrane permeable to tHt ions. A) will decrease the production of ATP B) will decrease the pH gradient across the membrane. will cause electron pump activity to stop D) 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 a n 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 B) It is bound by nuclear transport receptor proteins that direct the nuclear protein across the nuclear pores hydrophobic sequence that enables the protein to enter the nuclear membranes. 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. 26 one billion.
27. D. C to A
28. D. inhibiting the ATP synthase
29. D It will decrease both the production of ATP and pH gradient across the membrane.
30. Thylakoid membrane.
31. C FUZZY must containa hydrophobic stop transfer sequence.
32 B. it is bound to nuclear transport receptor protein that direct the nuclear protien cross the nuclear pore.
33 B. protien are synthesised by rough ER and smooth ER help in syntheising of lipuid steroid.
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