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by: Keely Moen


Keely Moen
Texas State
GPA 3.93


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Class Notes
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This 6 page Class Notes was uploaded by Keely Moen on Wednesday September 23, 2015. The Class Notes belongs to BIO 1320 at Texas State University taught by Staff in Fall. Since its upload, it has received 19 views. For similar materials see /class/212817/bio-1320-texas-state-university in Biology at Texas State University.




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Date Created: 09/23/15
Practice guestion set 3 l A scientist isolated two proteins protein 39A39 from chicken and protein B from mouse and gave them orescent tags Then he injected both proteins into cultured human cells The protein 39A went into in the nucleus and the protein B stayed in the cytoplasm What would you logically predict from this observation A Every one out of two proteins go into the nucleus B Chicken proteins can go into the human nucleus but mouse proteins cannot C The protein A has a NLS while the protein B does not have a NLS D human nucleus can take in any foreign protein 2 If an mRNA molecule has to be moved from nucleus to the cytoplasm which of the following events should happen first A Importin binds to the mRNA molecule to be exported B The nuclear localization signal of the molecule binds to importin C Importin binds to exportin and moves it out of the nucleus D Exportin recognizes the mRNA molecule to be transported and binds to it 3 Which of the following is a characteristic of transport of proteins through the nuclear pore complex A It is an energydemanding process requiring ATP B Escort proteins are involved during the transport process C Transport can happen into the nucleus or out of the nucleus D All of the above E None of the above 4 What would happen if there is a mutation in importin that makes it unable to recognize the NLS A Only the proteins with nuclear localization signals will enter the nucleus B Some proteins with nuclear localization signals will not enter the nucleus C All proteins normally found only in the cytoplasm would appear in the nucleus D Exportin will transport proteins into the nucleus 5 What is an ER signal sequence A A short amino acid sequence found in proteins that enter into ER B They are found in all proteins that are synthesized on ribosomes C They are recognized by importin or exportin D A small protein found in the cytoplasm 6 What happens to different proteins while they move from cis face to the trans face of the Golgi apparatus A Various tags are added to them B They bind with importin or exportin C They are destroyed D None of the above happens in the Golgi apparatus 7 What is common to both actin microfilaments and microtubules A They are similar in diameter B They have a polarity C They are made up of actin D They resemble small hollow tubes 8 What characteristics contribute mainly to the function of microfilaments and microtubules for moving things directionally A They are composed of a large number of different proteins B They have polarity and they can associate with motor proteins C They are membranes that have elasticity D They are nonpolar firm and unchanging rope like structures 9 If kinesin is unable to use ATP as an energy source due to a mutation in kinesin molecule what will be a consequence inside cells A Kinesin will be accumulated inside cells B Many vesicles will not be transported to their proper destinations C ATP will not be produced inside the cells D More vesicles will be formed by ER and Golgi 10 What is the role of myosin in association with the cytoskeleton A It works as the motor protein for actin microfilaments B It breaks down the cytoskeleton C It is involved in agella movement D It is a structural component of intermediate filaments ll Tight junctions are cellcell junctions found between adjacent cells of the epithelium that lines the small intestine What is the function of these cellular junctions A to release digestive enzymes into the intestinal lumen B to attach epithelial cells to a basement membrane called basal lamina C to recognize pathogenic organisms present in the lumen of the small intestine D to seal the epithelium and prevent movement of substances between cells 12 A gap junction is different from tight junction and an anchoring junction because A It is found in plant cells B It is found only in epithelial cells C It glues two adjacent cells together D It allows the passage of substances 13 Which of the following may NOT be a feature or a function of plasmodesmata A they provide a hole between adjacent plant cells B they allow any molecule to pass through C they are comparable to gap junctions found in animal cells D they allow ER of adjacent cells to join 14 Why are tight junctions found only in certain types of tissues while anchoring junctions such as desmosomes are found in a wide array of cells A Tight junctions are not as strong as desmosomes B Tight junctions are required only in cells where communication between adjacent cells is particularly important C Tight junctions allow any molecule to pass through them D Tight junctions are found only in between cells in tissues that must be watertight Practice guestion set 4 1 Why is the ATP synthesis associated with mitochondrial electron transport chain also called oxidative phosphorylation A Because it is a highly efficient process to make ATP B All electron carriers involved with the transport chain are phosphorylated C A phosphate group is added to a glucose molecule D ATP is produced as a result of electron transport chain generated by oxidation of NADH and FADHz 2 The inner mitochondrial membrane A carries the components of the electron transport chain B contains enzymes responsible for glycolysis C is highly folded to increase the surface area D both A and B E both A and C 3 Following glycolysis and Citric acid cycle the carbon skeleton of glucose is completely broken down to C02 What happens to the energy stored in the CH bonds of glucose A All is converted to heat B Some is saved as chemical energy in ATP C All is saved as water D Released to the atmosphere with carbon dioxide 4 Which of the following takes place during the process known as glycolysis A breakdown of a water molecule B release of carbon dioxide C NADH and FADHz giving their electrons to the electron transport chain D breakdown of glucose to two molecules of pyruvate 5 Why are fermentation reactions important for cells A They regenerate NAD and produce some ATP in the absence of oxygen B They produce alcohol used in alcoholic beverages C They keep the Citric acid cycle going in the absence of oxygen D They utilize oxygen as the final electron acceptor 6 Which of the following represents the correct order of reactions happen in cellular respiration A electron transport chain gt Citric acid cycle gt glycolysis gt ATP production B glycolysis gt Citric acid cycle gt electron transport chain gt ATP production C glycolysis gt Carbon dioxide release gt oxidative phosphorylation gt acetleoA Formation D photophosphorylation gt light reactions gt dark reactions gt Oxygen release 7 What characteristic of ATP is responsible for its ability to carry high energy A the hydroxyl groups of the ribose sugar B the closely spaced negative charges in phosphate groups C the CH bonds of the ribose sugar D the nitrogen atoms in adenine 8 Which of the following takes place as a direct result of the electron transpott chain in mitochondrial inner membrane A breakdown of a glucose molecule to carbon dioxide B production of NADH and FADH2 C transporting protons across the inner mitochondrial membrane D breakdown of glucose to twopyruvate molecules 9 Photosystem I and photosystem II A are present in the thylakoid membrane B have groups of pigment complexes known as antenna pigments C both can absorb sun s energy to excite electrons D all of the above 10 As a direct result of the electron transport chain during photosynthetic light reactions A a proton gradient is created across the thylakoid membrane B water molecules are broken down C Antenna pigments absorb energy from sunlight D sugar molecules are broken down to make ATP 11 Sunlight comes in a range of wavelengths that show different colors However plants absorb only ce1tain wavelengths and transmit the other wavelengths Which of the following determines which wavelengths are absorbed by plants A availability of water to the plant B light that is transmitted by the plant C nature of pigments present in the plant D wavelengths of light that hit the plant 12 The major purpose of water breakdown during photosynthesis is to A remove excess water from chloroplasts B generate oxygen for aerobic respiration C provide electrons to photosystem II reaction center D function as a cooling system for plants 13 Melvin Calvin was the pioneer scientist who worked on lightindependent reactions During one of his elegant experiments he exposed photosynthetic cells to radioactive carbon dioxide in which the carbon atom is radioactive The radioactivity can be detected by exposing it to Xray film When this radioactive carbon dioxide is fixed by cells which of the following compounds would be radioactive first A glucose B phosphoglyceraldehyde PGAL C oxygen D phosphoglyceric acid PGA 14 What is the quot between light A r J andlight 39 J r J reactions of photosynthesis A Light dependent reactions happen during the daytime light independent reactions happen during night B There is no connection at all They are completely separate processes C The products of lightdependent reactions are used in lightindependent reactions D The products of lightindependent reactions inhibit the lightdependent reactions 15 What is the role of NADPH during photosynthesis A providing electrons for electron transport chain in thylakoid B exciting an electron from the reaction center chlorophyll molecule C carrying electrons from the end of electron transport chain to the CalVin cycle D providing energy for ATP synthesis by photophosphrylation


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