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USC BISC 220L - BISC 220 quiz questions

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Ribulose is a(n). ketohexose. ketotriose. aldotetrose. ketopentoseThe elemental analysis for glucose is C6H12O6 . What is the elemental analysis for maltose (aka glucosylglucose)? . 2*(C6H12O6) . C12H12O12 . C12H22O11 . C12H22O12. None of these answers are correct. Consider a solution of a weak acid at a pH equal to its pKa. By how much would the pH change, and in which direction, if we added to this solution enough base to neutralize 10% of the total acid?. 0.1, higher. 0.1, lower. 0.18, higher. 0.18, lower. 0.40, higherPlease decide whether the following statement is true or false: A charged atom always reacts similarly to the neutral form of the atom. True FalseThe fact that the outer membrane of the nuclear envelope has bound ribosomes allows one to most reliably conclude thatat least some of the proteins that function in the nuclear envelope are made by the ribosomes on the nuclear envelope.- the nuclear envelope is not part of the endomembrane system.- the nuclear envelope is physically continuous with the endoplasmic reticulum.- small vesicles from the Golgi fuse with the nuclear envelope.- nuclear pore complexes contain proteins. How many different polypeptides, each composed of 15 aminoacids, could be synthesized using only a set of 10 amino acids? [The symbol ^ indicates exponentiation, so 4^2 = 16.] 10^15Many organisms survive in environments of varying temperature. Fish, for example, live in water that may change its temperature a great deal between summer and winter, or between the surface and at depth. Which of the following changes in the composition of the plasmalemma would be most useful for an organism moving into colder environments?- increase the fraction of unsaturated fatty acids in the membrane lipids In animal cells, hydrolytic enzymes are packaged to prevent general destruction of cellular components. Which of the following organelles functions in this compartmentalization? Lysosome_____________TEST 2______________For a given reaction, G = -4 kcal/mole and the energy ofactivation for the uncatalyzed reaction = 5 kcal/mole. You add an enzyme, after which the activation energy falls to 3 kcal/mole. What is the energy of activation forthe reverse reaction in the presence of the same amount of enzyme?7 kcal/mole When G is -4 and the Ea with the enzyme is 3, the Ea for the reverse reaction is 4+3, so 7 is the answer.A molecule that is phosphorylatedHas an increased chemical reactivity; it is primed to do cellular workAn electron loses potential energy when itAdd more of the enzymeSuppose the interior of the thylakoids of isolated chloroplasts were made acidic and then transferred in the dark to a phosphate buffer at pH 8 that contained ADP. What would be likely to happen?The isolated chloroplasts will make ATP.If photosynthesizing green algae are provided with CO2 synthesized with heavy oxygen ( 18O), later analysis will show that all but one of the following compounds produced by the algae contain the 18O label. That one isO2If cells in the process of dividing are subjected to colchicine, a drug that interferes with the functioning ofthe spindle apparatus, at which stage will mitosis be arrested?MetaphaseA particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question ismost likely inG1The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following?Anaphase 1 or 2Why do chromosomes coil during mitosis?To allow the chromosomes to move without becoming entangled and breakingIf atmospheric pressure is 760 mm Hg and pressure in the alveolar air is 758 mm Hgair is flowing into the lung.In humans, secretion of alveolar surfactant occurs late in fetal development. What specific problem does this cause forpremature babies?Babies have difficulty inflating their lungs.The fetus gets its O2 from maternal blood in the placenta. How would the O2-dissociation curve for fetal hemoglobin compare with that of maternal hemoglobin? The fetal curve will be to the


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USC BISC 220L - BISC 220 quiz questions

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