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Purdue BIOL 11000 - Nitrogen
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BIOL 11000 1st Edition Lecture 9 This sample exam has 31 questions meant to represent some of the topics covered in the 2nd exam and the kinds of questions on it. The correct answer is in bold. If you’d like to take the exam without seeing the answers, simply “select all” (Ctrl-A) and “unbold” (Ctrl-B) or their Mac equivalents.Warning, this is only a sample of the potential topics covered on the exam. There are topics covered in lecture that aren’t represented here, and they may be on the real exam. The real exam will have 33 questions, each worth 3 points, for 99 points. You’ll get 1 point for filling out the bubble sheet to make atotal of 100 points. There may also be some bonus questions. Good luck studying.1. Potassium (K) is an element in the first column of the periodic table, while fluorine (F) is an element inthe next to the last column of the periodic table. The compound KFA. is a crystalline solidB. is held together by hydrogen bonds between potassium and fluoride ionsC. contains negative potassium and positive fluoride ionsD. A and BE. B and C2. Nitrogen has 2 electrons in the 1s orbital, 2 electrons in the 2s orbital and 3 electrons in the 2p orbitals. Nitrogen has ___ electrons in its outer shell and makes ____ covalent bondsA. 5 and 3B. 4 and 4C. 3 and 5D. 2 and 6E. 1 and 7For the next 3 questions, fill in the table below and then answer the questions based on the table (only the answers to the questions would be scored on the exam).Electrons in each set of orbitalsElementAtomic Number1s2s2p3s3pC6N7F9Mg12Cl17These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.3. Which element is most likely to form a negative ion?A. CB. NC. FD. MgE. none of them are likely for form a negative ion4. How many covalent bonds is N likely to form?A. 1B. 2C. 3D. 4E. This is a trick question; N will not form covalent bonds5. Which element needs one more electron to fill the M=3 shell?A. CB. NC. FD. MgE. Cl6. Which polar functional group has only C and H atoms?A. hydroxylB. carbonylC. methyleneD. methylE. none of the above7. Which of the following functional groups is polar?A. methyl (CH3)B. carboxyl (COOH)C. methylene (CH2)D. all of the aboveE. none of the above8. A fatty acid has several nonpolar methyl (CH3) and methylene (CH2) groups and one polar carboxylic acid (COOH) group. Which of the following statement(s) about this fatty acid is (are) true?A. This fatty acid is a nonpolar molecule because several nonpolar groups outweigh one polar groupB. This fatty acid is a polar molecule because the one polar group is larger than the nonpolar groupsC. The difference in electronegativity between C and O is less than the difference between C and HD. The fatty acid is polar in one part and nonpolar in anotherE. None of the above9. Which of the following statements about noncovalent bonding is not true?A. it creates interactions between alcohols and waterB. it holds together Na+ and Cl- ions in a crystalC. it is weaker than covalent bondingD. it creates reversible interactionsE. it includes van der Waals and H-bonding10. Which of the following is not true about van der Waals bonding?A. It forms between any two atomsB. It includes both an attractive and a repulsive component.C. It can only form between a polar part of one molecule and a polar part of another.D. It attracts all atoms via the van der Waals attractionE. It keeps all atoms from getting too close via the van der Waals repulsion.11. Which of the following is not true about hydrogen bonds?A. They form when a partially positive H atom is located between two partially negative atoms.B. They can form when an H is covalently bonded to an electronegative atom.C. They form between a polar part of one molecule and a polar part of another.D. They make effective, but reversible, interactionsE. They are stronger than covalent bonds.12. Consider the compound below:Which of the following statement(s) is(are) true?I. This compound has polar and nonpolar groupsII. This compound will donate hydrogen bonds to waterIII. This compound will accept hydrogen bonds from waterA. only IB. only IIC. only IIID. I and IIE. I, II, and III13. The hydrogen (H-) bonding in waterA. is strong, but reversible so that water stays a liquidB. gives water a low boiling point compared to molecules of similar sizeC. occurs between a hydrogen atom on one water molecule and an oxygen atom on the same water moleculeD. A and BE. A and C14. A solution at pH 6A. is neutralB. has an H+ ion concentration of 10-6C. has an OH- ion concentration of 10-8D. A and BE. B and C15. A solution at pH 12A. has 2-fold more H+ ions than a solution at pH 6B. has 2-fold fewer H+ ions than a solution at pH 6C. has 1,000,000-fold more H+ ions than a solution at pH 6D. has 1,000,000-fold fewer H+ ions than a solution at pH 6E. none of the above16. An amino groupA. loses a H+ ion at low pHB. is neutral at low pHC. is negatively charged at low pHD. is negatively charged at high pHE. none of the above17. Reduced organic compoundsA. have more hydrogen atoms bonded to carbon atoms than oxidized compounds of equivalent sizeB. have more oxygen atoms than oxidized compounds of equivalent sizeC. are oxidized in organisms like us to produce energyD. A and CE. B and C18. Which of the following is an example of a reduction reaction?A. the conversion of elemental chlorine to chloride ionsB. the conversion of an Fe3+ ion to an Fe2+ ionC. the conversion of a carboxylic acid (COOH) group to a methyl (CH3) groupD. the conversion of organic compounds will lots of O’s and few H’s to ones with fewer O’s and more H’s E. all of the above19. The major classes of macromolecules (proteins, nucleic acids, carbohydrates and lipids)A. Are all synthesized by condensation (dehydration synthesis).B. Are all broken down by hydrolysisC. Are all composed of simpler monomeric unitsD. All of the aboveE. None of the above 20. Biological polymers are not preserved at equilibrium (that is, they are eventually degraded) becauseA. there is a large activation energy barrier to their degradationB. monomers are more stable than polymers at equilibriumC. neither monomers nor polymers have activation energy barriers to their degradationD. polymers are more stable than monomers at equilibriumE. none of the above21. Two polypeptides have similar, but not identical,


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Purdue BIOL 11000 - Nitrogen

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