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possible questions for cell bio

possible questions for cell bio - Name_TF_Credit 1 A 2 D 3...

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Name_________________________________TF__________________Credit_____________ 1. A 2. D 3. E 4. C 5. B 6. E 7. A 8. A 9. D 10. E 11. C 12. C 13. A 14. C 15. D 16. D 17. D 18. B 19. A 20. A 21. (5pts) A) List two structural differences between DNA and RNA. Deoxyribose vs ribose, typically ds vs ss, presence of tymidine vs uracil B) The sequence below is found on the coding strand of a DNA molecule. List the appropriate complementary strand, the mRNA that would result from transcription and the peptide sequence that is encoded (use the chart of the genetic code found on the last page of the test booklet). Be sure to label each strand with the appropriate 3’and 5’ designations. 5’ GATGGCATTCGCTGTTTG3’ 3’ CTACCGTAAGCGACAAAC5’ PROTEIN - mRNA Asp-Gly-Ile-Ala-Cys-Leu 5’GAUCCGTUUCGCUGUUUC3 ’ 22. (3 pts) What is the effect of a double bond on fatty acid structure? Do not describe changes to properties such as melting temperature. Most double bonds in fatty acids are in the cis configuration. This results in a rigid bend (kink) in the hydrocarbon chain Page 1 of 8
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23. (4 pts) If the average molecular weight of the 20 standard amino acids is 138, why do biochemists divide a protein’s molecular weight by 110 to estimate its number of amino acid residues? 138 – 18 for water lost in the condensation reaction gives 120 120 gets weighted to 110 – more of the small residues are present in the typical protein so the number is adjusted to account for this bias 24. (5pts) What is the octet rule? List three ways in which atoms may interact to fulfill this rule. Atoms like to have their outer orbitals (electron shells) filled. The outer shell can hold 8 electrons thus the octet rule. Atoms can fulfill this rule by gaining, losing or sharing electrons. 25. (5 pts) Define each in 20 words or less: A) Amphipatic – having hydrophobic (nonpolar) and hydrophilic (polar) regions B) cation and anion – cation is a positively charged ion, anion is a negatively charged ion C) furanose and pyranose – furanose is a sugar with a 5 member ring, pyranose is a sugar with a 6 member ring D) chiral – the property of being asymmetric - a molecule that can not be superimposed on its mirror image (ok with a carbon with 4 different groups) E) pH – a measure of hydrogen ion concentration – negative log of [H+] 26. (5 pts) Answer the following questions about the four sugar molecules shown below. A. Which are L-sugars? C and D B. Which are epimers? A and B , A and C C. Which sugar is the entaniomer of sugar A ? D D. Circle the carbon on sugar A that will become the anomeric carbon if the sugar converts to the pyranose configuration. The CHO carbon
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