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9. For the DNA segment with nucleotide sequence 5' TATCGC 3', how many hydrogen bonds in total hold the base pairs between this segment and its complementary strand? А. 5 В. 6 С. 15 D. 18 E. Cannot be determined

9. For the DNA segment with nucleotide sequence 5' TATCGC 3', how many hydrogen bonds in total hold the base pairs between this segment and its complementary strand? А. 5 В. 6 С. 15 D. 18 E. Cannot be determined

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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9. For the DNA segment with nucleotide sequence 5' TATCGC 3’, how many hydrogen bonds in total hold the base pairs between this segment and its complementary strand? А. 5 В. 6 С. 15 D. 18 E. Cannot be determined 10. What is the relation between the Fischer projection of two molecules below? H H- -OH Но- но- H- Но H- H- -OH- Но- CH2OH CH2OH A. C2 epimers В. СЗ ерimers C. Enantiomers D. Anomers E. Superimposable molecules Section B: True / False (10 marks) A group is deprotonated when its pKa value is lower than the pH of the solution. 1. T or F 2. a and B configurations are used to describe enantiomers. T or F 3. Hydrogen bond can be formed between two peptide bonds. T or F 4. A single strand of RNA has 20% U so it also has 20% A. T or F 5. Arginine's pI lies between 2.34 and 9.6. T or F 6. O-6 fatty acids have fewer double bonds than @-9 fatty acids have. T or F 7. The net charge of glycine changes at different pH. T or F 8. The hydroxyl group in threonine is deprotonated at high pH. T or F 9. Deoxyguanosine contains a monophosphate. T or F 10. Ketohexose gives positive result in Benedict's test. T or F 3
Transcribed Image Text:9. For the DNA segment with nucleotide sequence 5' TATCGC 3’, how many hydrogen bonds in total hold the base pairs between this segment and its complementary strand? А. 5 В. 6 С. 15 D. 18 E. Cannot be determined 10. What is the relation between the Fischer projection of two molecules below? H H- -OH Но- но- H- Но H- H- -OH- Но- CH2OH CH2OH A. C2 epimers В. СЗ ерimers C. Enantiomers D. Anomers E. Superimposable molecules Section B: True / False (10 marks) A group is deprotonated when its pKa value is lower than the pH of the solution. 1. T or F 2. a and B configurations are used to describe enantiomers. T or F 3. Hydrogen bond can be formed between two peptide bonds. T or F 4. A single strand of RNA has 20% U so it also has 20% A. T or F 5. Arginine's pI lies between 2.34 and 9.6. T or F 6. O-6 fatty acids have fewer double bonds than @-9 fatty acids have. T or F 7. The net charge of glycine changes at different pH. T or F 8. The hydroxyl group in threonine is deprotonated at high pH. T or F 9. Deoxyguanosine contains a monophosphate. T or F 10. Ketohexose gives positive result in Benedict's test. T or F 3
Section C: Short Questions 1. Consider the peptide with amino acid sequence NICE. а. Write the full name and the three-letter abbreviations of the amino acids in the (8 marks) Calculate the net charge of the peptide at pH 7.0. Show you work in a table. Step (3 marks) Calculate the pI of the peptide. Show you work in a table. Step marks are counted. (6 marks) peptide. b. marks are counted. с. 2. Write the full name of amino acids, from N-terminus to C-terminus, after hydrolysis of the following polypeptide. How many peptide bonds are present? (5 marks) H,N-CH-C- CH- CH-C N-CH-C-0- H,C-CH H CH, CH2 H ČH,-C-NH, ČH H 3. Complete the following table. (9 marks; 0.5 mark @ for a-d, 1 mark @ for e) а. СНО b. CH,OH СНО с. HO-H HO -H- C=0 H- -OH H- -O- H -O- HO-H HO-*H Нон CH,OH HO-H HO-*H CH,OH CH-OH a. Number of chiral carbon b. D or L configuration c. Aldose or ketose? d. If the -OH of carbon with * forms a bond with the carbon of the carbonyl group, the cyclic form will be a furanose or pyranose? 4
Transcribed Image Text:Section C: Short Questions 1. Consider the peptide with amino acid sequence NICE. а. Write the full name and the three-letter abbreviations of the amino acids in the (8 marks) Calculate the net charge of the peptide at pH 7.0. Show you work in a table. Step (3 marks) Calculate the pI of the peptide. Show you work in a table. Step marks are counted. (6 marks) peptide. b. marks are counted. с. 2. Write the full name of amino acids, from N-terminus to C-terminus, after hydrolysis of the following polypeptide. How many peptide bonds are present? (5 marks) H,N-CH-C- CH- CH-C N-CH-C-0- H,C-CH H CH, CH2 H ČH,-C-NH, ČH H 3. Complete the following table. (9 marks; 0.5 mark @ for a-d, 1 mark @ for e) а. СНО b. CH,OH СНО с. HO-H HO -H- C=0 H- -OH H- -O- H -O- HO-H HO-*H Нон CH,OH HO-H HO-*H CH,OH CH-OH a. Number of chiral carbon b. D or L configuration c. Aldose or ketose? d. If the -OH of carbon with * forms a bond with the carbon of the carbonyl group, the cyclic form will be a furanose or pyranose? 4
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