CH1131_Tutorial 1 Questions_05 07 Sep 2017.pdf

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1 CH1131_Biomolecular Engineering_Tutorial 1_Questions 05, 07 Sep 2017 1. It makes sense that DNA, the genetic material of most organisms, should be sequestered in a specific area of the cell to protect it and prevent it from potential damage. What is an advantage of making the mRNA, the working copy of the genetic code, so much more labile than DNA? 2. You discover a mutant organism that has difficulty transcribing a particular important gene. It appears that when transcription of this gene should be occurring, RNA polymerase has difficulty determining where transcription should start. What DNA sequence is most likely to be responsible for this problem? 3. Most mRNAs coding for protein have long stretches of adenine ribonucleotides [poly(A)] on the 3' end of the message. Does that mean that each gene from which these mRNAs are derived has a corresponding stretch of poly(dT) at the 5' end of the template from which the mRNA was formed? 4. The building blocks of polymers are called _______. a. minipolymers b. monoblocks c. monomers d. portions e. octamers 5. Which of the following is a nucleoside? 6. Which of the following is a nucleotide?
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2 7. 35. The DNA building blocks are known as ________. 8. 36. The building blocks of a nucleotide are ___________. a. a pentose sugar and a phosphate group b. a pentose sugar and a nitrogenous base c. a phosphate group and a nitrogenous base d. a pentose sugar, a phosphate group and a nitrogenous base e. a pentose sugar, a phosphate group and an amino acid 9. Purines are characterized by _______; pyrimidines are characterized by ______. 10. The two strands of the DNA double helix are characterized as being ________.
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3 11. What gives a DNA molecule its negative charge? 12. The two chains of the DNA double helix are held together by ______.
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