Practice_questions_for_Exam_2_key

Practice_questions_for_Exam_2_key - 5. 3) The RNAs of all...

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Practice questions (these are some sample questions from a previous exam): The composition of one of the strands of a double-helical DNA is [A] = 30%, and [G] = 24%. Calculate the composition of particular bases on the same strand (i.e. the strand that contains: [A] = 30%, and [G] = 24%). 1. (1 pt) [T] = 1) 24% 2) 30% 3) 46% 4) 54% 5) impossible to calculate 2. (1 pt) [C] = 1) 24% 2) 30% 3) 46% 4) 54% 5) impossible to calculate 3. (1 pt) [T] + [C] = 1) 24% 2) 30% 3) 46% 4) 54% 5) impossible to calculate 4. A conclusion from his (their) experiments was that DNA, not protein, was the genetic material. 1) Severo Ochoa 2) Nirenberg and Leder 3) Sir Archibald Garrod 4) Beadle and Tatum 5) Hershey and Chase 5. Which of the following is TRUE regarding transcription? 1)RNAs of different genes can be transcribed off either DNA strand of the double helix, the RNA is always synthesized 5´ 3´. 2) RNAs of different genes can be transcribed off either DNA strand of the double helix, RNA is always synthesized 3´
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Unformatted text preview: 5. 3) The RNAs of all genes are always synthesized 5 3 off the same DNA strand of the double helix. 4) The RNAs of all genes are always synthesized 3 5 off the same DNA strand of the double helix. 5) Different genes can be transcribed off either strand of the double helix, for this reason some RNA are synthesized in the 5 3 direction and some are synthesized in the 3 5 direction. 6. Consider the sugar molecule pictured. a) What is the name of the sugar pictured? _____deoxyribose_____________ b) Circle and label the carbon that a nitrogenous base would be bound to. c) Circle and label the carbons that phosphate groups would be bound to in a polynucleotide chain. 7. The yeast tRNA Ala has the anticodon sequence 3 CGI 5 (where I = inosine which by wobble rules can base pair with U, C, or A). List all codons this tRNA Ala can recognize (label 5 and 3 ends): 5 GCU 3 5 GCC 3 5 GCA 3...
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