BIOS E-1a exam 02 113011 KEY

BIOS E-1a exam 02 113011 KEY - Name: ANSWER KEY BIOLOGY...

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1 Name: ANSWER KEY BIOLOGY E-1a: Introduction to Molecular and Cellular Biology Fall 2011 EXAM 2 Teaching Fellow: ______________________________________________________ Be sure to write your name on the top of each of the pages of the exam. Write each answer only on the same page as the pertinent question. THE SPACE PROVIDED IS MEANT TO BE SUFFICIENT; BE BRIEF, BE CAREFUL, BE CONCISE! IF YOUR ANSWER CANNOT BE READ, IT CANNOT BE GRADED!!! All multiple choice questions may have more than one correct answer – as a result, all correct answers must be listed to receive credit. A codon table is included at the end to aid in answering some of the questions. Remember, if you do not show all your work, you cannot get partial credit. The point values for each question are noted. Allocate your time wisely. Read carefully, think before you write, good luck, and do well! IF YOU WRITE IN PENCIL, YOU CANNOT ASK FOR A REGRADE! Page 2 (05 pts.) Page 3 (06 pts.) Page 4 (10 pts.) Page 5 (12 pts.) Page 6 (15 pts.) Page 7 (12 pts.) Page 8 (14 pts.) Page 9 (17 pts.) Page 10 (09 pts.) Total (100 pts.)
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2 Questions 1-15 (multiple choice) are worth 1 point each. Questions 1-3 refer to the following mRNA sequence: 5’ – AUGGUUGAAUGG – 3’ _______________1. Using the codon table attached, the polypeptide sequence encoded by the mRNA shown above is: A) Gly-Lys-Leu-Val B) Met-Val-Glu-Trp C) Tyr-Gln-Leu-Thr D) Met-Val-Glu-Stop E) Gly-Lys-Leu-Stop _______________2. Using the mRNA above, what would be the sequence of the corresponding template strand of DNA? A) 5’ - ATGGTTGAATGG - 3’ B) 3’ - ATGGTTGAATGG - 5’ C) 5’ - TACCAACTTACC - 3’ D) 5’ - CCATTCAACCAT - 3’ E) 3’ - UACCAACUUACC - 5’ _______________3. A mutation occurs that changes the mRNA to the sequence below (change is highlighted via bold type and underlining). How would you classify this mutation? A) frameshift B) nonsense C) missense D) silent E) cannot be determined _______________4. A piece of linear double stranded DNA was determined to have a cytosine content of 24%. Which of the following statements is true of this DNA molecule? A) The DNA molecule contains 12% thymidine. B) The DNA molecule contains 24% thymidine. C) The DNA molecule contains 26% thymidine. D) The DNA molecule contains 52% thymidine. E) The base percent composition of thymidine cannot be determined from the information given. _______________5. A virus has been discovered and its genetic material has been analyzed. It has been found to contain 25% A, 20% G, 40% T and 15 % C. What type of genetic material does the virus likely contain? A) single stranded RNA B) single stranded DNA C) double stranded RNA D) double stranded DNA E) none of the above – the virus has a unique form of genetic material mRNA 5’ - AUGGU A GAAUGG - 3’
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3 _______________6. During mitotic anaphase, chromosomes migrate A) from the poles of the cell toward the equatorial plate. B) from the equatorial plate toward the poles.
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This note was uploaded on 02/09/2012 for the course BIOLOGY 102 taught by Professor Anderson during the Spring '11 term at Harvard.

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BIOS E-1a exam 02 113011 KEY - Name: ANSWER KEY BIOLOGY...

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