Biology 1406 Discipline Final Exam: Fall 2013 Do not write on this exam all answ

Question

Biology 1406 Discipline Final Exam: Fall 2013 Do not write on this exam all answers on the scantron 48. Why are viruses referred to as obligate intracellular parasites? a. They invariably kill any cell they infect b. They cannot reproduce c. They can incorporate nucleic acids from other viruses d. Viral DNA always inserts itself into host DNA e. They must use enzymes of a host cell ed by the virus itself 49. You isolate the following plasmid EcoRI EcoRI You cut the DNA to completion with and run it on a gel. Which of the lanes on the gel contains your sample? enzyme EcoRI at the positions indicated A B CD E a. Lane A b. Lane B c. Lane C d. Lane D e. Lane E Please answer question #50 in the essay section of your 886-E mini essay scranton sheet. Answers written on this exam will NOT be graded. 50. Using your knowledge of cellular respiration, explain what happens inside a human skin cell as it runs out of oxygen and die

Explanation / Answer

37 c 6

Parents AaBb x AABb

AaBb produces four types of gametes AB, Ab, aB, ab

AABb gametes produced will be of two types AB, Ab

So possible combinations of genotypes

Thus 1 AABB; 2 AaBb; 2 AABb, 1 AAbb, 1AaBB, 1 Aabb

Total different genotypes are 6

45 c 3'- AAA-TAA-CAA-5'

DNA template strand polarity is 3'-5'

So mRNA will be 5'-UUU-AUU-GUU-3'

47. a The Ras protein is more hyperactive after age 60

Mutations in ras genes is associated with cancers. Ras proteins are essential components of signaling networks controlling cellular proliferation, differentiation or survival

49. The circular has 2 sites for restriction enzyme EcoRi, so it will get cut into 2 dna fragments

So correct answer is a. Lane A

50. Oxygen is needed for aerobic respiration. In cell oxidation of glucose occurs that produces carbon dioxide, ATP and water. Therefore oxygen deprived cells dies as oxygen is required as the final electron acceptor and ATP produced is the basis of life

AABB AABb AaBB AaBb AABb AAbb AaBb Aabb

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