EESA06H3 Quiz: EESA06 Quiz 5.docx

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ceruleansardine81

4 Mar 2012

School

UTSC

Department

Environmental Science

Course

EESA06H3

Professor

Nick Eyles

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Quiz 5: life on earth lecture, no chapters in textbook - regarding lisa"s guest lecture. 52 minutes, and 10 seconds out of 1 hour. Chimps and humans split about ____ million years ago. Fossils can be used for absolute age dating only. Correct answer: the way the eyes pointed when the skull fit on the spinal column. Life most likely originated around hot spots on the ocean floor. Please match the following terms with their best definition from the list. Prokaryotes: single celled bacteria lacking a nucleus. Eukaryotes: singular or multicellular bacteria that have a nucleus. Protists: single celled eukaryotic bacteria with thick, protective walls. Chemosynthesis: a mechanism of using chemicals for energy generation. Photosynthesis: a mechanism of generating energy from sunlight. Chordates: having a backbone (or at least a notochord) during some part of their lives. Early life and the formation of an atmosphere and oceans on earth may have been prevented by:

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Carol holds a two-digit number X and wants Alice and Bob to recover the number. She gives them the following information.

Both Alice and Bob know that the number held by Carol is one of the following.

21 26
31 32 35
42 44
52 54 57
62 67

Alice knows the number of ones of X but not the number of tens.
Bob knows the number of tens of X but not the number of ones.

Alice and Bob exchange the following messages.

(a) Bob to Alice: ’You might know X’.
(b) Alice to Bob: ’I did not, but, after what you have said, I do’.

Based on the above information, please answer the following questions. For each question, please accompany your answer with a short explanation of why your believe your answer is correct. Marks will not be awarded for answers without any explanation.

(a) Based on the statement of Bob it is possible to narrow down candidates for the number of tens from the initial five possibilities down to just two. What are these two possibilities? (7 marks)
(b) Based on the ’I did not’ statement of Alice, the number of candidates for X can be narrowed down to just three. What are these candidates (6 marks)
(c) The remaining part of Alice’s statement allows to identify X precisely. What is X? (7 marks)

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EESA06H3 Quiz: EESA06 Quiz 5.docx

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