Solution to Midterm #2

Q1A on Form A

Q3C on Form B

(/10)

5 marks for each of the following mentioned:

1. some amino acids found in the meteorite is not present in Earth life

2. no serine was found in the Murchison (indicative of human handling)

3. equal amounts of left- and right-handed molecules

4. carbon isotope ratios were different than in living creatures

Q1B on Form A

Q3A on Form B

(/10)

5 marks for each of the following mentioned

1. iridium spike

2. shocked quartz

3. Yucatan crater

Q1C on Form A

Q3B on Form B

(/5)

1. 2/3 of earth is covered by ocean

2. plate tectonics

3. erosion

Q2A on Form A

Q4C on Form B

(/18)

You need to mention specifics for full marks

Also, sulfuric clouds in Venus, winds on Mars.

Q2B on Form A

Q4B on Form B

(/3)

Venus

Q2C on Form A

Q4A on Form B

(/4)

GCMS failed to find evidence for ogranic material to 1 part in a billion

Q3A on Form A

Q1D on Form B

(/6)

3 marks for each of the following mentioned

1. shape of microfossile

2. fossil stromatolites with structures similar to extent life

3. carbon isotope ratios

Q3B on Form A

Q1D on Form B

(/7)

2 billion years ago

photosynthesis

O2 is not an important greenhouse gas

Q3C on Form A

Q1A on Form B

(/6)

O2 is not essential for life

there are things like methanogens who do not use O2 to respirate

Q3D on Form A

Q1C on Form B

(/6)

CH4 is an important greenhouse gas

CH4 is not relevant in photosynthesis

Q4A on Form A

Q2A on Form B

(/10)

the oxygen released by organisms doing photosynthesis oxidized iron to make the banded iron formations

they were laid down before 2 Byrs ago

Q4B on Form A

Q2B on Form B

(/9)

2 marks each for an organism with magnetic material

3 marks for explaining that they use it as a navigation tool by aligning with the Earth's mag. Field

Q4C on Form A

Q2C on Form B

(/6)

2 marks each for

1. very pure

2. single domain crystal

3. hexagonal strucutre