T9 - Origins of Life

Question 1

What are the two Precambrian eons?

Answer 1

Archaean and Proterozoic

Question 1

What are the 6 features that characterize life?

Answer 1

1. organization
2. metabolism
3. response to stimuli
4. homeostasis
5. adaptation
6. reproduction

Question 2

What are the three eras within the Phanerozoic eon?

Answer 2

Paleozoic, Mesozoic, and Cenozoic

Question 3

What factors increase the likelihood of an organism being fossilized?

Answer 3

• long-term existence
• abundance and widely-spread
• hard-bodied
• aquatic
• inshore marine
• less decomposing

Question 4

types of fossil records

Answer 4

cast: filled with minerals
replacement: tissue to minerals
trace: evidence of behaviour
reserved: retention or the original organic material

Question 5

What are the 3 main results of the continental drift?

Answer 5

1. Pangaea
2. biodiversity
3. widely-spread fossils

Question 6

What three phenomena result in adaptive radiation?

Answer 6

1. mass extinctions
2. evolution of novel characteristics
3. colonization of new regions

Question 7

What are the three stages of the production of self-replicating molecules?

Answer 7

1. abiotic systhesis of inorganic molecules to organic molecules
2. organic molecules –> polymers
3. polymers –> protocells
4. self-replicating

Question 8

What are the three characteristics of prokaryotes (bacteria and archaea)?

Answer 8

• single-celled
• DNA is not contained in nucleus
• lack membrane-bound organelles