What is Life

Question 1

What are the critical properties shared by all living things

Answer 1

1. Order
2. Sensitivity or response to stimuli
3. Reproduction
4. Growth and development
5. Regulation
6. Homeostasis
7. Energy processing

Question 2

What are the 3 domains

Answer 2

1. Bacteria
2. Archaea
3. Eukarya

Question 3

What is the origin of living cells

Answer 3

1. Nucleotides and amino acids
2. Nucleotides and amino acids polymerized to form DNA, RNA, and proteins
3. Polymers became enclosed in membranes
4. Polymers enclosed in membranes aquired cellular properties

Question 4

What are the major transitions

Answer 4

1. Prokaryotic cells appear
2. The origin of eukaryotes- cells that house organelles and nuclei
3. The origin of multicellularity- organisms made up of >1 cell

Question 5

Prokaryote

Answer 5

-Cell size:1-10 um
-Unicellular
-Free floating circular DNA
-No organelles

Question 6

Eukaryote

Answer 6

-Cell size: 10-100 um
-Most multicellular
-Membrane bound nucleus contains DNA
-Organelles

Question 7

Evolution may result from environmental changes in earth’s history

Answer 7

1. Atmosphere
2. Climate/temperature
3. Floods
4. Glaciations
5. Land masses
6. Volcanic eruptions
7. Meteoric impacts

Question 8

Atmospheric O2

Answer 8

-Little oxygen in earth’s early atmosphere
-Cyanobacteria produce oxygen as a byproduct of photosynthesis
-Allowed the evolution of aerobic species, but caused the extinction of many anaerobic species

Question 9

Land mass variation through time

Answer 9

1. Pre Paleozoic Period (543 mya)
2. Paleozoic Period (248 mya)
3. Mesozoic Period (65 mya)
4. Cenozoic Period (present day)

Question 10

Define continental drift

Answer 10

The movement of lithospheric plates

Question 11

The Fossil Record

Answer 11

-Fossils provide evidence of the history of life
-Geologic layers preserve different time periods
-Species assemblages vary greatly by time period