1.Big Bang theory occur

a.10-15 BYA

b.10-18BYA

c.10-20BYA

2.Hydrogen and _ main elements in the early universe.

a.Oxygen

b.Nitrogen

c.Helium

3.Earth roughly _ billion years old.

a.4.7

b.4.8

c.4.9

4.Earth crust becomes stable by

a.3.7BYA

b.3.8BYA

c.3.9BYA

5.Life appears around _ billion years ago.

a.3.5-3.6

b.3.6-3.7

c.3.7-3.8

6.Anaerobic bacteria

a.require free oxygen

b.does not require free oxygen

c.both

7.Heterotrophic bacteria are

a.does not make its own food

b.make its own food

c.none

8. _ billion years ago oxygen forming photosynthesis.

a.2.5

b.2.6

c.2.7

9.Aerobic respiration

a.~2.1BYA

b.~2.2BYA

c.~2.3BYA

10. First evidence of fossil eukaryotes

a.~1.4BYA

b.~1.5BYA

c.~1.6BYA

11.Turning CO2 + _ into organic molecules.

a.H

b.He

c.O

12.Use of _ as a hydrogen donor.

a.CO2

b.H2O

C.H2S

13.Early cells arranged in a filament

a.3.5BYA

b.3.6BYA

c.3.7BYA

14.Stromatolites

a.2.5BYA

b.2.6BYA

c.2.7BYA

15.Stromatolites fossil from

a.America

b.warawoona

c.Africa

16.Intact Stromatolites present today in

a.Shark’s Bay

b.dolphin

c.alligator

17.DNA is the genetic material,but it requires _ to replicate.

a.proteins

b.RNA

c.lipids

18. Nucleosynthesis in stars to form complex

a.elements

b.molecules

c.compounds

19.DNA synthesis requires

a.RNA primer

b.protein

c.lipids

20. _ used in protein synthesis.

a.RNA

b.DNA

c.both