Exam: version 1
(day & time)
Questions 1-20 are multiple choice. Clearly WRITE your answer in the blanks provided.
Each question is worth 2 points (40 points total).
_____1. Today scientists theorize that life on Earth may have first arose:
a) from outer space by means of a meteor, comet, or asteroid.
b) by special creation.
c) spontaneously from nonliving organic molecules.
d) either A or C.
e) None of the above.
_____2. The first signs of life appeared on Earth about ____ years ago.
a) 10-20 billion b) 4.2 billion c) 3.7 billion d) 100 million e) 65 million
_____3. The most likely candidate molecule for the earliest the catalyst (building block) of life is:
a) DNA b) RNA c) protobionts d) liposomes e) cyanobacteria
_____4. Which of the following pieces of evidence
supports the common origin of all life
All organisms require energy
All organisms use essentially the same genetic code
All organisms reproduce
All organisms show heritable variation
All organisms have undergone evolution
_____5. Place the following events in order from earliest to latest:
Production of O
Synthesis of small organic molecules
Origin of self-replication
Packaging into “protobionts” with membranes
Joining of molecules into polymers
1, 2, 3, 4, 5
1, 2, 3, 5, 4
1, 2, 5, 4, 3
2, 3, 5, 4, 1
2, 5, 4, 3, 1
2, 5, 3, 4, 1
_____6. Suggestive evidence that Europa may have extraterrestrial life does
Evidence of several meteorite collisions
A stable environment
The presence of water
A reducing environment
A warm core