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Chatrs 14-15
Test Description: Bio chps and stuff
Instructions: Answer all questions to get your test result.
1) Spontaneous generation has been offered as an explination for
A
the germination of a seed
B
the birth of live offspring from a mother
C
all
D
the appearence of maggots on rotting meat
2) What did Pasteur do in his experiments on spontaneous generation that other scientist before him had not?
A
he added microorganisms to the broth before he boiled it
B
he used curved-necked flasks and left them open
C
he sealed his flasks
D
he boiled the broth in his flasks
3) The age of Earth is estimated to be
A
2 billion years old
B
2 million years old
C
4 billion years old
D
2 trillion years old
4) If the half-life of a radioactive isotope is 5,000 years, how much of the radioactive isotope in a specimen will be left after 10,000 years?
A
one-quarter of the original amount
B
all of it
C
on-half of the original amount
D
none of it
5) Isotopes are forms of the same element that differ in
A
number of electrons
B
atomic number
C
number of protons
D
number of neutrons
6) Miller and Urey did not use oxygen gas in their apparatus because oxygen
A
was believed not to have been present in Earth's early atmosphere
B
would have led to the formation of microorganisms
C
does not react with ammonia, methane, or hydrogen
D
is not essentail to most forms of life
7) RNA
A
probably evolved before DNA
B
can undergo natural selection
C
all
D
was probably the first genetic molecule
8) RNA
A
is a nucleic acid
B
has a three dimensional structure
C
can act like an enzyme
D
all
9) Scientist think that the first cells resembled modern
A
chloroplasts
B
archaebacteria
C
animal cells
D
mitochondria
10) Which of the following is true difference between photosynthetic organisms and chemosynthetic organisms?
A
They differen in the source of energy
B
Photos are eukaryotic, chemos are prokaryotic
C
They differ in the source of carbon
D
Photos can be found, chemos cannot
*select an answer for all questions
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