Origins of Life and Viruses
True and False Questions
Monomers which have now been synthesized in the laboratory include sugars, all of the amino acids, and many essential vitamins.
Little ultraviolet light reached the surface of the early earth before photosynthesis appeared.
The surfaces of clay particles are likely places for spontaneous polymerization to occur.
A virus is a good model of a self-reproducing system, and it can easily replicate itself, all by itself.
Cyanobacteria are known from about 3.5 billion years ago.
Multiple Choice Questions - Choose the best available answer.
The genetic materialof viruses can be
b) DNA, but not RNA
c) RNA, but not DNA
d) DNA or RNA
The infectious agent that leads to AIDS belongs to which group?
The first serious proposals concerning the spontaneous origin of life came more than fifty years ago from the Scottish scientist and Russian scientist
a) Haldane and Fox
b) Haldane and Oparin
c) Miller and Urey
d) Urey and Fox
The simulated primitive atmosphere of the Urey-Miller experiment included all the following except
c) water vapor
d) free oxygen
Oparin's model included the formation of crude membrane-surrounded droplets called
d) thin soup
Some estimates suggest that the earth took form approximately how many years ago?
a) 4.6 billion
b) 46 million
c) 4.6 million
Which of the following was probably not present in the primitive atmosphere of the earth?
b) ultraviolet light
d) carbon dioxide
Some scientists believe that self-perpetuating, genetic systems arose first and that these were probably in the form of
b) amino acids
c) DNA or RNA
Primitive autotrophs of today obtain their energy from
b) hydrogen sulfide
c) other organisms
d) DNA or RNA
Photosynthesis by the early cyanbacteria led to a substanial increase in the amount of which of the following, in the earth's atmosphere?
a) hydrogen sulfide
c) carbon dioxide
An increased level of oxygen in the atmosphere would be toxic to
a) anaerobic organisms
c) most photoautotrophs
You have: answers correct out of a possible eighteen.
The question numbers that were not correct are:
Instructor: Professor Clyde Herreid, firstname.lastname@example.org