LIFE SCIENCE QUIZ (PERFECT ANSWER) 20 QUESTIONS
QUESTION 1
Oxygen built up in the atmosphere approximately 2 billion years ago and
A. destroyed ozone forming more oxygen.
B. occurred due to carbon dioxide being split by lightning strikes.
C. could not have occurred without the oxygen coming from outer space.
D. occurred because aerobic organisms required the oxygen.
E. helped to form the ozone layer that is so important to life today.
QUESTION 2
Which form of bacterial cells is rod shaped?
A. vibrios
B. bacilli
C. rhodius
D. cocci
E. spirilla
QUESTION 3
Most bacteria are
A. chemoautotrophs.
B. symbionts.
C. heterotrophs.
D. photoautotrophs.
E. microbial predators.
QUESTION 4
Rickettsias belong to which major group of bacteria?
A. spirochetes
B. Archaea
C. cyanobacteria
D. viruses
E. proteobacteria
QUESTION 5
What term is used to indicate a characteristic that is shared and inherited from a common ancestor?
A. homologous trait
B. cladistic trait
C. outgroups
D. derived trait
E. analogous trait
QUESTION 6
In bacteria, the cell wall is composed mainly of
A. peptidoglycans.
B. various polysaccharides.
C. glycoproteins.
D. lipids.
E. proteins.
QUESTION 7
Eukaryotic cells are thought to have
A. evolved before prokaryotic cells.
B. first appeared with tough cell walls.
C. first appeared as parts of multicellular organisms.
D. developed when mitochondria grew much larger in size that they had been previously.
E. appeared about 2.1 billion years ago.
QUESTION 8
Kelps are a form of what group of protists?
A. dinoflagellates
B. water molds
C. slime molds
D. brown algae
E. ciliates
QUESTION 9
Atmospheric chemists think that Earth’s first atmosphere
A. consisted of carbon in the form of carbon monoxide.
B. was very similar to today’s atmosphere.
C. contained no oxygen atoms.
D. consisted of carbon in the form of carbon dioxide.
E. contained nitrogen in the form of ammonia and nitrogen gas.
QUESTION 10
Prions are composed of
A. DNA, RNA, and protein.
B. RNA.
C. protein.
D. DNA and protein.
E. DNA.
QUESTION 11
Endospores form
A. to produce two offspring from every one parental cell.
B. as a means of genetic recombination.
C. when the environmental conditions are favorable.
D. in response to adverse conditions.
E. during binary fission.
QUESTION 12
Paleontologists have found fossils dating back 3.6 billion years. These closely resemble
A. fungi.
B. small invertebrate animals.
C. today’s simplest plants.
D. nothing alive today.
E. blue-green algae present today.
QUESTION 13
What is the main difference between protists and bacteria?
A. Bacteria have DNA, protists do not.
B. Protists cannot cause infections, bacteria can
C. Protists are unicellular, bacteria are multicellular.
D. Protists have a nucleus, bacteria do not
E. Bacteria are always gram-negative, protists are gram-positive
QUESTION 14
All but one of the following are false regarding protists. Identify the true statement.
Most protists are single-celled organisms; some are multicellular.
A. Protists have cell walls composed mainly of peptidoglycans.
B. Protists are prokaryotic.
C. Protists do not have the ability to move on their own.
D. All protists are single-celled organisms.
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