BL1020 Midterm Practice
Questions With Answers
Which gas began to increase in the atmosphere as a result of photosynthesis
by autotrophic prokaryotes approximately 2.7 billion years ago?
A) hydrogen
B) carbon dioxide
C) methane
D) oxygen - ANSWER D) oxygen
From what can pre-cells spontaneously form?
A) ribozymes
B) fatty acids
C) DNA
D) RNA - ANSWER B) fatty acids
Recent scientific studies of the impact of microbiota on the amount of fat
versus lean body mass (i.e., body composition) are described in your text.
How do those studies illustrate the importance of microbiota communities in
our bodies?
A) The study suggest that mice are an unreliable model organism to use for
studies of human intestinal microbiota and obesity
B) the studies suggest that intestinal microbiota may be involved in
,regulating our digestive processes
C) if transferred to lean humans, intestinal microbiota of obese humans will
cause obesity
D) if transferred to obese humans, intestinal microbiota in lean humans will
cause exaggerated obesity - ANSWER B) the studies suggest that intestinal
microbiota may be involved in regulating our digestive processes
Trichomonas vaginalis is a protozoan that feeds on white blood cells and
bacteria living on the cells lining the female human vagina, thereby creating a
common sexually transmitted disease often known as "trich". The feeding
mechanism of this protozoan makes it a ____________.
A) parasite
B) producer
C) autotroph
D) mixotroph - ANSWER A) parasite
In the soil, some _________ help to decompose dead organisms and other
waste materials, returning vital chemical elements such as nitrogen to the
environment
A) pre-cells
B) protozoans
C) prokaryotes - ANSWER C) prokaryotes
Which group of prokaryotes aids digestion in cattle, deer, and other animals
that obtain nutrition from cellulose?
,A) dinoflagellates
B) cocci
C) halophiles
D) methanogens - ANSWER D) methanogens
Scientists hypothesize that disrupting our __________ communities may
increase our susceptibility to infectious diseases, predispose us to certain
cancers, and contribute to conditions such as asthma and other allergies,
irritable bowel syndrome, crohn's disease, and autism
A) plant
B) pathogen
C) protist
D) microbial - ANSWER D) microbial
Why is RNA thought to have been the first genetic material?
A) RNA is capable of self-replication
B) RNA has been found on meteorites
C) RNA is structurally simpler than DNA - ANSWER A) RNA is capable of
self-replication
In Yellowstone national park, hot springs can reach temperatures of 205F
(96C). Despite these high temperatures, aquifex bacteria flourish. How might
one best classify aquifex bacteria?
A) amoebas
, B) slime molds
C) algae
D) extremophiles - ANSWER D) extremophiles
spherical bacteria that occur in clusters are ________
A) spirochetes
B) staphylococci
C) bacilli
D) streptococci - ANSWER B) staphylococci
Which group of organisms colonized land during the Paleozoic era
approximately 500 million years ago?
A) bacteria, plants, and fungi
B) plants, fungi, and insects
C) plants, protists, and insects
D) protists, bacteria, and fungi - ANSWER B) plants, fungi, and insects
Eukaryotes arose about ______ years after the first prokaryotes.
A) 1.7 billion
B) 3.5 billion
C) 3.0 billion
Questions With Answers
Which gas began to increase in the atmosphere as a result of photosynthesis
by autotrophic prokaryotes approximately 2.7 billion years ago?
A) hydrogen
B) carbon dioxide
C) methane
D) oxygen - ANSWER D) oxygen
From what can pre-cells spontaneously form?
A) ribozymes
B) fatty acids
C) DNA
D) RNA - ANSWER B) fatty acids
Recent scientific studies of the impact of microbiota on the amount of fat
versus lean body mass (i.e., body composition) are described in your text.
How do those studies illustrate the importance of microbiota communities in
our bodies?
A) The study suggest that mice are an unreliable model organism to use for
studies of human intestinal microbiota and obesity
B) the studies suggest that intestinal microbiota may be involved in
,regulating our digestive processes
C) if transferred to lean humans, intestinal microbiota of obese humans will
cause obesity
D) if transferred to obese humans, intestinal microbiota in lean humans will
cause exaggerated obesity - ANSWER B) the studies suggest that intestinal
microbiota may be involved in regulating our digestive processes
Trichomonas vaginalis is a protozoan that feeds on white blood cells and
bacteria living on the cells lining the female human vagina, thereby creating a
common sexually transmitted disease often known as "trich". The feeding
mechanism of this protozoan makes it a ____________.
A) parasite
B) producer
C) autotroph
D) mixotroph - ANSWER A) parasite
In the soil, some _________ help to decompose dead organisms and other
waste materials, returning vital chemical elements such as nitrogen to the
environment
A) pre-cells
B) protozoans
C) prokaryotes - ANSWER C) prokaryotes
Which group of prokaryotes aids digestion in cattle, deer, and other animals
that obtain nutrition from cellulose?
,A) dinoflagellates
B) cocci
C) halophiles
D) methanogens - ANSWER D) methanogens
Scientists hypothesize that disrupting our __________ communities may
increase our susceptibility to infectious diseases, predispose us to certain
cancers, and contribute to conditions such as asthma and other allergies,
irritable bowel syndrome, crohn's disease, and autism
A) plant
B) pathogen
C) protist
D) microbial - ANSWER D) microbial
Why is RNA thought to have been the first genetic material?
A) RNA is capable of self-replication
B) RNA has been found on meteorites
C) RNA is structurally simpler than DNA - ANSWER A) RNA is capable of
self-replication
In Yellowstone national park, hot springs can reach temperatures of 205F
(96C). Despite these high temperatures, aquifex bacteria flourish. How might
one best classify aquifex bacteria?
A) amoebas
, B) slime molds
C) algae
D) extremophiles - ANSWER D) extremophiles
spherical bacteria that occur in clusters are ________
A) spirochetes
B) staphylococci
C) bacilli
D) streptococci - ANSWER B) staphylococci
Which group of organisms colonized land during the Paleozoic era
approximately 500 million years ago?
A) bacteria, plants, and fungi
B) plants, fungi, and insects
C) plants, protists, and insects
D) protists, bacteria, and fungi - ANSWER B) plants, fungi, and insects
Eukaryotes arose about ______ years after the first prokaryotes.
A) 1.7 billion
B) 3.5 billion
C) 3.0 billion
