MBIO 3401 EXAM 3 | PRINCIPLES OF
MICROBIOLOGY EXAM |80 QUESTIONS AND
CORRECT ANSWERS (DETAILED ANSWERS) |
LATEST EXAM 2025 | GRADED A+
The algal and fungal interaction within a lichen is best described
as
a)mutualism.
b)synergism.
c)commensalism.
d)amensalism.
e)parasitism.
a)mutualism
All of the following statements about food webs in ecosystems
are true EXCEPT:
a)Primary producers assimilate minerals into biomass.
b)Primary producers absorb energy from outside the ecosystem.
c)Grazers convert 10% of producer carbon back to CO2.
,d)Consumers convert 90% of biomass carbon to atmospheric
CO2.
e)All biomass is recycled and eventually converted to heat.
c)Grazers convert 10% of producer carbon back to CO2.
All of the following statements about Rubisco are true EXCEPT
a)It is found in carboxysomes in many bacteria.
b)It is one of the most prevalent proteins on Earth.
c)It consists of small (S) and large (L) subunits.
d)It catalyzes the addition of CO2 to xylulose 5 phosphate.
d) It catalyzes the addition of CO2 to xylulose 5 phosphate.
Ameboid movement is controlled by
a)cytoplasmic streaming into the extending pseudopodia.
b)paired flagella formations extending off of the cell membrane.
c)cilia structures surrounding the cell.
d)regulation of osmotic and gas vacuoles within the cytoplasm.
e)barophilic pumps within the cell membrane.
,a)cytoplasmic streaming into the extending pseudopodia.
Archaea of the genus _______ are known as double extremophiles,
because they require high temperature and high acidity
simultaneously.
a) Sulfolobus
b) Desulfurococcus
c) Ignicoccus
d) Thermosphaera
e) Pyrodictium
a) Sulfolobus
As artic permafrost thaws, it accelerates the microbial
decomposition of dead plant matter. This process increases
radiative forcing by releasing methane into the atmosphere.
Therefore, in this environment:
a)The metabolic output of methanogens must be greater than
that of methanotrophs.
b)The metabolic output of methanotrophs must be greater than
that of methanogens.
, c)The metabolic output of methanogens must be greater than
that of bacterial and fungal decomposers.
d)There is not enough information to answer this question.
a)The metabolic output of methanogens must be greater than
that of methanotrophs.
A bacterial phylum is a group of organisms that share a common
ancestor that diverged early from other bacteria, which is based
on
a)16S ribosomal RNA sequences.
b)the presence of certain plasmids.
c)the size of the genome.
d)having 70S or 80S ribosomes.
e)the presence or absence of a cell wall.
a)16S ribosomal RNA sequences
The causative agent of African sleeping sickness is
a) Candida albicans.
b) Leishmania major.
MICROBIOLOGY EXAM |80 QUESTIONS AND
CORRECT ANSWERS (DETAILED ANSWERS) |
LATEST EXAM 2025 | GRADED A+
The algal and fungal interaction within a lichen is best described
as
a)mutualism.
b)synergism.
c)commensalism.
d)amensalism.
e)parasitism.
a)mutualism
All of the following statements about food webs in ecosystems
are true EXCEPT:
a)Primary producers assimilate minerals into biomass.
b)Primary producers absorb energy from outside the ecosystem.
c)Grazers convert 10% of producer carbon back to CO2.
,d)Consumers convert 90% of biomass carbon to atmospheric
CO2.
e)All biomass is recycled and eventually converted to heat.
c)Grazers convert 10% of producer carbon back to CO2.
All of the following statements about Rubisco are true EXCEPT
a)It is found in carboxysomes in many bacteria.
b)It is one of the most prevalent proteins on Earth.
c)It consists of small (S) and large (L) subunits.
d)It catalyzes the addition of CO2 to xylulose 5 phosphate.
d) It catalyzes the addition of CO2 to xylulose 5 phosphate.
Ameboid movement is controlled by
a)cytoplasmic streaming into the extending pseudopodia.
b)paired flagella formations extending off of the cell membrane.
c)cilia structures surrounding the cell.
d)regulation of osmotic and gas vacuoles within the cytoplasm.
e)barophilic pumps within the cell membrane.
,a)cytoplasmic streaming into the extending pseudopodia.
Archaea of the genus _______ are known as double extremophiles,
because they require high temperature and high acidity
simultaneously.
a) Sulfolobus
b) Desulfurococcus
c) Ignicoccus
d) Thermosphaera
e) Pyrodictium
a) Sulfolobus
As artic permafrost thaws, it accelerates the microbial
decomposition of dead plant matter. This process increases
radiative forcing by releasing methane into the atmosphere.
Therefore, in this environment:
a)The metabolic output of methanogens must be greater than
that of methanotrophs.
b)The metabolic output of methanotrophs must be greater than
that of methanogens.
, c)The metabolic output of methanogens must be greater than
that of bacterial and fungal decomposers.
d)There is not enough information to answer this question.
a)The metabolic output of methanogens must be greater than
that of methanotrophs.
A bacterial phylum is a group of organisms that share a common
ancestor that diverged early from other bacteria, which is based
on
a)16S ribosomal RNA sequences.
b)the presence of certain plasmids.
c)the size of the genome.
d)having 70S or 80S ribosomes.
e)the presence or absence of a cell wall.
a)16S ribosomal RNA sequences
The causative agent of African sleeping sickness is
a) Candida albicans.
b) Leishmania major.
