1
BIOS242: EXAM 2 REVIEW Questions
and Answers (100% Correct
Answers) Already Graded A+
Chemotrophs Ans: obtain energy from chemicals
© 2026 Assignment
Phototrophs Ans: obtain energy from sunlight
Guru01 - Stuvia
Heterotrophs Ans: obtain carbon from Organic Molecules
Expert
Autotrophs Ans: obtain carbon from Inorganic molecules
Photoautotroph Ans: An Organism gets its energy from
sunlight and its carbon from Inorganic Molecules. This
Organism would be termed what?
Chemoautotroph Ans: An Organism gets its energy from
chemicals and its carbon from Inorganic Molecules. What term
this Organism would be?
Photoheterotroph Ans: An Organism gets its energy from
sunlight and its carbon from Organic Molecules. What term
this Organism would be?
Chemoheterotroph Ans: An Organism Gets Their Energy From
Chemicals and Their Carbon From Organic Molecules. This
Organism Would Be Termed A(n)?
Saprobes Ans: Obtain Their Nutrients From Dead Organisms
, 2
Parasites Ans: Obtain Their Nutrition From Living Organisms
and Cause Harm to Their Host
Chemoheterotroph: Saprobe Ans: Metabolizing the organic
matter of dead organisms; examples Fungi and bacteria
(decomposers)
Chemoheterotroph: Parasite Ans: Utilizing the tissues and
fluids of a live host; examples: Various parasites and
pathogens; can be bacteria, fungi, protozoa, and animals
© 2026 Assignment
Temperature, Gases, pH, Osmotic pressure, and Hydrostatic
pressure Ans: Microbial Growth is Influenced by what
Guru01 - Stuvia
Environmental Factors?
Expert
Psychrophiles Ans: Have an Optimum Temperature below
15°C, are Capable of Growth at 0°C, and Cannot Grow Above
20°C
Psychrotolerant Ans: Organisms Grow Slowly in the Cold, But
Have an Optimum Temperature Between 15°C and 30°C
Mesophiles Ans: are the Majority of Medically Significant
Organisms.Most Human Pathogens Have Optimal Growth
Between 30°C and 40°C
Thermophiles Ans: Grow Optimally at Temperatures above
45°C. This Includes Compost Piles and Soil Around Volcanos.
Extreme Thermophiles Ans: Grow Between 80°C and 121°C
Obligate Aerobe Ans: Requires oxygen and cannot survive
without it
, 3
Facultative Anaerobe Ans: Uses oxygen but can survive
without it
Aerotolerant Anaerobe Ans: Does not use oxygen but can
grow in its presence
Obligate Anaerobe Ans: Unable to use oxygen and cannot
survive if it is present
Microaerophile Ans: Uses oxygen but only at very low
© 2026 Assignment
concentrations
Acidophiles Ans: Require an acidic environment for growth
Guru01 - Stuvia
(below pH 6). Molds and yeasts tolerate acid
Expert
Alkalinophiles Ans: Live in a pH above 8. Live in hot pools
and soils
Neutrophile Ans: Grow in habitats between pH 6 and 8
Halophiles (Osmotic Pressure) Ans: Prefer high
concentrations of salt for growth
Barophiles (Atmospheric Pressure) Ans: Deep sea microbes
that exist in pressures up to 1,000 times atmospheric pressure.
REQUIRE high pressure
Symbiotic Ans: Organisms live in close nutritional
relationships; required by one or both members. Examples:
mutualism, commensalism, parasitism
Nonsymbiotic Ans: organisms are free-living; relationships
not required for survival. Examples: synergism and
Antagonism
BIOS242: EXAM 2 REVIEW Questions
and Answers (100% Correct
Answers) Already Graded A+
Chemotrophs Ans: obtain energy from chemicals
© 2026 Assignment
Phototrophs Ans: obtain energy from sunlight
Guru01 - Stuvia
Heterotrophs Ans: obtain carbon from Organic Molecules
Expert
Autotrophs Ans: obtain carbon from Inorganic molecules
Photoautotroph Ans: An Organism gets its energy from
sunlight and its carbon from Inorganic Molecules. This
Organism would be termed what?
Chemoautotroph Ans: An Organism gets its energy from
chemicals and its carbon from Inorganic Molecules. What term
this Organism would be?
Photoheterotroph Ans: An Organism gets its energy from
sunlight and its carbon from Organic Molecules. What term
this Organism would be?
Chemoheterotroph Ans: An Organism Gets Their Energy From
Chemicals and Their Carbon From Organic Molecules. This
Organism Would Be Termed A(n)?
Saprobes Ans: Obtain Their Nutrients From Dead Organisms
, 2
Parasites Ans: Obtain Their Nutrition From Living Organisms
and Cause Harm to Their Host
Chemoheterotroph: Saprobe Ans: Metabolizing the organic
matter of dead organisms; examples Fungi and bacteria
(decomposers)
Chemoheterotroph: Parasite Ans: Utilizing the tissues and
fluids of a live host; examples: Various parasites and
pathogens; can be bacteria, fungi, protozoa, and animals
© 2026 Assignment
Temperature, Gases, pH, Osmotic pressure, and Hydrostatic
pressure Ans: Microbial Growth is Influenced by what
Guru01 - Stuvia
Environmental Factors?
Expert
Psychrophiles Ans: Have an Optimum Temperature below
15°C, are Capable of Growth at 0°C, and Cannot Grow Above
20°C
Psychrotolerant Ans: Organisms Grow Slowly in the Cold, But
Have an Optimum Temperature Between 15°C and 30°C
Mesophiles Ans: are the Majority of Medically Significant
Organisms.Most Human Pathogens Have Optimal Growth
Between 30°C and 40°C
Thermophiles Ans: Grow Optimally at Temperatures above
45°C. This Includes Compost Piles and Soil Around Volcanos.
Extreme Thermophiles Ans: Grow Between 80°C and 121°C
Obligate Aerobe Ans: Requires oxygen and cannot survive
without it
, 3
Facultative Anaerobe Ans: Uses oxygen but can survive
without it
Aerotolerant Anaerobe Ans: Does not use oxygen but can
grow in its presence
Obligate Anaerobe Ans: Unable to use oxygen and cannot
survive if it is present
Microaerophile Ans: Uses oxygen but only at very low
© 2026 Assignment
concentrations
Acidophiles Ans: Require an acidic environment for growth
Guru01 - Stuvia
(below pH 6). Molds and yeasts tolerate acid
Expert
Alkalinophiles Ans: Live in a pH above 8. Live in hot pools
and soils
Neutrophile Ans: Grow in habitats between pH 6 and 8
Halophiles (Osmotic Pressure) Ans: Prefer high
concentrations of salt for growth
Barophiles (Atmospheric Pressure) Ans: Deep sea microbes
that exist in pressures up to 1,000 times atmospheric pressure.
REQUIRE high pressure
Symbiotic Ans: Organisms live in close nutritional
relationships; required by one or both members. Examples:
mutualism, commensalism, parasitism
Nonsymbiotic Ans: organisms are free-living; relationships
not required for survival. Examples: synergism and
Antagonism
