BIOL 2261 Chapter 6: Microbial Growth Questions With
Complete Solutions
Acidophiles Correct Answer Acidic environments
Aerotolerant anaerobes Correct Answer Tolerate but cannot
use oxygen
Agar Correct Answer A gel-like complex polysaccharide used
as a solidifying agent for culture media in Petri plates, slants,
and deeps
-Liquefies at 100° C
-Solidifies at 40° C
Anaerobes Correct Answer Bacteria that are unable to use
molecular oxygen for energy-yielding reactions
Bacterial growth Correct Answer An increase in number of
cells, not cell size
Binary fission Correct Answer The most common form or
reproduction of bacteria; the division of one cell into two
daughter cells
Biofilms Correct Answer Microbial communities that form a
thin, slimy layer encasing bacteria that adheres to a surface
(hydrogels)
Biosafety Level 1 (BSL-1) Correct Answer No special
precautions; basic teaching labs
, Biosafety Level 2 (BSL-2) Correct Answer Lab coat, gloves,
eye protection
Biosafety Level 3 (BSL-3) Correct Answer Biosafety cabinets
to prevent airborne transmission
Biosafety Level 4 (BSL-4) Correct Answer Sealed, negative
pressure; "hot zone"
-Exhaust air is filtered twice through HEPA filters
Budding Correct Answer A form of reproduction in which a
small initial outgrowth (a bud) enlarges until its size approaches
that of the parent cell, and then it separates
Capnophiles Correct Answer Microbes that require high CO2
conditions
Chemical requirements for microbial growth Correct Answer
-Carbon
-Nitrogen, sulfur, and phosphorus
-Trace elements
-Oxygen
-Organic growth factors
Chemically defined media Correct Answer Exact chemical
composition is KNOWN
-Fastidious organisms are those that require many growth factors
provided in chemically defined media
Colony Correct Answer A population of cells arising from a
single cell or spore or from a group of attached cells
Complete Solutions
Acidophiles Correct Answer Acidic environments
Aerotolerant anaerobes Correct Answer Tolerate but cannot
use oxygen
Agar Correct Answer A gel-like complex polysaccharide used
as a solidifying agent for culture media in Petri plates, slants,
and deeps
-Liquefies at 100° C
-Solidifies at 40° C
Anaerobes Correct Answer Bacteria that are unable to use
molecular oxygen for energy-yielding reactions
Bacterial growth Correct Answer An increase in number of
cells, not cell size
Binary fission Correct Answer The most common form or
reproduction of bacteria; the division of one cell into two
daughter cells
Biofilms Correct Answer Microbial communities that form a
thin, slimy layer encasing bacteria that adheres to a surface
(hydrogels)
Biosafety Level 1 (BSL-1) Correct Answer No special
precautions; basic teaching labs
, Biosafety Level 2 (BSL-2) Correct Answer Lab coat, gloves,
eye protection
Biosafety Level 3 (BSL-3) Correct Answer Biosafety cabinets
to prevent airborne transmission
Biosafety Level 4 (BSL-4) Correct Answer Sealed, negative
pressure; "hot zone"
-Exhaust air is filtered twice through HEPA filters
Budding Correct Answer A form of reproduction in which a
small initial outgrowth (a bud) enlarges until its size approaches
that of the parent cell, and then it separates
Capnophiles Correct Answer Microbes that require high CO2
conditions
Chemical requirements for microbial growth Correct Answer
-Carbon
-Nitrogen, sulfur, and phosphorus
-Trace elements
-Oxygen
-Organic growth factors
Chemically defined media Correct Answer Exact chemical
composition is KNOWN
-Fastidious organisms are those that require many growth factors
provided in chemically defined media
Colony Correct Answer A population of cells arising from a
single cell or spore or from a group of attached cells
