BIOL 351 LAB EXAM 1 TAMU Questions
and Already Solved Solutions 2026
Updated.
purpose of blood agar plate - Answer differentiate bacteria based on hemolytic characteristics
Clearing around the growth is a result of complete lysis
gram (+) cocci produce exotoxins called? - Answer hemolysins
Exotoxins - Answer toxic substances that bacteria secrete into their environment
what exotoxins do streptococci produce and what do they do? - Answer streptolysins --
damage RBC
gamma - Answer no hemolysis
alpha - Answer medium hemolysis green appearance
beta - Answer complete hemolysis; medium realm appearance
what factors affect colonial morphology? - Answer genetics, medium, temperature, age, pH,
environment
what characteristics does morphology include? - Answer shape, texture, elevation, margin,
color
Different bacterial colony shapes - Answer round, circular, irregular, punctiform, filamentous,
rhizoid
punctiform - Answer tiny, pinpoint
filamentous colony - Answer long strands of bacteria growing end to end, resembling hair
strands
-thin individual projections
rhizoid colony - Answer thin, branching projections
, types of margins - Answer smooth, lobate, undulate, filamentous
lobate margin - Answer marked indentations
undulate margin - Answer wavy
filamentous margin - Answer threadlike, spreading edge
types of elevations - Answer flat, raised, convex, umbonate, crateriform
umbonate elevation - Answer raised in the center
crateriform - Answer cup-shaped
convex elevation - Answer dome-shaped elevation
why is pressure used in autoclaves? - Answer because higher pressures cause water to boil
above 100 degrees Celsius, which is necessary for killing harmful pathogens
what are plated media used for? - Answer obtaining isolation of species, differential testing,
and quantifying bacterial densities
what is aseptic technique? - Answer A procedure performed under sterile conditions, going
from pure culture to pure medium
why is it important to dilute a sample prior to inoculation? - Answer in order to spread out the
cells for movement and growth
streak plate method of isolation - Answer make it possible to isolate individual species of
bacteria from a mixed culture
what is streak plating used for? - Answer evaluating purity of culture, catalog the diversity of
species within a sample, to separate species from a mixed or contaminated sample, and to
document the growth pattern of microbe colonies
and Already Solved Solutions 2026
Updated.
purpose of blood agar plate - Answer differentiate bacteria based on hemolytic characteristics
Clearing around the growth is a result of complete lysis
gram (+) cocci produce exotoxins called? - Answer hemolysins
Exotoxins - Answer toxic substances that bacteria secrete into their environment
what exotoxins do streptococci produce and what do they do? - Answer streptolysins --
damage RBC
gamma - Answer no hemolysis
alpha - Answer medium hemolysis green appearance
beta - Answer complete hemolysis; medium realm appearance
what factors affect colonial morphology? - Answer genetics, medium, temperature, age, pH,
environment
what characteristics does morphology include? - Answer shape, texture, elevation, margin,
color
Different bacterial colony shapes - Answer round, circular, irregular, punctiform, filamentous,
rhizoid
punctiform - Answer tiny, pinpoint
filamentous colony - Answer long strands of bacteria growing end to end, resembling hair
strands
-thin individual projections
rhizoid colony - Answer thin, branching projections
, types of margins - Answer smooth, lobate, undulate, filamentous
lobate margin - Answer marked indentations
undulate margin - Answer wavy
filamentous margin - Answer threadlike, spreading edge
types of elevations - Answer flat, raised, convex, umbonate, crateriform
umbonate elevation - Answer raised in the center
crateriform - Answer cup-shaped
convex elevation - Answer dome-shaped elevation
why is pressure used in autoclaves? - Answer because higher pressures cause water to boil
above 100 degrees Celsius, which is necessary for killing harmful pathogens
what are plated media used for? - Answer obtaining isolation of species, differential testing,
and quantifying bacterial densities
what is aseptic technique? - Answer A procedure performed under sterile conditions, going
from pure culture to pure medium
why is it important to dilute a sample prior to inoculation? - Answer in order to spread out the
cells for movement and growth
streak plate method of isolation - Answer make it possible to isolate individual species of
bacteria from a mixed culture
what is streak plating used for? - Answer evaluating purity of culture, catalog the diversity of
species within a sample, to separate species from a mixed or contaminated sample, and to
document the growth pattern of microbe colonies
