BIOL 2030 EVALUATION EXAM 2026 QUESTIONS AND
ANSWERS RATED A+
✔✔Normal microbiota are responsible for all of the following except - ✔✔controlling
epigenetic expression.
✔✔Which of the following does not contribute to shifts in our normal microbiota? -
✔✔proper hand-washing technique
✔✔All of the following are or can be produced by microbes except - ✔✔electronics like
computer memory.
✔✔________ bacteria can create sticky communities called ________, which are made
up of single or diverse microbial species. - ✔✔Planktonic; biofilms
✔✔Why is the unknown in this example not Pseudomonas? - ✔✔It ferments lactose.
✔✔What test result indicates that the unknown can utilize citrate as its sole carbon
source? - ✔✔The medium turns blue.
✔✔How would the results be different if this organism was Salmonella? - ✔✔It would
produce hydrogen sulfide.
✔✔How is fermentation of lactose detected? - ✔✔The drop in pH turns the indicator dye
yellow.
✔✔How many questions are needed in this dichotomous key to determine if the
unknown is Bacteroides? - ✔✔3
✔✔How many answers are there to a question in a dichotomous key flowchart? - ✔✔2
✔✔Why are flowcharts useful for dichotomous keys? - ✔✔They allow the researcher to
visualize relationships between different bacteria.
✔✔The first question in this dichotomous key addresses - ✔✔Gram stain differences.
✔✔Choose the false statement about aseptic culturing techniques. - ✔✔Aseptic
technique is unnecessary in most labs because the majority of microbes are not
pathogenic.
✔✔_________ is used to isolate individual colonies on a solidified agar surface. -
✔✔The streak plate method
, ✔✔Which of the following is (are) mismatched? To be marked correct, you'll need to
select all mismatched statements, as there may be more than one correct answer. -
✔✔Gram stain: turns Gram-negative cells purple
Acid-fast stain: turns acid-fast cells blue
✔✔Immersion oil is required to _________. - ✔✔minimize scattered light when the high-
powered lens is used
✔✔_________ is the ability to distinguish two distinct points as separate. -
✔✔Resolution
✔✔Which of the following types of microscopy would be the best to provide information
about 3-dimensional surface structures of a virus? - ✔✔Scanning electron microscopy
✔✔The goal of the streak plate technique is to - ✔✔isolate a pure culture for study from
a single colony.
✔✔Which of the following statements about bright field microscopy are true? - ✔✔Bright
field microscopy is the simplest and most common form of microscopy.
✔✔Why do electron microscopes have a better resolution versus light microscopes? -
✔✔An electron beam has a wavelength of about 1 nm, and resolution improves with
smaller wavelengths.
✔✔Which of the following is not a microorganism? - ✔✔mosquito
✔✔When do opportunistic pathogens tend to cause disease? - ✔✔when the host is
weakened
✔✔Choose the true statement(s) about atoms. To be marked correct, you'll need to
select all true statements, as there may be more than one correct answer. - ✔✔The
nucleus of an atom contains neutrons.
An atom is the smallest unit of an element.
✔✔___________ are usually found in an atom's outermost shell and tend to participate
in chemical reactions. - ✔✔Valence electrons
✔✔Select the true statement(s) about ionic bonds. To be marked correct, you'll need to
select all true statements, as there may be more than one correct answer. - ✔✔An ionic
bond requires the transfer of electrons from one atom to another.
An ionic bond is an electrostatic force that exists between cations and anions.
ANSWERS RATED A+
✔✔Normal microbiota are responsible for all of the following except - ✔✔controlling
epigenetic expression.
✔✔Which of the following does not contribute to shifts in our normal microbiota? -
✔✔proper hand-washing technique
✔✔All of the following are or can be produced by microbes except - ✔✔electronics like
computer memory.
✔✔________ bacteria can create sticky communities called ________, which are made
up of single or diverse microbial species. - ✔✔Planktonic; biofilms
✔✔Why is the unknown in this example not Pseudomonas? - ✔✔It ferments lactose.
✔✔What test result indicates that the unknown can utilize citrate as its sole carbon
source? - ✔✔The medium turns blue.
✔✔How would the results be different if this organism was Salmonella? - ✔✔It would
produce hydrogen sulfide.
✔✔How is fermentation of lactose detected? - ✔✔The drop in pH turns the indicator dye
yellow.
✔✔How many questions are needed in this dichotomous key to determine if the
unknown is Bacteroides? - ✔✔3
✔✔How many answers are there to a question in a dichotomous key flowchart? - ✔✔2
✔✔Why are flowcharts useful for dichotomous keys? - ✔✔They allow the researcher to
visualize relationships between different bacteria.
✔✔The first question in this dichotomous key addresses - ✔✔Gram stain differences.
✔✔Choose the false statement about aseptic culturing techniques. - ✔✔Aseptic
technique is unnecessary in most labs because the majority of microbes are not
pathogenic.
✔✔_________ is used to isolate individual colonies on a solidified agar surface. -
✔✔The streak plate method
, ✔✔Which of the following is (are) mismatched? To be marked correct, you'll need to
select all mismatched statements, as there may be more than one correct answer. -
✔✔Gram stain: turns Gram-negative cells purple
Acid-fast stain: turns acid-fast cells blue
✔✔Immersion oil is required to _________. - ✔✔minimize scattered light when the high-
powered lens is used
✔✔_________ is the ability to distinguish two distinct points as separate. -
✔✔Resolution
✔✔Which of the following types of microscopy would be the best to provide information
about 3-dimensional surface structures of a virus? - ✔✔Scanning electron microscopy
✔✔The goal of the streak plate technique is to - ✔✔isolate a pure culture for study from
a single colony.
✔✔Which of the following statements about bright field microscopy are true? - ✔✔Bright
field microscopy is the simplest and most common form of microscopy.
✔✔Why do electron microscopes have a better resolution versus light microscopes? -
✔✔An electron beam has a wavelength of about 1 nm, and resolution improves with
smaller wavelengths.
✔✔Which of the following is not a microorganism? - ✔✔mosquito
✔✔When do opportunistic pathogens tend to cause disease? - ✔✔when the host is
weakened
✔✔Choose the true statement(s) about atoms. To be marked correct, you'll need to
select all true statements, as there may be more than one correct answer. - ✔✔The
nucleus of an atom contains neutrons.
An atom is the smallest unit of an element.
✔✔___________ are usually found in an atom's outermost shell and tend to participate
in chemical reactions. - ✔✔Valence electrons
✔✔Select the true statement(s) about ionic bonds. To be marked correct, you'll need to
select all true statements, as there may be more than one correct answer. - ✔✔An ionic
bond requires the transfer of electrons from one atom to another.
An ionic bond is an electrostatic force that exists between cations and anions.
