MCB 2004L: Microbiology for the Health
Services Laboratory Practice Latest
2026-2027 Questions and Answers
Which of the following pairs of terms is mismatched? -
Correct Answers ✅bacteriostatic - kills vegetative bacterial
cells
The preservation of beef jerky from microbial growth relies on
which method of microbial control? - Correct Answers
✅desiccation
Which of the following is the most difficult to inactivate? -
Correct Answers ✅bacterial endospores
Which of the following is the best method to sterilize heat-
labile solutions? - Correct Answers ✅membrane filtration
A bacterial genome is typically - Correct Answers ✅a single
circular DNA molecule
An enzyme produced in response to the presence of a
substrate is called a(n)
Hint: think operon regulation - Correct Answers ✅inducible
enzyme
Which of the following is involved in translation? - Correct
Answers ✅mRNA, rRNA, and tRNA are all involved
,MCB 2004L: Microbiology for the Health
Services Laboratory Practice Latest
2026-2027 Questions and Answers
According to the operon model, for the synthesis of an
inducible enzyme to occur, the - Correct Answers
✅substrate must bind to the repressor
In figure 8.1, which colony(ies) is/are streptomycin-resistant
and valine-requiring? - Correct Answers ✅5
Which of the following causes mutations by creating thymine
dimers? - Correct Answers ✅ultraviolet light
Which method of inserting DNA into cells is illustrated in
figure 8.1? - Correct Answers ✅protoplast fusion
Which of the following is NOT a desired characteristic of DNA
vectors used in gene cloning procedures? - Correct Answers
✅large size
Biotechnology involves the - Correct Answers ✅use of
microorganisms to make desired products, the use of animal
cells to make vaccines, and the development of disease-
resistant crop plants.
The natural role of restriction enzymes in bacteria is to -
Correct Answers ✅protect the cell from invading phages
,MCB 2004L: Microbiology for the Health
Services Laboratory Practice Latest
2026-2027 Questions and Answers
Which of the following restriction enzyme sites would produce
blunt-ended fragments? (the arrow represents the cutting of
the enzyme) - Correct Answers ✅CCC↓GGG
The phylogenetic classification of bacteria is based on
_________ studies - Correct Answers ✅rRNA, ribosomal RNA
sequences
Which of the following is the best evidence for a three-
domain system? - Correct Answers ✅nucleotide sequences
in ribosomal RNA vary between all three domains
A biochemical test, in the microbiology world, is used to
determine - Correct Answers ✅capability of a microbe to
perform specific enzymatic activity
What is the outstanding characteristic of the Kingdom Fungi?
- Correct Answers ✅members absorb dissolved organic
matter (chemo- or photo- heterotrophs)
In table 10.1, which features are found in nearly all eukarya? -
Correct Answers ✅2, 3, 5
, MCB 2004L: Microbiology for the Health
Services Laboratory Practice Latest
2026-2027 Questions and Answers
Assume 10^9 E. coli cells/ml are in a flask. Which graph in
Figure 7.2 best depicts the effect of placing the culture at 7°C
at time x? - Correct Answers ✅d
Seventy percent alcohol is effective against - Correct
Answers ✅enveloped viruses
A chemical agent that dissolves lipids can damage - Correct
Answers ✅cells and enveloped viruses
The following data were obtained by incubating gram-positive
bacteria in nutrient medium + disinfectant for 24 hours, then
transferring one loopful to nutrient medium (subculturing). (+
= growth; - = no growth) In Table 7.3, which disinfectant was
bactericidal? - Correct Answers ✅mortum
In Figure 8.5, which model of the lac operon correctly shows
RNA polymerase, lactose, and repressor protein when the
structural genes are being transcribed? - Correct Answers
✅d
Two bacterial strains have the same genes for metabolizing a
carbohydrate, but one is wild-type for a regulatory inducer
while the other does not produce the inducer. Which of the
following statements is CORRECT with regard to the
Services Laboratory Practice Latest
2026-2027 Questions and Answers
Which of the following pairs of terms is mismatched? -
Correct Answers ✅bacteriostatic - kills vegetative bacterial
cells
The preservation of beef jerky from microbial growth relies on
which method of microbial control? - Correct Answers
✅desiccation
Which of the following is the most difficult to inactivate? -
Correct Answers ✅bacterial endospores
Which of the following is the best method to sterilize heat-
labile solutions? - Correct Answers ✅membrane filtration
A bacterial genome is typically - Correct Answers ✅a single
circular DNA molecule
An enzyme produced in response to the presence of a
substrate is called a(n)
Hint: think operon regulation - Correct Answers ✅inducible
enzyme
Which of the following is involved in translation? - Correct
Answers ✅mRNA, rRNA, and tRNA are all involved
,MCB 2004L: Microbiology for the Health
Services Laboratory Practice Latest
2026-2027 Questions and Answers
According to the operon model, for the synthesis of an
inducible enzyme to occur, the - Correct Answers
✅substrate must bind to the repressor
In figure 8.1, which colony(ies) is/are streptomycin-resistant
and valine-requiring? - Correct Answers ✅5
Which of the following causes mutations by creating thymine
dimers? - Correct Answers ✅ultraviolet light
Which method of inserting DNA into cells is illustrated in
figure 8.1? - Correct Answers ✅protoplast fusion
Which of the following is NOT a desired characteristic of DNA
vectors used in gene cloning procedures? - Correct Answers
✅large size
Biotechnology involves the - Correct Answers ✅use of
microorganisms to make desired products, the use of animal
cells to make vaccines, and the development of disease-
resistant crop plants.
The natural role of restriction enzymes in bacteria is to -
Correct Answers ✅protect the cell from invading phages
,MCB 2004L: Microbiology for the Health
Services Laboratory Practice Latest
2026-2027 Questions and Answers
Which of the following restriction enzyme sites would produce
blunt-ended fragments? (the arrow represents the cutting of
the enzyme) - Correct Answers ✅CCC↓GGG
The phylogenetic classification of bacteria is based on
_________ studies - Correct Answers ✅rRNA, ribosomal RNA
sequences
Which of the following is the best evidence for a three-
domain system? - Correct Answers ✅nucleotide sequences
in ribosomal RNA vary between all three domains
A biochemical test, in the microbiology world, is used to
determine - Correct Answers ✅capability of a microbe to
perform specific enzymatic activity
What is the outstanding characteristic of the Kingdom Fungi?
- Correct Answers ✅members absorb dissolved organic
matter (chemo- or photo- heterotrophs)
In table 10.1, which features are found in nearly all eukarya? -
Correct Answers ✅2, 3, 5
, MCB 2004L: Microbiology for the Health
Services Laboratory Practice Latest
2026-2027 Questions and Answers
Assume 10^9 E. coli cells/ml are in a flask. Which graph in
Figure 7.2 best depicts the effect of placing the culture at 7°C
at time x? - Correct Answers ✅d
Seventy percent alcohol is effective against - Correct
Answers ✅enveloped viruses
A chemical agent that dissolves lipids can damage - Correct
Answers ✅cells and enveloped viruses
The following data were obtained by incubating gram-positive
bacteria in nutrient medium + disinfectant for 24 hours, then
transferring one loopful to nutrient medium (subculturing). (+
= growth; - = no growth) In Table 7.3, which disinfectant was
bactericidal? - Correct Answers ✅mortum
In Figure 8.5, which model of the lac operon correctly shows
RNA polymerase, lactose, and repressor protein when the
structural genes are being transcribed? - Correct Answers
✅d
Two bacterial strains have the same genes for metabolizing a
carbohydrate, but one is wild-type for a regulatory inducer
while the other does not produce the inducer. Which of the
following statements is CORRECT with regard to the
