Straighterline Microbiology Unit 1-25 Questions GUARANTEE
A+ 2025/2026
A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on
_______.
Select one:
a. determining if that species is the cause of a new disease
b. determining evolutionary relatedness
c. nomenclature
d. recombinant DNA
e. bioremediation - Determining evolutionary relatedness
Which of the following historical microbiologists is incorrectly paired with his contribution to the
science?
Select one:
a. Francesco Redi: tested spontaneous generation with meat exposed to the air or covered with cloth
b. Louis Pasteur: demonstrated that anthrax was caused by a bacterium
c. Joseph Lister: promoted disinfecting hands and air prior to surgery
d. Antonie van Leeuwenhoek:made and used quality magnifying lenses to observe and record
microorganisms - Louis pasteur: Demonstrated the anthrax was caused by a bacterium
Which of the following is a taxon that contains all the other taxa listed?
Select one:
a. Phylum
b. Genus
c. Kingdom
d. Family
e. Species - Kingdom
,Which of the following are not considered microorganisms?
Select one:
a. Mosquitoes
b. Fungi
c. Bacteria
d. Viruses
e. Protozoa - Mosquitoes
The microorganisms that recycle nutrients by breaking down dead matter and wastes are called ______.
Select one:
a. prokaryotes
b. decomposers
c. pathogens
d. fermenters
e. eukaryotes - b. Decomposers
Which of the following is a unique characteristic of viruses that distinguishes them from the other major
groups of microorganisms?
Select one:
a. Cannot be seen without a microscope
b. Cause human disease
c. Lack a nucleus
d. Lack cell structure
e. Contain genetic material - Lack of Cell structure
,All cells contain _______.
Select one:
a. mitochondria to generate ATP
b. organelles for compartmentalization
c. ribosomes for protein synthesis
d. cell walls made of cellulose
e. uracil in their DNA - c. ribosomes for protein synthesis
Compared to a solution of pH 9, a solution of pH 7 _______.
Select one:
a. has a higher pH
b. has no OH - ions
c. is more basic
d. has more H + ions - d. has more H + ions
Burning coal produces sulfur dioxide in the atmosphere. When combined with rain that falls into bodies
of water, this leads to _______.
Select one:
a. a greater concentration of OH- ions in the water
b. a decrease in the pH level of the water
c. no change in the pH level of the water
d. an increase in pH level of the water - b. a decrease in the pH level of the water
Most biochemical macromolecules are polymers, which are chains of ______.
Select one:
a. hydrogen bonds
, b. repeating carbohydrates
c. hydrophobic molecules
d. repeating monomers
e. electrolytic molecules - d. repeating monomers
Which type of microscope cannot image live specimens?
Select one:
a. Bright-field
b. Phase-contrast
c. Differential interference
d. Electron
e. Dark-field - d. Electron
A scanningconfocalmicroscope _______.
Select one:
a. uses ultraviolet light to form a specimen image
b. uses dyes that emit visible light when excited by ultraviolet radiation
c. scans narrow planes and can build a three-dimensional image of the specimen
d. produces specimen images on electron micrographs - c. scans narrow planes and can build a three-
dimensional image of the specimen
The term that refers to the purposeful addition of microorganisms into a laboratory nutrient medium is
______.
Select one:
a. inoculation
b. immunization
A+ 2025/2026
A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on
_______.
Select one:
a. determining if that species is the cause of a new disease
b. determining evolutionary relatedness
c. nomenclature
d. recombinant DNA
e. bioremediation - Determining evolutionary relatedness
Which of the following historical microbiologists is incorrectly paired with his contribution to the
science?
Select one:
a. Francesco Redi: tested spontaneous generation with meat exposed to the air or covered with cloth
b. Louis Pasteur: demonstrated that anthrax was caused by a bacterium
c. Joseph Lister: promoted disinfecting hands and air prior to surgery
d. Antonie van Leeuwenhoek:made and used quality magnifying lenses to observe and record
microorganisms - Louis pasteur: Demonstrated the anthrax was caused by a bacterium
Which of the following is a taxon that contains all the other taxa listed?
Select one:
a. Phylum
b. Genus
c. Kingdom
d. Family
e. Species - Kingdom
,Which of the following are not considered microorganisms?
Select one:
a. Mosquitoes
b. Fungi
c. Bacteria
d. Viruses
e. Protozoa - Mosquitoes
The microorganisms that recycle nutrients by breaking down dead matter and wastes are called ______.
Select one:
a. prokaryotes
b. decomposers
c. pathogens
d. fermenters
e. eukaryotes - b. Decomposers
Which of the following is a unique characteristic of viruses that distinguishes them from the other major
groups of microorganisms?
Select one:
a. Cannot be seen without a microscope
b. Cause human disease
c. Lack a nucleus
d. Lack cell structure
e. Contain genetic material - Lack of Cell structure
,All cells contain _______.
Select one:
a. mitochondria to generate ATP
b. organelles for compartmentalization
c. ribosomes for protein synthesis
d. cell walls made of cellulose
e. uracil in their DNA - c. ribosomes for protein synthesis
Compared to a solution of pH 9, a solution of pH 7 _______.
Select one:
a. has a higher pH
b. has no OH - ions
c. is more basic
d. has more H + ions - d. has more H + ions
Burning coal produces sulfur dioxide in the atmosphere. When combined with rain that falls into bodies
of water, this leads to _______.
Select one:
a. a greater concentration of OH- ions in the water
b. a decrease in the pH level of the water
c. no change in the pH level of the water
d. an increase in pH level of the water - b. a decrease in the pH level of the water
Most biochemical macromolecules are polymers, which are chains of ______.
Select one:
a. hydrogen bonds
, b. repeating carbohydrates
c. hydrophobic molecules
d. repeating monomers
e. electrolytic molecules - d. repeating monomers
Which type of microscope cannot image live specimens?
Select one:
a. Bright-field
b. Phase-contrast
c. Differential interference
d. Electron
e. Dark-field - d. Electron
A scanningconfocalmicroscope _______.
Select one:
a. uses ultraviolet light to form a specimen image
b. uses dyes that emit visible light when excited by ultraviolet radiation
c. scans narrow planes and can build a three-dimensional image of the specimen
d. produces specimen images on electron micrographs - c. scans narrow planes and can build a three-
dimensional image of the specimen
The term that refers to the purposeful addition of microorganisms into a laboratory nutrient medium is
______.
Select one:
a. inoculation
b. immunization
