MBIO 3401 Exam 1 Zhang Actual Exam (Latest 2025
/ 2026 Update) Real Questions and Verified
Answers | 100% Correct | Already Graded A+.
which of the following scientist-contribution pairs is not matched
correctly? ✔✔CORRECT ANSWERS✔✔louis pasteur proved
spontaneous generation
what is robert kochs contribution ✔✔CORRECT
ANSWERS✔✔developed the criteria for establishing a causative link
betwen an infectious agent and disease
what is leewunhoek's contribution ✔✔CORRECT
ANSWERS✔✔discovered individual microbes
what is nightingales contributions ✔✔CORRECT ANSWERS✔✔founded
medical statistics
kochs postulates include all of the following except what ✔✔CORRECT
ANSWERS✔✔the pathogen must be shown to contain toxins
kocks postulates ✔✔CORRECT ANSWERS✔✔a pure culture must be
obtained, pathogne must be found in every individual suffering from
,the disease, the isolated pathogen must be used to infect healthy hosts,
healthy individuals infected with osilated suspected pathogen must get
sick with disease
who performed the first vaccination ✔✔CORRECT
ANSWERS✔✔edward jenner
who discovered the first antibiotic ✔✔CORRECT
ANSWERS✔✔alexander fleming
who are the ancestors of mitochondria ✔✔CORRECT
ANSWERS✔✔proteobacteria
what size are normal microbes ✔✔CORRECT ANSWERS✔✔10-100um
what type of microbes are less than 10um ✔✔CORRECT
ANSWERS✔✔prokaryotes
what is the correct order of reagents in gram stain ✔✔CORRECT
ANSWERS✔✔crystal violet, idodine, ehtanol, safranin
in fluorescence micorscopy, the specimen absorbs incident light and
then re-emits a _____ energy and a _____ wavelength ✔✔CORRECT
ANSWERS✔✔lower, longer
,which of the following microscopes allows the best view of bacterial
flagella during motility ✔✔CORRECT ANSWERS✔✔dark-field
microscope
what type pf microscopy exploits differnces in refactive indices between
cell parts and surroundign media as well as all live cells ✔✔CORRECT
ANSWERS✔✔phase-contrst microscopy
scanning electron microscopy ✔✔CORRECT ANSWERS✔✔specimen is
fixed and embedded, it cannot be used to view live specimen, provdes
3D image of the specimen
atomic force microscope ✔✔CORRECT ANSWERS✔✔measures van der
Waals forces, example of scanning probe microscop e
what is the best method to examining the presensce of a chemical
structure with a diameter of 3nm? ✔✔CORRECT ANSWERS✔✔x-ray
crystallography
what is the structure of prokaryotes that performs the same function as
mitochodria in eukaryotes ✔✔CORRECT ANSWERS✔✔cell membrane
lipids ✔✔CORRECT ANSWERS✔✔have ester linkages, while those of
archaea have ether linkages
, component of peptidoglycan ✔✔CORRECT ANSWERS✔✔n-
acetylmuramic acid, n-acetylglucosamine, amino acids, peptide cross-
links
prokaryotic outer membrane ✔✔CORRECT ANSWERS✔✔found in gram
negative bacteria, contains porins, contains toxic component, contains
lipopolysaccharide layer
prokaryotic chromosome ✔✔CORRECT ANSWERS✔✔has a single origin
of replication and then DNA is replicated bidirectionally
what does a stalked cell in caulobacter crescentus divide to reproduce
✔✔CORRECT ANSWERS✔✔a stalked cell and a flagellated cell
what is an extension of the cytoplasm that attaches bacteria to a
surface called ✔✔CORRECT ANSWERS✔✔stalk
prokaryotic flagella ✔✔CORRECT ANSWERS✔✔driven by proton motice
force, found in both gram - and gram +, embedded in the cell envelope,
used for chemotaxis
limitations for koch's postulates ✔✔CORRECT ANSWERS✔✔not all
microbes can be grown in pure culture, sometimes the causing agent
/ 2026 Update) Real Questions and Verified
Answers | 100% Correct | Already Graded A+.
which of the following scientist-contribution pairs is not matched
correctly? ✔✔CORRECT ANSWERS✔✔louis pasteur proved
spontaneous generation
what is robert kochs contribution ✔✔CORRECT
ANSWERS✔✔developed the criteria for establishing a causative link
betwen an infectious agent and disease
what is leewunhoek's contribution ✔✔CORRECT
ANSWERS✔✔discovered individual microbes
what is nightingales contributions ✔✔CORRECT ANSWERS✔✔founded
medical statistics
kochs postulates include all of the following except what ✔✔CORRECT
ANSWERS✔✔the pathogen must be shown to contain toxins
kocks postulates ✔✔CORRECT ANSWERS✔✔a pure culture must be
obtained, pathogne must be found in every individual suffering from
,the disease, the isolated pathogen must be used to infect healthy hosts,
healthy individuals infected with osilated suspected pathogen must get
sick with disease
who performed the first vaccination ✔✔CORRECT
ANSWERS✔✔edward jenner
who discovered the first antibiotic ✔✔CORRECT
ANSWERS✔✔alexander fleming
who are the ancestors of mitochondria ✔✔CORRECT
ANSWERS✔✔proteobacteria
what size are normal microbes ✔✔CORRECT ANSWERS✔✔10-100um
what type of microbes are less than 10um ✔✔CORRECT
ANSWERS✔✔prokaryotes
what is the correct order of reagents in gram stain ✔✔CORRECT
ANSWERS✔✔crystal violet, idodine, ehtanol, safranin
in fluorescence micorscopy, the specimen absorbs incident light and
then re-emits a _____ energy and a _____ wavelength ✔✔CORRECT
ANSWERS✔✔lower, longer
,which of the following microscopes allows the best view of bacterial
flagella during motility ✔✔CORRECT ANSWERS✔✔dark-field
microscope
what type pf microscopy exploits differnces in refactive indices between
cell parts and surroundign media as well as all live cells ✔✔CORRECT
ANSWERS✔✔phase-contrst microscopy
scanning electron microscopy ✔✔CORRECT ANSWERS✔✔specimen is
fixed and embedded, it cannot be used to view live specimen, provdes
3D image of the specimen
atomic force microscope ✔✔CORRECT ANSWERS✔✔measures van der
Waals forces, example of scanning probe microscop e
what is the best method to examining the presensce of a chemical
structure with a diameter of 3nm? ✔✔CORRECT ANSWERS✔✔x-ray
crystallography
what is the structure of prokaryotes that performs the same function as
mitochodria in eukaryotes ✔✔CORRECT ANSWERS✔✔cell membrane
lipids ✔✔CORRECT ANSWERS✔✔have ester linkages, while those of
archaea have ether linkages
, component of peptidoglycan ✔✔CORRECT ANSWERS✔✔n-
acetylmuramic acid, n-acetylglucosamine, amino acids, peptide cross-
links
prokaryotic outer membrane ✔✔CORRECT ANSWERS✔✔found in gram
negative bacteria, contains porins, contains toxic component, contains
lipopolysaccharide layer
prokaryotic chromosome ✔✔CORRECT ANSWERS✔✔has a single origin
of replication and then DNA is replicated bidirectionally
what does a stalked cell in caulobacter crescentus divide to reproduce
✔✔CORRECT ANSWERS✔✔a stalked cell and a flagellated cell
what is an extension of the cytoplasm that attaches bacteria to a
surface called ✔✔CORRECT ANSWERS✔✔stalk
prokaryotic flagella ✔✔CORRECT ANSWERS✔✔driven by proton motice
force, found in both gram - and gram +, embedded in the cell envelope,
used for chemotaxis
limitations for koch's postulates ✔✔CORRECT ANSWERS✔✔not all
microbes can be grown in pure culture, sometimes the causing agent
