MCB3023 Final Exam Questions with
Complete Solutions 2026 Updated.
major component of the cell wall of microbes in the Bacteria domain - Answer peptidoglycan
Truths about early Earth's atmosphere: - Answer -H2 gas was present
-reducing atmosphere
-Oxygen present in small amounts
-N2 present in very large amounts
short fiber-like structures that protrude from the bacterial surface and are primarily used for
attachment are called - Answer pili
study of microbiology includes: - Answer -fungi
-algae
-bacteria
-viruses
NOT PLANTS
what is required during aerobic respiration - Answer oxygen
approximately when did primitive cells first appear on earth? - Answer 3.8 billion years ago
which region contains the chromosome of the bacterial cell? - Answer Nucleoid
what is the main function of the FtsZ protein in the bacterial cell? - Answer cell division
beta-lactamase enzymes do what? - Answer inactivate antibiotics like penicillin
during nitrogen fixation, microorganisms convert - Answer ammonia (NH3) to nitrate (NO3-)
which molecular tool most assisted in providing a more reliable way to verify the assertions
made by Woese et al in their 1990 paper on phylogeny? - Answer PCR (Polymerase Chain
Reaction)
, Select the structure and associated function which is incorrect:
S-layer, protection
Flagella, motility
Capsule, protection
Peptidoglycan, protection
TonB, diffusion - Answer TonB, Diffusion
All known hyperthermophiles possess this enzyme to increase the supercoiling of the DNA and
help stabilize it at high temperatures. - Answer reverse DNA gyrase
in which of these are archaea and bacteria significantly different?
-possessesion of membrane enclosed organelles
-membrane lipid structure
-chromosome size and organization
-cell size
-lack of a membrane-enclosed nucleus - Answer membrane lipid structure (fatty acid with
ester linkages vs Isoprenoids with ether linkages)
which combination of bacterial species was most beneficial for weight gain in gnotobiotic mice?
- Answer bacteroides, methanobrevibacter
what are the two lines of evidence that support the Endosymbiotic Theory for the origin of
chloroplasts? - Answer they divide by binary fission and they contain DNA
chloroplasts most likely originated from - Answer cyanobacteria
plaque forming units counts: - Answer infective viruses only
an instrument designed to use moist heat for sterilization is the - Answer autoclave
which substance inhibits the growth of gram positive bacteria? - Answer bile salts
Complete Solutions 2026 Updated.
major component of the cell wall of microbes in the Bacteria domain - Answer peptidoglycan
Truths about early Earth's atmosphere: - Answer -H2 gas was present
-reducing atmosphere
-Oxygen present in small amounts
-N2 present in very large amounts
short fiber-like structures that protrude from the bacterial surface and are primarily used for
attachment are called - Answer pili
study of microbiology includes: - Answer -fungi
-algae
-bacteria
-viruses
NOT PLANTS
what is required during aerobic respiration - Answer oxygen
approximately when did primitive cells first appear on earth? - Answer 3.8 billion years ago
which region contains the chromosome of the bacterial cell? - Answer Nucleoid
what is the main function of the FtsZ protein in the bacterial cell? - Answer cell division
beta-lactamase enzymes do what? - Answer inactivate antibiotics like penicillin
during nitrogen fixation, microorganisms convert - Answer ammonia (NH3) to nitrate (NO3-)
which molecular tool most assisted in providing a more reliable way to verify the assertions
made by Woese et al in their 1990 paper on phylogeny? - Answer PCR (Polymerase Chain
Reaction)
, Select the structure and associated function which is incorrect:
S-layer, protection
Flagella, motility
Capsule, protection
Peptidoglycan, protection
TonB, diffusion - Answer TonB, Diffusion
All known hyperthermophiles possess this enzyme to increase the supercoiling of the DNA and
help stabilize it at high temperatures. - Answer reverse DNA gyrase
in which of these are archaea and bacteria significantly different?
-possessesion of membrane enclosed organelles
-membrane lipid structure
-chromosome size and organization
-cell size
-lack of a membrane-enclosed nucleus - Answer membrane lipid structure (fatty acid with
ester linkages vs Isoprenoids with ether linkages)
which combination of bacterial species was most beneficial for weight gain in gnotobiotic mice?
- Answer bacteroides, methanobrevibacter
what are the two lines of evidence that support the Endosymbiotic Theory for the origin of
chloroplasts? - Answer they divide by binary fission and they contain DNA
chloroplasts most likely originated from - Answer cyanobacteria
plaque forming units counts: - Answer infective viruses only
an instrument designed to use moist heat for sterilization is the - Answer autoclave
which substance inhibits the growth of gram positive bacteria? - Answer bile salts
