MICROBIOLOGY 211 TEST 1 QUESTIONS WITH COMPLETE SOLUTIONS 100% VERIFIED| LATEST
UPDATE GRADED A+
Scanning Electron Microscopes (SEM) -to view the outside of specimen
-electron gun produces beam of electrons
-pass through magnetic lenses
Electron Microscopes: benefits and drawbacks benefits=
-magnify up to 100,00x
-resolving power 0.2 nm
drawbacks=
-costly
-large/bulky size
-time consuming
-specimen killed and preserved in toxic chemicals
-only used to document
cell walls -found in prokaryotes and eukaryotes
-outer most layer of microbial cells
functions of cell walls -provides shape/structure
-protects form osmotic forces
-aids in attachment in other cells/surfaces
microorganisms that are prokaryotes -bacteria
,-archaea
microorganisms that are eukaryotes -fungi
-algae
-protozoa
glycocalyx found in:
-bacteria
-eukaryotes that lack cell walls
composed of:
-polysaccharide
-protein
-combination of the two
functions of glycocalyx bacteria:
-attachment
-prevents dehydration
-cell to cell recognition/communication
-backup food supply
-prevent immune system recognition
eukaryotes:
-strengthens cell surfacs
flagella found in:
, -prokaryotes
-eukaryotes
functions of flagella -motility
direction of movement between bacteria, archaea, and eukaryotes bacteria and archaea:
-360 rotation
eukaryotes:
-back/forth motion
power source for movement between bacteria, archaea, and eukaryotes bacteria:
-Na/H ions
archaea and eukaryotes:
-ATP hydrolysis
common microorganisms -bacteria
-fungi
-protozoa
-viruses
-parasitic worms
-algae
peritrichous multiple flagella on all sides
UPDATE GRADED A+
Scanning Electron Microscopes (SEM) -to view the outside of specimen
-electron gun produces beam of electrons
-pass through magnetic lenses
Electron Microscopes: benefits and drawbacks benefits=
-magnify up to 100,00x
-resolving power 0.2 nm
drawbacks=
-costly
-large/bulky size
-time consuming
-specimen killed and preserved in toxic chemicals
-only used to document
cell walls -found in prokaryotes and eukaryotes
-outer most layer of microbial cells
functions of cell walls -provides shape/structure
-protects form osmotic forces
-aids in attachment in other cells/surfaces
microorganisms that are prokaryotes -bacteria
,-archaea
microorganisms that are eukaryotes -fungi
-algae
-protozoa
glycocalyx found in:
-bacteria
-eukaryotes that lack cell walls
composed of:
-polysaccharide
-protein
-combination of the two
functions of glycocalyx bacteria:
-attachment
-prevents dehydration
-cell to cell recognition/communication
-backup food supply
-prevent immune system recognition
eukaryotes:
-strengthens cell surfacs
flagella found in:
, -prokaryotes
-eukaryotes
functions of flagella -motility
direction of movement between bacteria, archaea, and eukaryotes bacteria and archaea:
-360 rotation
eukaryotes:
-back/forth motion
power source for movement between bacteria, archaea, and eukaryotes bacteria:
-Na/H ions
archaea and eukaryotes:
-ATP hydrolysis
common microorganisms -bacteria
-fungi
-protozoa
-viruses
-parasitic worms
-algae
peritrichous multiple flagella on all sides
