MCB 100 - Exam 1 Practice Questions and 100% Correct Answers
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Course
MCB 100
Institution
MCB 100
Microbiology includes the study of which 6 life forms bacteria Archaea Viruses Protozoa Lower fungi (yeasts, molds) Algae
______ used to be the determining factor over whether or not something was a microorganism...now the determining factor is________ size, whether or not something forms differen...
MCB 100 - Exam 1 Practice Questions
and 100% Correct Answers
Microbiology includes the study of which 6 life forms ✅bacteria
Archaea
Viruses
Protozoa
Lower fungi (yeasts, molds)
Algae
______ used to be the determining factor over whether or not something was a
microorganism...now the determining factor is________ ✅size, whether or not
something forms differentiated tissues
Most microorganisms are composed of just one ______ ✅cell
Length of typical bacteria ✅1-2 microns
Length of typical mammalian cells ✅5-15 microns
Order these by size and give their measurement values:
-nanometer
-micron
-millimeter
-angstrom ✅milli - 10^-3 meters
Micron - 10^-6 meters
Nanometer - 10^-9 meters
Angstrom - 10^-10 meters
A sphere that is 10 microns in diameter has ______ times the volume of a sphere that is
1 micron in diameter ✅1,000 times
6 main traits of all living cells (KNOW THESE) ✅-able to grow and reproduce
-genetic material is DNA
-metabolism
-able to make or acquire ATP
-able to synthesize proteins
-bound by an active cell membrane
, Viruses differ from bacteria in that they are not _____________ ✅cellular organisms
The DNA or RNA of a virus is surrounded by a ______, also known as the capsid ✅a
coat of protein
Some (but not all) viruses have a _____ ______ on the very outside ✅lipid envelope
Viruses lack ____ & ____, so they can not synthesize proteins on their own
✅ribosomes & trna
Why do viruses lack metabolic abilities ✅viruses have few or no enzymes
Viruses have no way of generating _____ for biochemical activities ✅ATP
Define obligate intracellular parasite and give an example ✅something that must be
inside a living host cell in order to have life-like functions, such as reproduction.
Example is a virus
Bacteria are generally _____ in size than viruses ✅larger
Which three types of microorganisms lack a cell wall ✅animals, protozoa, mycoplasma
(genus of bacteria that lacks cell wall)
Cell membrane vs cell wall ✅membrane: lipid layer that acts as a diffusion barrier
Wall: polysaccharide layer that maintains shape, but is not a diffusion barrier
Name the prokaryotes ✅bacteria & archea
Name the eukaryotes ✅protozoa, fungi, algae
Which microorganisms have 70S ✅prokaryotes - bacteria & archea
____ have a cell wall composed of chitin ✅fungi
Stromatolites are an example of ________ ✅photosynthetic bacteria (cyanobacteria)
4 questions that drove the development of Microbiology ✅1. Can living organisms
arise by spontaneous generation?
2. What causes fermentation?
3. What causes disease?
4. How can we prevent and treat infectious diseases?
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