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BIOS 242 Week 3 Quiz: MCQs & Short Answer Latest Complete Solution Guide. $10.99   Add to cart

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BIOS 242 Week 3 Quiz: MCQs & Short Answer Latest Complete Solution Guide.

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BIOS 242 Week 3 Quiz: MCQs & Short Answer Latest Complete Solution Guide.

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  • August 23, 2024
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  • 2024/2025
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Saprobes (chemoheterotroph) organism that obtains food from decaying organic matter (dead organisms)

Parasites (chemoheterotroph) Gets nutrition from living organisms and cause harm to the host

Temperature
Gases
Microbial Growth is influenced by pH
Osmotic pressure
Hydrostatic pressure

osmotic pressure the external pressure that must be applied to stop osmosis

hydrostatic pressure atmospheric pressure

Psychophiles Cold loving microbes -optimum temp = 10C temp range = -10-20C

Psychrotolerant tolerate cold temperatures (adaptations in their cytoplasmic membranes)

Mesophiles moderate temperature loving (prevalent in the human body)

Thermophiles heat loving microbes

extreme thermophiles (archaea) love very hot environments 125 degrees optimally

requires oxygen to grow and cannot live without it

Obligate Aerobe



can live with or without oxygen

Faculative anaerobes



tolerate but cannot use oxygen

aerotolerant anaerobes



Organisms that cannot live where molecular
oxygen is present
obligate anaerobes



require oxygen concentration lower than air

Microaerophiles



Neutrophiles Grow in habitats that range between 6 and 8

salt loving
Halophiles
(osomotic pressure)

Barophiles organisms that live under REQUIRE high pressure (atmospheric pressure)

The first phase of the bacterial growth curve is
when organisms acclimate to their surrounding; they
lag phase of bacterial growth
grow in size but do not increase in number.



Rapid growth is when the size of a population
increases excessively.
exponential growth phase

, period of EQUILIBRIUM, microbial deaths
BALANCE PRODUCTION of new cells
stationary phase



microbes die off

death phase of bacterial growth



Metabolic pathways that BREAK DOWN molecules,
releasing energy.
Catabolism
YIELDS ENERGY



The phase of metabolism is when simple substances
are SYNTHESIZED into the complex materials of
Anabolisim
living tissue.
USES ENERGY

All of the chemical reactions that occur within an organism. THE SUM OF CATABOLIC
Metabolism
AND ANABOLIC REACTIONS TOGETHER

The reactants that bind to the enzyme

substrates



the region of an enzyme that attaches to a substrate
catalyzes the reaction
Active site of an enzyme



-For enzyme and substrate to react, surfaces of
each must be complementary
Specificity of the Enzyme-Substrate -Enzyme specificity: the ability of an enzyme to
Complex bind only one, or a very few, substrates
***Urease is VERY specific or has a HIGH DEGREE of
Specificity

apoenzyme + cofactor (whole active enzyme)

haloenzyme



protein portion of an enzyme

Apoenzyme



Non-protein compound that interacts with another
substance to facilitate a transformation.
Co factor can be:
- an inorganic molecule (metal ions) or
- an organic molecule known as a (coenzyme)

catalyze oxidation-reduction reactions (transfer electrons from one substrate to the
Oxidoreductase enzymes
next)

Dehydrogenase enzymes transfer a hydrogen from one compound to another

Transferases transfer functional groups from one substrate to another

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