CCRI MICRO 2025/2026 QUESTIONS AND ANSWERS RATED
A+
✔✔A catabolic reaction is - ✔✔respiration
✔✔One NADH indirectly makes how many ATPs during electron transport? - ✔✔three
✔✔All are connected to ethyl alcohol production except - ✔✔36 ATP made
✔✔All enzymes - ✔✔work at an optimum temperature
✔✔An apoenzyme is - ✔✔an enzyme not combined with its coenzyme
✔✔What is the net gain of ATP in glycolysis? - ✔✔two
✔✔Non competitive inhibitors stop enzyme action by binding to - ✔✔a site on the
enzyme surface other than the active site
✔✔The universal energy compound is - ✔✔ATP
✔✔Anaerobic respiration - ✔✔does not require oxygen
✔✔All of the following pertain to glycolysis except - ✔✔degrades glucose to CO2 and
H2O.
✔✔All enzymes - ✔✔work best at an optimum temperature
✔✔All of the following are true about ethyl alcohol fermentation except - ✔✔produces
two FADH2
✔✔Sewage - ✔✔microbes break down sewage
✔✔Cyannobacteria - ✔✔major oxygen producer
✔✔GMO - ✔✔Due to biotech.
-can modify plasmids
✔✔Bacillus thuringiensis - ✔✔paralyzes the gut of an insect
-produces a natural pesticide to damage
-ends up being fatal to insects
✔✔Insulin - ✔✔comes from humans, made by microbes.
-humalin: made from DNA
, ✔✔Ethanol - ✔✔from fermentation, makes fuel
-microbes change corn into biofuels
✔✔Exponential growth - ✔✔Organism under ideal conditions will double within 20
minutes, and keep repeating.
Lag -> log (exponential growth) -> Stationary (dying off, still reproducing) -> Death
phase
✔✔Petroff-Hausser counting method - ✔✔count directly on grid
✔✔Serial dilution - ✔✔1 ML culture in 99 ML water- concentration 1:100
1 ML culture in 9 ML water- concentration 1:10
-important for population count (plate count)
✔✔Membrane filter - ✔✔filter solution and trap bacteria
-little pores
✔✔pH - ✔✔concentration of hydrogen ions (H+) in solution
- pH 7 is neutral
-below 7, more hydrogen ions
-above 7, less hydrogen ions
✔✔acidophile - ✔✔acid loving
✔✔alkaliphile - ✔✔alkaline loving
✔✔Most organisms that cause disease - ✔✔Mesophiles
✔✔osmotic pressure - ✔✔where extreme halophiles live
very hypotonic
✔✔Falcultative halophiles - ✔✔can live in an elevated osmotic environment
-live with more salt then usual
✔✔role of oxygen - ✔✔deadly poison
-need the major enzymes to live in oxygenated environment
(superoxide dismutase, catalase)- get rid of free radical oxygen
✔✔Aerotolerant - ✔✔don't use oxygen but can live in the presence of it
✔✔Obligate aerobes - ✔✔Grow at the top (like oxygen)
✔✔Facultative anaerobes - ✔✔would rather be an aerobes but can grow without
oxygen
A+
✔✔A catabolic reaction is - ✔✔respiration
✔✔One NADH indirectly makes how many ATPs during electron transport? - ✔✔three
✔✔All are connected to ethyl alcohol production except - ✔✔36 ATP made
✔✔All enzymes - ✔✔work at an optimum temperature
✔✔An apoenzyme is - ✔✔an enzyme not combined with its coenzyme
✔✔What is the net gain of ATP in glycolysis? - ✔✔two
✔✔Non competitive inhibitors stop enzyme action by binding to - ✔✔a site on the
enzyme surface other than the active site
✔✔The universal energy compound is - ✔✔ATP
✔✔Anaerobic respiration - ✔✔does not require oxygen
✔✔All of the following pertain to glycolysis except - ✔✔degrades glucose to CO2 and
H2O.
✔✔All enzymes - ✔✔work best at an optimum temperature
✔✔All of the following are true about ethyl alcohol fermentation except - ✔✔produces
two FADH2
✔✔Sewage - ✔✔microbes break down sewage
✔✔Cyannobacteria - ✔✔major oxygen producer
✔✔GMO - ✔✔Due to biotech.
-can modify plasmids
✔✔Bacillus thuringiensis - ✔✔paralyzes the gut of an insect
-produces a natural pesticide to damage
-ends up being fatal to insects
✔✔Insulin - ✔✔comes from humans, made by microbes.
-humalin: made from DNA
, ✔✔Ethanol - ✔✔from fermentation, makes fuel
-microbes change corn into biofuels
✔✔Exponential growth - ✔✔Organism under ideal conditions will double within 20
minutes, and keep repeating.
Lag -> log (exponential growth) -> Stationary (dying off, still reproducing) -> Death
phase
✔✔Petroff-Hausser counting method - ✔✔count directly on grid
✔✔Serial dilution - ✔✔1 ML culture in 99 ML water- concentration 1:100
1 ML culture in 9 ML water- concentration 1:10
-important for population count (plate count)
✔✔Membrane filter - ✔✔filter solution and trap bacteria
-little pores
✔✔pH - ✔✔concentration of hydrogen ions (H+) in solution
- pH 7 is neutral
-below 7, more hydrogen ions
-above 7, less hydrogen ions
✔✔acidophile - ✔✔acid loving
✔✔alkaliphile - ✔✔alkaline loving
✔✔Most organisms that cause disease - ✔✔Mesophiles
✔✔osmotic pressure - ✔✔where extreme halophiles live
very hypotonic
✔✔Falcultative halophiles - ✔✔can live in an elevated osmotic environment
-live with more salt then usual
✔✔role of oxygen - ✔✔deadly poison
-need the major enzymes to live in oxygenated environment
(superoxide dismutase, catalase)- get rid of free radical oxygen
✔✔Aerotolerant - ✔✔don't use oxygen but can live in the presence of it
✔✔Obligate aerobes - ✔✔Grow at the top (like oxygen)
✔✔Facultative anaerobes - ✔✔would rather be an aerobes but can grow without
oxygen
