NATS 1670 CERTIFICATION EXAMINATION
TEST 2026 FULL QUESTIONS AND VERIFIED
SOLUTIONS
⩥ Grows over 100c: Answer: hyperthermophiles
⩥ PH. Answer: acidic or basic environments
⩥ Grows well at ph of 1 to 2 (acidic). Answer: Acidophiles
⩥ helicobacter is a cause. Answer: peptic ulcer and could cause gastric
cancer
⩥ Grows best near neutral ph. Answer: Neutrophile
⩥ Grows best at basic ph. Answer: Alkaliphile
⩥ water. Answer: * Most cells require minimum moisture content
* Some bacteria can form cells that are able to survive with the absence
of water
⩥ Salt Answer: Most require moderate levels of salt
,* Some exist in very high concentrations of salt : Halophiles
⩥ Aerobic cells Answer: require oxygen for growth
⩥ Anaerobic Answer: require lack of oxygen for growth
⩥ Nutrient availability Answer: most microorganisms require organic
and inorganic nutrients to grow and live
⩥ Cyanobacteria Answer: * grow in the absence of nutrients
cyanobacteria and photosynthetic bacteria have membrane structures
that enable them to perform photosynthesis.
⩥ 4.6B years ago Answer: earth formation begins
⩥ 4.3B years ago Answer: first water?
⩥ 3.8B years ago Answer: first evidence of life?
⩥ Archaea Answer: constitute a domain of single-celled organisms.
These microorganisms lack cell nuclei and are therefore prokaryotes
, Most archaea live in extreme environments (e.g. hot springs)
Thermoacidophiles (e.g. hot springs)
Methanogens (e.g. digestive system)
Halophiles (e.g. sea)
More similar to eukaryotes than bacteria
⩥ Fungi Answer: Yeast - eukaryotic unicellular organism
Most used in food industry
Baker's yeast made under aerobic conditions
Alcohol made under anaerobic conditions
Involved in human diseases
Yeast infections
Opportunistic infections (e.g. AIDS)
⩥ Molds Answer: filamentous fungi with a mycelial structure
Mycelium is a highly branched system of tubes containing mobile
cytoplasm with many nuclei
Molds are used for production of citric acid and antibiotics
The mold penicillium produces penicillins
Involved in allergic reactions
Aspergillosis is the group of diseases caused by aspergillus mold
TEST 2026 FULL QUESTIONS AND VERIFIED
SOLUTIONS
⩥ Grows over 100c: Answer: hyperthermophiles
⩥ PH. Answer: acidic or basic environments
⩥ Grows well at ph of 1 to 2 (acidic). Answer: Acidophiles
⩥ helicobacter is a cause. Answer: peptic ulcer and could cause gastric
cancer
⩥ Grows best near neutral ph. Answer: Neutrophile
⩥ Grows best at basic ph. Answer: Alkaliphile
⩥ water. Answer: * Most cells require minimum moisture content
* Some bacteria can form cells that are able to survive with the absence
of water
⩥ Salt Answer: Most require moderate levels of salt
,* Some exist in very high concentrations of salt : Halophiles
⩥ Aerobic cells Answer: require oxygen for growth
⩥ Anaerobic Answer: require lack of oxygen for growth
⩥ Nutrient availability Answer: most microorganisms require organic
and inorganic nutrients to grow and live
⩥ Cyanobacteria Answer: * grow in the absence of nutrients
cyanobacteria and photosynthetic bacteria have membrane structures
that enable them to perform photosynthesis.
⩥ 4.6B years ago Answer: earth formation begins
⩥ 4.3B years ago Answer: first water?
⩥ 3.8B years ago Answer: first evidence of life?
⩥ Archaea Answer: constitute a domain of single-celled organisms.
These microorganisms lack cell nuclei and are therefore prokaryotes
, Most archaea live in extreme environments (e.g. hot springs)
Thermoacidophiles (e.g. hot springs)
Methanogens (e.g. digestive system)
Halophiles (e.g. sea)
More similar to eukaryotes than bacteria
⩥ Fungi Answer: Yeast - eukaryotic unicellular organism
Most used in food industry
Baker's yeast made under aerobic conditions
Alcohol made under anaerobic conditions
Involved in human diseases
Yeast infections
Opportunistic infections (e.g. AIDS)
⩥ Molds Answer: filamentous fungi with a mycelial structure
Mycelium is a highly branched system of tubes containing mobile
cytoplasm with many nuclei
Molds are used for production of citric acid and antibiotics
The mold penicillium produces penicillins
Involved in allergic reactions
Aspergillosis is the group of diseases caused by aspergillus mold
