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NATS 1670 - Test #1 | Questions And Answers | Latest Update
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NATS 1670 - Test #1 | Questions AndAnswers | Latest Update
What do all cells have in common? Correct Ans - DNA, RNA, Proteins &
Enzymes, Cell Membrane, ATP (energy)
What do eukaryotes have that prokaryotes don't? Correct Ans -
nucleus, organelles, RNA processing
what bacteria grows best below 20 degrees? Correct Ans -
psychrophiles
what bacteria grows best between 20-50 degrees? Correct Ans -
mesophiles
what bacteria grows best over 50 degrees? Correct Ans - thermophiles
and hyperthermophiles
what is an example of an acidophile? Correct Ans - helicobacter pylori:
causes peptic ulcers, and if left untreated, gastric cancer
what are spores and what can they do? Correct Ans - reproductive cell
formed by bacteria that can grow with the absence of water
what are halophiles? Correct Ans - archaea that can grow in high levels
of salt
do all bacteria require oxygen to live? Correct Ans - no, anaerobic
bacteria do not need oxygen to survive
what can cyanobacteria do? Correct Ans - cyanobacteria can grow in
the absence of nutrients: gain their energy through photosynthesis
what life form occupied earth first? Correct Ans - prokaryotes
, what are some types of archaea and where do they live? Correct Ans -
thermoacidophiles (hot springs), methanogens (digestive system), halophiles
(sea).
what is yeast? Correct Ans - eukaryotic unicellular organism
where can yeast be found? Correct Ans - baking (aerobic), alcohol
(anaerobic), yeast infections
what are molds and where are they used? Correct Ans - filamentous
fungi with mycelial structure, used in creation of antibiotics and citric acid
what is mycelium? Correct Ans - highly branched system of tubes
containing mobile cytoplasm and nuclei
what are protozoa? Correct Ans - unicellular eukaryotic organisms
that lack a cell wall
what are some beneficial roles of protozoa? Correct Ans - digestion
and removing bacteria from wastewater
what are viruses? Correct Ans - complexes of nucleic acids and
proteins, parasites of cellular life
what do viruses contain? Correct Ans - DNA/RNA, Protein coat for
protection, and lipid envelope
what percentage of living organisms are undiscovered? Correct Ans -
90%
who was the first person to view through a cell and when? Correct Ans -
Anton van Leeuwenhoek, 1670
describe a light microscope Correct Ans - uses light energy, ~1000x
magnification, shows live 2D specimen
describe an electron microscope Correct Ans - uses electron beam
wavelength, ~2,000,000x magnification, shows 3D specimen, however they
die due to high radiation
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