Biology Questions and Answers
Bacteria
- What are bacteria?
Bacteria are prokaryotic and unicellular
beings. Bacteriaorganization, they present a have simplen external (^)
cell wall, plasma membrane, circular
DNA withiribosomes fn the cytoplasmor protein synthesis. Som and (^) e
bacteriahave a polysaccharide are encapsulated, i.capsule oe., theyutside (^)
the cell wall.
- Are bacteria the only
prokaryotic beings?
Prokaryotic beings are classified into
two big groups: arcbacteria (this last also knhaebacteria aown as nd
eubacteria).
Compared to bacteria, archahave basic differences, like thebacteriae chemical (^)
compositionsand cell wall and different enzymes of their plasma membrane
related to DNA and RNA metabolism.
- What are halophile,
thermoacidophile and
methanogen archaebacteria?
There are three peculiar types of
archaebacteria. Tarchaebacteria only survive he halophilein salt- (^) rich
environments (even salinity of the sea is
not enough for them). archaebacteria are characterizeThermoacidod byphile
living under high temperatures and low
pH. The methathose that liberate mnogen archaeethane gas (bacteriaCH are
they are found in swamps.^4 ),^
- What are the main
ecological roles of bacteria?
Bacteria are responsible for the
decomposition prfood chains and food webs; in thisocess at the end of
process, they also liberate utile gases
and nutrients for other living bBacteria that live within the digestiveeings. (^)
tube of ruminants and of some insects
digest cellulose for these animals. Sombacteria also participate in the nitrogene
cycle, making fixation of nitrogen,
nitrification aalways in mutualistnd denitrification, ecological almost
interactionwithin living b with plaeings, for example, nts. Bacteria prsomeesent
that live inside the bowels, compete
with otcontrolling thher pathogenic bacteria soe population of noxious (^)
agents. There are also bacteria that
cause diseases aproduction of medical drugs.nd bacteria used in the
Excessivedestruction o proliferation of bacteria can impactr mass (^) entire
ecosystems. For example, when a river
is polluted by organic materialpopulation of aerobic bacteria increases the (^)
since the organic material is food for
them; ththen exhausts the oxygen dissolved e great number of bacteria (^) in
water and other aerobic beings (like
fishes) undergo mass death.
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