Biology Questions and Answers
- Do bacteria cells have a
nucleus?
In bacteria the genetic material is
disperseinternal md in the cytosolembrane that delimits and there is no a
nucleus.
- Are there any bacteria
made of more than one cell?
There are no pluricellular bacteria. All
bacteria are unicellular prokaryotic.
- What is the plasma
membrane of the cell? What
are its main functions?
The plasma membrane is the outer
membrane of the cell, it ditself and a cell interior with spelimitsecific the cell
conditions for the cellular function.
Since it is selectivelyplasma membrane has an permeable, theimportant
role for the passage oinwards or outwards.f substances
- What are the chemical
substances that compose the
plasma membrane?
The main comembrane are phospholipinstituents of the plasmads, proteins (^)
and carbohydrates. The phospholipds,
amphipathic molorganized in the membrane accorecules, are regularlyding to (^)
their polarity: two layers of
phospholipithe polar pads form the lipid bilayer withrt of the phospholipids
pointing to the exterior of the layer and
the non-polar phospholipiinterior. Proteins can be foundd chains i n the
embedded in the lipid bilayer and there
are also some proteins and to phospholipids icarbohydrates bn theound to
outer face of the membrane.
- What is the difference
between plasma membrane
and cell wall?
Plasma membrane and cell wall are not
the same called cell memthing. brane, is thPlasma membrane outere, also
membrane common to all living cells
and it is madembedded proteins ae of a phospholipid bilayer,nd some appended (^)
carbohydrates.
Because some types of cells there are even outercell membranes are fragile, in (^)
structures that sumembrane, like the cellulose pport and protect thewall of
plant cells and the chitin wall of some
fungi cells. Most ban outer cell wall maacteriade of also present
peptidoglycans and other organic
substances.
- What are the main
respective constituents of cell
walls in bacteria, protists,
fungi and plants?
In bacteria the cell wall is made of
peptidoglycans; amohave cell walls made of cellulng protists algaeose; in
fungi, the cell wall is made of chitin (the
same substance that makes the
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