USABO USA BIOLOGY OLYMPIAD
PREP GUIDE 2025-2026 TEST
/ 1/54
, An organism whose cells
contain complex
structures enclosed
within membranes. The
defining membrane
bound structure thats
sets them apart from
prokaryotic cells is the
Eukaryote
nucleas or nuclear
envelope within which
the genetic material is
carried. All species of
large complex species
are eukaryotes, including
animals, plants and
funghi.
This shows as pale areas
in the nucleas under
electro magnification. It
is a less densly packed
Euchromatin form of chromatin; 10%
is even less condensed
and in this form it can be
actively transcribed to
produce RNA.
/ 2/54
, This shows as dark areas
on the eukaryotic
nucleas; it is densly
Heterochromatin packed chormatin (DNA
and protein complex)
which cannot be
transcribed.
Special proteins around
which DNA is wrapped.
Histones
Intermediate filament
proteins which protect
the structure of the
nucleas, they polymerize
to from a network of
Lamins filaments that lie just
within the nuclear
membrane. The network
of these filament
proteins is called the
nuclear lamina.
The network of intermediate nuclear
filament proteins (Lamins) which is located
Nuclear Lamina
just below the nuclear membrane and is
linked to the membrane and chromatin.
/ 3/54
, 9nm (approx) gaps in the
nuclear envelope that
allow the passage of RNA
and ribosomes out of the
Nuclear Pores
nucleas and the entry of
selected small proteins
and small water soluble
molecules.
An organism of the
kingdom of Monera,
comprising the bacteria
and cyanobacteria.
Characterised by the
abscence of a distinct,
Prokarayotes membrane bound
nucleas or membrane
bound organelles and by
DNA that is not
organised in to
chromosomes. Also
called moneran.
/ 4/54
PREP GUIDE 2025-2026 TEST
/ 1/54
, An organism whose cells
contain complex
structures enclosed
within membranes. The
defining membrane
bound structure thats
sets them apart from
prokaryotic cells is the
Eukaryote
nucleas or nuclear
envelope within which
the genetic material is
carried. All species of
large complex species
are eukaryotes, including
animals, plants and
funghi.
This shows as pale areas
in the nucleas under
electro magnification. It
is a less densly packed
Euchromatin form of chromatin; 10%
is even less condensed
and in this form it can be
actively transcribed to
produce RNA.
/ 2/54
, This shows as dark areas
on the eukaryotic
nucleas; it is densly
Heterochromatin packed chormatin (DNA
and protein complex)
which cannot be
transcribed.
Special proteins around
which DNA is wrapped.
Histones
Intermediate filament
proteins which protect
the structure of the
nucleas, they polymerize
to from a network of
Lamins filaments that lie just
within the nuclear
membrane. The network
of these filament
proteins is called the
nuclear lamina.
The network of intermediate nuclear
filament proteins (Lamins) which is located
Nuclear Lamina
just below the nuclear membrane and is
linked to the membrane and chromatin.
/ 3/54
, 9nm (approx) gaps in the
nuclear envelope that
allow the passage of RNA
and ribosomes out of the
Nuclear Pores
nucleas and the entry of
selected small proteins
and small water soluble
molecules.
An organism of the
kingdom of Monera,
comprising the bacteria
and cyanobacteria.
Characterised by the
abscence of a distinct,
Prokarayotes membrane bound
nucleas or membrane
bound organelles and by
DNA that is not
organised in to
chromosomes. Also
called moneran.
/ 4/54
