Notes Part 4 Flashcards
Who described the role of nucleus of in heredity via his experiments on the largest plant cell?
Hammerling, experiments on Acetabularia
Size of nucleus
10⁻⁶m
Name a cell with binulceate condition.
Paramoecium (MACRONUCLEUS ADN MICRONUCLEUS)
Cell with multinucleate condition. Give types as well.
Opalina is the general example.
Rhizopus, PEN (coenocytic: free nuclear division)
Epidermis of nematodes (syncitial)
Other names for nuclear membrane and nucleoplasm
Karyotheca and karyolymph
Perinuclear membrane space
10-50 nm
Nuclear lamina is?
Fibrous proteins (acidic) made of intermediate filaments which are found on the inner nuclear membrane
~provides support to it
Nuclear pore occupies what percentage of the membrane area
Meagre 10%
ANNULUS? aka?
Octagonal, Discoid structures which guard the nuclear pore and regulate nucleocytoplasmic streaming movement.
Aka BLEB.
Name the nucleoplasmin protein which forms the nuclear pore complex.
Bleb
Nuclear sap is?
Karyolymph i.e. ground substance of nucleus
Transparent, semi-fluid colloidal complex found in nucleus
Site of transcription is? It contains what?
Nucleoplasm.
Nucleoside, nucleotide, DNA polymerase, RNA polymerase
NOR refers to?
Nucleolar Organiser Region.
The specific region where chromatin is attached to the nucleolus
Non-membranous, round, dense, slightly irregular embedded in its customized ground substance
Nucleolus.
One nucleus contains one nucleoli only
Onion: 4
Oocyte nucleus of amphibians: 2000
Give percentage chemical composition of nucleolus (hint: is the factory of? So should have?)
85% protein
10% RNA
5% DNA
Give chemical composition of Chromatin
Histone: 36%
DNA: 31%
Non Histone: 28%
RNA: 2.5%
Euchromatin replicates during early/late S phase
Early.
HEREDITY VEHICLES
Chromosomes
Condensed form of chromatin refers to?
Chromosome
Best stages for the study of shape and structure of chromosomes
Shape: Ana
Structure: Meta
Name arms of submetacentric chromosome
p: “petite” (small) short arm
q: “queue” (tail) long arm
Plural of chromonemata
Trick question. Already is plural.
Chromonema is singular.
Daughter chromosomes aka?
Chromatids
