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Lecture 8

BIOL107 Lecture Notes - Lecture 8: Jack Jumper Ant, Nuclear Membrane, Nucleolus


Department
Biology (Biological Sciences)
Course Code
BIOL107
Professor
Cirelli,Damián
Lecture
8

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Biol 107-Lecture 8: Eukaryotic Interiors Part 1
Eukaryotic Interiors Part 1
Nucleus
The nucleus is the defining feature of Eukaryotes and is about 6% of the cell
volume
It harbors the DNA and shows many sub-anatomical features
It doesn’t just hold the DNA, but also has the nucleolus which is essentially just
proteins
It is continuous with the endoplasmic reticulum
The nucleus has a membrane
Chromatin
DNA is wrapped proteinsthe entire assembly is called chromatin
Exposed area of DNA (unwrapped) is “active” in gene expression
Chromatin is packed at different densities in the nucleus according to the needs
for the access to genes
Most DNA are in the unwrapped (non-helix) form
Chromosomes
Genetic material is distributed in linear chromosome (at least 1)
Chromosomes are packed more or less loosely in the non-mitotic nucleuseach
chromosome occupies its own space
Humans have 23 pairs of chromosome (46) and the length is about 6400Mb and
20,000 genes
Some eukaryotes have a single chromosome, but it’s very rare. Ex: Jack jumper
ant
Nucleolus
Mode of several proteins and synthesizes the ribosome DNA
Assembles the ribosomes (makes ribosomes first)
Nuclear Envelope (2 Membranes)
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