The Nucleus And Endomembrane System Flashcards
(22 cards)
Functions of the Nucleus
Stores Genetic information, the site of ribosome assembly, and where RNA is produced (transcription)
Nuclear Envelope
A double lipid Bilayer membrane that defines the nucleus (has an outer lipid Bilayer connected to the ERs)
Nuclear pores
Passages through the nuclear envelope hat regulates nuclear transport
Nucleolus
An area inside the nucleus where ribosomes are assembled
What does the nucleus contain?
Chromatin
Chromatin
Chromosomal DNA that is bound to proteins
Are enzyme complexes membrane bound?
No
Ribosomes’ Function
Synthesis proteins
Ribosomes’ structure
Made ribosomal proteins and ribosomal RNA (rRNA)
Endomembrane system components
A network of internal lipid Bilayer membranes that includes the ER, Golgi apparatus, and nucleus
ER structure
Network of interconnected tubules, wall of tubules connected of a lipid Bilayer, lumen, ERs interconnected with each other and outer lipid by layer of nuclear en envelope
Lumen
Space inside the tubes of ER
SER functions
Site of lipid synthesis, fatty acid desaturation, and cholesterol and steroid synthesis; various carbohydrates are synthethesized here
RER
Site of synthesis of proteins that are bound for export from the cell or use in the endomembrane system
Golgi Apparatus structure
Series of flattened tubes, wall of tubes are lipid Bilayer, cis face and trans face
Cis face
Receives transport vesicles from ER
Trans Face
Transport vesicles exit from Golgi
Golgi Functions
Proteins and other molecules may be modified, molecules are someter by eventual destination and released in vesicles
RER (summary)
Has ribosomes on its surface and primarily manufactures of proteins
SER (summary)
No ribosomes and are manufacturers of other macromolecules
Golgi Apparatus (summary)
Modifies, packages, and distributes macromolecules
Vesicles (summary)
Transport of molecules to and from the Golgi complex
