Eukaryotes: Endodymbiotic Theory Flashcards
Nucleus
Defining organelle of eukaryotic cells
What does the nucleus contain?
Genomic DNA
What is the role of the Nucleus?
Storage and expression of genetic information
What does the Nucleus do?
Forces spatial and temporal separation of transcription and translation
What are the features of the Nucleus?
Nucleolus
Nuclear Pores
Double membrane
Nucleosomes
Nuclear lamina
Nucleolus
What are the nuclear pores
Entry/exit tightly controlled by nuclear pore complex
What is the double membrane of the nucleus
Membranes are continuous with each other
Membrane is also continuous with the rough ER
What is the Nucleosome of the Nucleus
Histine octamers (2X: H2a, H2b, H3, H4)
160 bases of DNA
HIstone H1
Leads tp packing ratio of approximately 8000X
What is the nuclear Lamina of the nucleus
Mesh of protein filaments that lines the inside of the inner membrane for structural support
What does the Mitochondria do?
Specialize in energy production (ATP) via ETC
Where goes glycolysis take place in the mitochondria?
Cytosol
Where does the Krebs Cycle take place in the Mitochondria?
Mitochondrial Matrix
Where is the ETS located in the mitochondria?
Mitochondria INNER membrane
What are the features of the mitochondria?
Double membrane
Possesses its own chromosome (circular)
Replicated autonomously within the cell to meet cellular energy demands
What is chloroplast?
Specialise in converting solar energy into cellular energy (ATP) and reducing power (NADPH) that can drove the fixation of carbon dioxide into organic molecules)
Why is ATP needed for Carbon fixation in Chloroplast?
ATP provides the driving force that promotes reaction
Why is NADPH needed for carbon fixation in Chloroplasts?
NADPH provides the reducing power (electrons + hydrogens) needed for reaction
What are the features of chloroplasts?
Three membranes
Stroma
Contains its own chromosome
Replicates autonomously within the cell
What are the three membranes in the chloroplast?
Double membrane (outer and inner)
Thylakoid membrane system
contains the chloroplasts chromosome (circular)
contains photosystems/ETS
What is the stroma in chloroplasts?
the fluid-filled internal space of the chloroplasts which encircle the grana and the thylakoids. It contains chloroplast DNA, starch and ribosomes along with enzymes needed for the Calvin cycle.
Where is the chromosome in the chloroplast?
Contained within the thylakoids
When does the Endosymbiotic Theory say bacteria first appear?
3.5 billion years ago
According to Endosymbiotic Theory when did eukaryotes emerge?
1.8 billion years ago, with the development of the mitochondria