Cell Structure And Function
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What is a prokaryotic domain ?
It has sno true nucleus an no membrane bound organelles
Examples of prokaryotic domain ?
Bacteria Archaea Unicellular
What is a eukaryotic domain ?
It has a true nucleus and membrane bound organelles
Examples of eukaryotic domain ?
Protist, fungi, animals , plants Usually multicellular
Name all the features of prokaryotic cells ?
No true nucleus No membrane bound organelles Smaller 70s ribosomes Cell membrane Cell wall Plasmids Capsule Flagellum Unicellular DNA exists as loops
How do prokaryotic cells divide ?
By binary fission where you have division of plasmids, then division of circular DNA then splitting forming 2 cytoplasmic daughter cells
What are the cell wall of bacteria cells made of ?
Peptidglycogen or muerin
Tell me about gram positive bacteria ?
The thick layer in gram positive bacteria is stained purple
Tell me about gram negative bacteria?
The thin layer in gram negative bacteria is stained pink
What do you call rods shaped bacteria ?
Bacillus
What do you call spheres shaped bacteria ?
Cocci
What do you call spiral shaped bacteria ?
Spirillum
What do you call thin flexible shaped bacteria ?
Spirochete
What do you call curved rod shaped bacteria ?
Vibrio
What do you call oval rod shaped bacteria ?
Cocobacillius
What are the features in eukaryotic cells in animal cells ?
Membrane bound nucleus Membrane bound organelles Cells membrane No cell wall Large 80s ribosomes for protein synthesis Mitochondria for aerobic respiration RER SER Golgi body Lysosomes
How to animal cells divide ?
By mitosis or meiosis
What features do plant cells have that animals cells don’t ?
Chloroplast Cellulose cell wall Vacuole
What features do fungi cells have in specific?
Chitin cell walls
What features do protists have ?
May have features of animals and plant or fungi but often unicellular
What is the function of the nucleus ?
Stores DNA and genetic information Site of MRNA, TRNA production
How many chromosomes in humans?
46 chromosomes And 23 pairs which come from each parent
Features of the nucleus ?
Nucleolus Nuclear pores Double membrane Nuclear envelope Nucleoplasm Chromatin which is coiled up DNA
What does the nucleolus do ?
Makes ribosomes