Cells Flashcards
What is the definition of eukaryotic cell?
A cell with dna in the nucleus and membrane bound organelles, bigger than prokaryotic cells
What is an example of a membrane bound organelle?
Mitochondria
How are prokaryotic cells different from eukaryotic cells?
They are smaller and have no nucleus, rather the dna is floating about in the cytoplasm. Some dna are in plasmids
What is the function of nuclei?
Stores genetic information and controls the activities of the cell
What is the function of cytoplasm?
Where the chemical reactions take place
What is the function of ribosomes?
Site of protein synthesis
What is the function of the vacuole?
Helps the cell keep its shape and stores water
What is the function of the cell wall?
Protects the cell. Very rigid and sturdy, and made of cellulose
What is the function of the chloroplasts?
Contains chlorophyll and is a site of photosynthesis which produces energy from sunlight, chloroplasts make the plant green
What is the function of pili?
For sticking to surfaces and other cells
What is the function of plasmids?
Extra lots of circular dna, can be for antibiotic resistance. Some produce toxins
What type of organelles do animal cells have? (5)
Nuclei, mitochondria, ribosomes, cell membrane, cytoplasm,
What type of organelles do plant cells have? (8)
Nuclei, mitochondria, ribosomes, cell membrane, cytoplasm, Chloroplasts, vacuole, cell wall
What type of organelles do prokaryotes have? (6)
Cell wall, plasmids, pili, cytoplasm, capsules, flagella
What is the function of flagella?
Movement
What is the cell wall (membrane?) in prokaryotes made out of?
peptidoglycan
Pre-1970, how were living things classified?
Into five kingdoms, based on observable traits
Post-1970, how were living things classified?
Into three domains
What are archaea?
Small, single called organisms that live in extreme environents (extremophiles)
Why were archaea and bacteria separated into two separate domains?
woesse decided that if these organisms (archaea) lived in extreme environments, they must be different
What are the differences between archaea and bacteria?
- dna sequencing shows their DNA is very different
- archaea ribosomes have nucleic acids more like eukaryotes
What kind of places can archaea live in?
Salt planes, very hot water, deep water, etc
What are the parts of a microscope? (4)
Eyepiece lens, objective lens, fine and coarse focusing knobs
What is the eyepiece lens for?
The first stage of magnification, where you look into the microscope
What is the objective lens for?
second stage of magnification,changes how closely magnified the image is.