B1 Flashcards
(21 cards)
What equation links image size, size of real object and magnification together?
image size=size of real object x magnification
What are the 7 parts of a light microscope?
eyepiece, objective lens, stage, slide, coarse and fine focus and light
Give 3 advantages of light microscopes?
1.Its cheaper than electron microscope
2.Its easy to use and handle
3.Relatively cheap
4.Can view live samples of specimen
Give 3 advantages of electron microscope?
1.Higher magnification and resolution
2.Can analyse structure of cells which others can’t
3.Provide clear understanding of cellular structure and function
What are the 5 sub cellar structure in an animal cell?
Nucleus, ribosome, mitochondria, cytoplasm and cell membrane
What are the 8 sub cellar structure in a plant cell?
Nucleus, ribosome, mitochondria, cytoplasm and cell membrane, vacuole, cellulose cell wall, chloroplast,
What’s the function of a nucleus?
Controls all the activities of the cel and it contains mRNA needed for protein synthesis
What’s the function of a ribosome?
It’s where protein synthesis takes place and creates all the protein the cellneeds.
What’s the function of a mitochondria?
It’s where aerobic respiration takes place to release energy for the cell.
What’s the function of a cell membrane?
Controls the passage of substances that enter and leave the cell.
What’s the function of a cytoplasm?
A liquid gel where the organelles are suspended and its where most of the chemical reactions take place.
What’s the function of a vacuole?
A place in the cytoplasm which contains cell sap which keeps the cell rigid.
What’s the function of a cell wall?
It strengthens the cell and provides support to it.
What’s the function of a chloroplast?
They contain chlorophyll which absorbs light to photosynthesise.
What cells are eukaryotic?
Animal and plants cells are examples.
What cells are prokaryotic?
Bacteria cells
Difference between eukaryotic and prokaryotic?
Eukaryotic has cell membrane, cytoplasm and genetic material enclosed in the nuclei.
What’s diffusion?
It’s the movement of any substance from a net movement of high concentration to low concentration, down a concentration gradient.
What’s osmosis?
It’s the movement of water from a dilute to more concentrated solution through a partially permeable membrane which allows water to pass through.
Difference between plasmolyed and turgid.
Turgid is when no more water can enter the plant cell so it becomes hard and rigid because of the pressure
What’s active transport?
The movement of substances against their concentration gradient. The substance moves from an area of low concentration to an area of high concentrations, across a partially permeable membrane. This process requires energy produced from cell respiration.
