B1 - Cell structure and Transport
- Created by: p_g04
- Created on: 05-06-21 16:37
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- B1 - Cell Structure and Transport
- Microscopy
- Electron Microscope
- Uses beams of electrons
- High magnification - X2 million
- Large
- Expensive
- Need to be kept in special temp, pressure, humidity controlled rooms
- Resolving power - 0.2nm
- Light Microscope
- Low magnification - X2000
- Cheap
- Uses light to form image
- Resolving power - 200nm
- Magnification= size of image/actual size
- Total magnification = magnification of eye piece lens X magnification of objective lens
- Electron Microscope
- Specialised Cells
- Animal
- Sperm cell
- Carry male DNA to egg cell for reproduction
- Streamlined head & long tail aid swimming, mitochondria supply energy for cell to move, acrosome had digestive enzymes break down layers of membrane of egg cell
- Nerve cell
- Differentiate at early stage
- Sperm cell
- Plants
- Root hair cell
- Xylem cell
- Cell types can differentiate throughout life
- Cells that are adapted to perform a specific function
- Animal
- Transport
- Osmosis
- Net movement of water from dilute solution to concentrated solution across partially permeable membrane
- Diffusion
- Spreading out of particles in a solution of gas, resulting in the net movement of particles from an area of high concentration to low concentration
- Factors that affect diffusion
- Temperature change
- Concentration gradient
- Surface area
- Active Transport
- Movement of substances from a more dilute solution to a more concentrated solution, against a concentration gradient
- Uses energy from respiration
- Osmosis
- Domains
- Prokaryotic
- Bacteria
- Cell capsule
- Cytoplasm
- Cell membrane
- Cell wall
- Chromosone
- Flagellum
- Plasmid
- Small rings of DNA
- Bacteria
- Eukaryotic
- Plants
- Chloroplast
- Photo-synthesis occurs, provide food for plant
- Cytoplasm
- Responsible for breaking down waste
- Mitochondria
- Nucleus
- Permanent vacuole
- Maintain cell shape, contains cell sap
- Cell membrane
- Cellulose cell wall
- Strengthens and supports cell
- Ribosomes
- Chloroplast
- Animals
- Mitochondria
- Respiration occurs, provide energy for cell
- Nucleus
- Carries genetic info, controls what happens in cell
- Cytoplasm
- Cell membrane
- Controls what goes in and out of cell
- Ribosomes
- Protein synthesis occurs
- Mitochondria
- Plants
- Prokaryotic
- Microscopy
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