cell structure and transport
- Created by: shakirah miah
- Created on: 20-12-20 20:57
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- cell structure and transport
- diffusion
- Diffusion is the movement of a substance from an area of high concentration to an area of low concentration.
- Diffusion happens in liquids and gases because their particles move randomly from place to place.
- osmosis
- Osmosis is the diffusion of water molecules, from a region where the water molecules are in higher concentration
- o a region where they are in lower concentration, through a partially permeable membrane.
- prokaryotes and eukaryotes cells
- Cells of bacteria are called prokaryotic cells.
- Cell membrane - surrounded by cell wall
- Cytoplasm, ribosomes, no mitochondria or chloroplasts
- Cells of animals, plants and fungi are called eukaryotic cells.
- Cell membrane - surrounded by cell wall in plants and fungi
- Cytoplasm, cell organelles include mitochondria, chloroplasts in plants and ribosomes
- Cells of bacteria are called prokaryotic cells.
- animal and plant cells
- Cytoplasm-A jelly-like material that contains dissolved nutrients and salts and structures called organelles.
- Nucleus-Contains genetic material, including DNA, which controls the cell’s activities
- Mitochondria-Organelles that contain the enzymes for respiration, and where most energy is released in respiration.
- Ribosomes-A tiny organelle where protein synthesis occurs.
- active transport
- Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration.
- The particles move against the concentration gradient, using energy released during respiration.
- Examples of active: transport include: uptake of glucose by epithelial cells in the villi of the small intestine
- uptake of ions from soil water by root hair cells in plants
- Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration.
- cells and microscopes
- light microscopes are used to study living cells and for regular use when relatively low magnification and resolution is enough
- Magnification of the microscope = magnification of eyepiece × magnification of objective
- If the magnification of an eyepiece is ×10 and the objective is ×40, what is the magnification of the microscope?
- answer×400. Because 10 × 40 = 400.
- diffusion
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