Science Biology Add Pt 1
- Created by: caseywhite
- Created on: 02-04-15 18:02
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- Plant & Animal Cells
- Biology Add Pt1
- Diffusion
- Cells & Diffusion
- Diffusion is the spreading of the particles of a gas, or of any substance in solution
- Resulting in a net movement from a region where they are of higher concentration, into a region where they are in a lower concentration.
- Most cells need oxygen so that they can respire.
- Oxygen diffuses into the cells from a higher concentration outside to a lower concentration inside.
- The concentration of oxygen inside a cell is kept low because the cell keeps on using it up.
- Diffusion is the spreading of the particles of a gas, or of any substance in solution
- A Model Cell
- Visking tubing contains millions of tiny holes which only let small molecules like water diffuse through.
- Large molecules, such as starch, cannot cross the membrane. We say it is partially permeable.
- This is similar to a cell membrane. Visking tubing can therefore be used as a model of a cell
- Visking tubing contains millions of tiny holes which only let small molecules like water diffuse through.
- Cells & Diffusion
- Specialised Cells
- The Human body contains hundreds of different kinds of specialised cells
- Red Blood Cells
- Goblet Cells
- Ciliated Cells
- Specialised Plant Cells
- Root-hair cells are specialised plant cells
- They are fine hair-like extensions of a root.
- Their large surface area enables plants to maximise their absorption of water from the soil.
- Root-hair cells are specialised plant cells
- The Human body contains hundreds of different kinds of specialised cells
- Photosynthesis
- The word of equation for photosynthesis is:
- carbon dioxide + water (+ light energy) ? glucose + oxygen
- Chlorophyll and light absorption
- White light is a continuous spectrum of colours, from red to violet
- Different parts of the spectrum have their own characteristic wavelengths
- Short wavelength light looks blue
- Long wavelength light looks red
- Chlorophyll looks green because it bsorbs the blue and red parts of the spectrum and reflects the green part
- Different parts of the spectrum have their own characteristic wavelengths
- Light energy is absorbed by chlorophyll of plant cell
- White light is a continuous spectrum of colours, from red to violet
- In photosynthesis light energy is stored in glucose molecules
- Glucose can be converted into starch and stored for later use.
- Starch molecules are big and unlike glucose cannot diffuse out of cells.
- Glucose can be converted into starch and stored for later use.
- The energy is transferred to animals when they eat the plants.
- The word of equation for photosynthesis is:
- Diffusion
- Animal Cells
- Nucleus
- A large substance inside the cell. It contains chromosomes made of DNA. The nucleus controls the activities of the cell.
- Cytoplasm
- A jelly-like substance containing many chemicals most of the chemical reactions of the cell occur here
- Cell Membrane
- A thin layer around the cell. It controls the movement of substances into and out of the cell.
- Mitochondria
- Small rod-shaped structures that release energy from sugar during aerobic respiration
- Ribosomes
- Small ball shaped structures in the cytoplasm where proteins
- Nucleus
- Plant Cells
- Chloroplasts
- Small discs found in the cytoplasm. They contain the green pigment chlorophyll. Chlorophyll traps light energy for photosynthesis.
- Cell Wall
- A layer outside the cell membrane. It is made of cellulose, which is strong and supports the cell.
- Permanent Vacuole
- A fluid filled cavity. The liquid inside is called cell sap. The sap helps support the cell.
- Chloroplasts
- Biology Add Pt1
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