Biology B2.1
- Created by: conniecartwright
- Created on: 29-03-16 16:32
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- Cells, tissues and organs.
- Structure that cells have in common:
- Nucleus: Control's cell activities.
- Cytoplasm: where chemical reactions take place.
- Cell membrane: controls movement of materials in and out of the cell.
- Mitochondria: Where energy is released during aerobic respiration.
- Ribosomes: Where protein synthesis takes place.
- Plant and Algal cells also have:
- Cell wall made of cellulose: for support.
- Chloroplasts that contain chlorophyll for photosynthesis.
- Permanent vacuole: contains cell sap.
- Yeast is a single-celled organism.
- Yeast cells have a nucleus, cytoplasm and a membrane surrounded by a cell wall.
- Root hair cells:
- Increase the surface area of the root so that it can absorb water and mineral ions efficiently.
- Diffusion:
- Dissolved substances and gases can move into and out of cells by diffusion.
- The larger the concentration gradient, the faster the rate of diffusion.
- Tissues and organs:
- Animal tissues include:
- Muscle tissue, glandular tissue and epithelial tissue.
- Plant tissues include:
- Epidermal tissue, mesophyll, xylem and phloem.
- The stomach is an organ made of: muscular tissue, glandular tissue and epithelial tissue.
- The leaf, stem and root are organs which contain epidermal tissue, mesophyll, xylem and phloem.
- Animal tissues include:
- Structure that cells have in common:
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