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Maggle11
Biology revision
| Question | Answer |
|---|---|
| Name a substance that diffuses into body cells | Oxygen, glucose |
| Name a substance that diffuses out of body cells | Carbon dioxide |
| What is the definition of diffusion? | Diffusion is the movement of molecules down a concentration gradient. |
| Is diffusion active or passive? | passive |
| Is osmosis active or passive | passive |
| Osmosis is the diffusion of what? | water |
| What is the definition of osmosis? | The movement of water down a concentration gradient through a selectively permeable membrane. |
| What word is used to describe plant cells that have gained water by osmosis? | Turgid |
| What word is used to describe plant cells that have lost water by osmosis? | Plasmolysed |
| What is the definition of active transport? | The movement of molecules or ions against a concentration gradient. |
| Does active transport require energy? | yes |
| Does active transport need a membrane protein? | yes |
| Does diffusion require a membrane protein? | No |
| Does diffusion require energy? | No |
| Name an ion that moves by active transport. | Potassium (or sodium) |
| What are the building blocks of proteins called? | Amino acids |
| What is the name for an enzyme controlled reaction that builds smaller molecules into bigger ones. | Synthesis reaction |
| What is the name for an enzyme controlled reaction that breaks big molecules down to smaller ones. | Degradation reaction |
| What do enzymes do? | Speed up chemical reactions. |
| Are enzymes re-useable | Yes |
| What is the name for the part of the enzyme where the reaction takes place? | Active site |
| What is the name for the substance(s) that binds to the enzyme for the reaction to take place? | Substrate |
| What is the word for the temperature where enzyme activity is at its greatest rate | Optimum |
| What is the word for when enzyme activity stops at high temperatures. | Denatured |
| What is the word for when enzyme activity stops at a certain pH | Denatured |
| What is the word for the pH where enzyme activity is at its greatest rate | Optimum |
| What is the optimum pH for most enzymes? | 7 |
| Habitat | The place an organism lives in an ecosystem |
| Carnivore | An ANIMAL that eats another ANIMAL for energy |
| Omnivore | An ANIMAL that eats plants OR animals for energy |
| Herbivore | An ANIMAL that eats plants for energy |
| Consumer | An ANIMAL that eats other ORGANISMS to get energy |
| Producer | A GREEN PLANT that produced food by photosynthesis |
| Cell wall | Gives strength and support |
| Cell membrane | Controls the entry & exit of materials from the cell |
| Cytoplasm | Site of chemical reactions |
| Nucleus | Control centre of cell, contains DNA |
| Chloroplast | Site of photosynthesis |
| Vacuole | Stores cell sap |
| Mitochondria | Site of aerobic respiration |
| Ribosomes | Site of protein synthesis |
| Population | The number of organisms of ONE species in an ecosystem |
| Community | All the living things in an ecosystem (including microbes) |
| Biodiversity | The variety of living things in an ecosystem |
| Niche | The role an organism plays in an ecosystem |
| What is the first stage of photosynthesis called? | The light Reactions |
| What are the 2 raw materials needed for photosynthesis? | Carbon dioxise and Water |
| What is the second stage of photosynthesis called? | Carbon Fixation |
| What are the products of photosynthesis? | Sugar and Oxygen |
| What are the 3 fates of the sugar produced in photosynthesis? | 1. Used in respiration 2. Stored as starch 3. Converted into Cellulose |
Created by:
nscobie
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