B4: Processes Of Life
Everything you need to know about the unit B4 are in these flashcards. If you can get over half of these flashcards right your going to do fine in your exam :)
Hope they help you.
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- Created by: Kayleigh <3
- Created on: 24-05-13 17:27
What does Mrs. Gren stand for?
M - Movement, R - Respiration, S - Sensitivity, G - Growth, R - Reproduction, E - Excrection and N - Nutrition.
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In what part of the cells in plants to chemical reactions occur?
Cytoplasm is the part of the cell in plants where chemical reactions occur to help the plant survive.
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What are enzymes?
Enzymes are proteins that speed up the rate of a chemical reaction.
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At what temperature do enzymes denature?
At 60'c enzymes denature as it is over their optimum temperature.
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Describe the key and lock model?
The key and lock model is illustrating the fact that enzymes are specialised and specific. Only one molecule with the correct shape can fit in the enzyme, hence the 'key and lock model' only one molecule can fit into the enzyme due to its shape.
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What is the part of the enzyme called that allows it to bind to the enzyme to speed up a specific reaction?
The active site.
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What happens if there is a change in the active site?
If there is a change in the active site it changes the shape of the active site this will stop the enzyme from working, it becomes denatured.
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Two factors that affect enzymes?
The pH affects the enzyme as tehy can only work at a specific pH, if it is not that pH the enzyme will stop working. The temperature has the same effect as the pH as it the temperature is over 60'c they denature and will stop working.
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Describe the process of active transport?
Active Transport is the process of molecules dissolving across a semi permeable membrane from a lower to a higher concentration.
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Explain the process of photosynthesis?
Photosynthesis is the process in which plants use energy from sunlight to convert carbon dioxide and water into molecules needed for growth,these include chlorophyll, glucose, and enzymes.
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Describe the job of chlorophyll?
The job of chlorophyll is to absorb light energy, which allows the production of glucose by the reaction between carbon dioxide and water.
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What's the word equation for photosynthesis?
Carbon dioxide + water -------> glucose + oxygen
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What's the chemical equation for photosynthesis?
6C O2 + 6H2 O ----> C6 H12 O6 + 6O2
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What is glucose made up of?
Glucose is made up of carbon, hydrogen and oxygen.
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Name the 3 ways that glucose if used?
Firstly,converted into chemicals required for growth. Secondly, converted into starch a storage molecule ready to be converted into glucose when needed. Thirdly, can be broken down during respiration releasing energy.
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A plant cell is made up of many structures, name 6 different structures?
Chloroplasts, nucleus, cell membrane, vacuole, cell wall and cytoplasm.
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Name the job of the vacuole in a plant cell?
The job of the vacuole is to contain the cell sap to keep the cell turgid.
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What is diffusion?
Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
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Describe how diffusion happens in a cell when a plant is photosynthesising?
In a cell when photosynthesis occurs the movement of oxygen and carbon dioxide is happening in leaves.The higher concentration of carbon dioxide diffuses into the leaf for photosynthesis.
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What is osmosis?
Osmosis is the movement of water from a less concentrated solution to a more concentrated solution through a partially permeable membrane.
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Why is osmosis important in plants?
Osmosis is important to plants. They gain water by osmosis through their roots. Water moves into plant cells by osmosis, making them turgid or stiff so they that able to hold the plant upright.
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Name 3 factors that effect the rate of photosynthesis?
Light intesnsity: without enough light, a plant cannot photosynthesise very quickly. Carbon Dioxide Concentration: a plant cannot photosynthesise if there is insufficient carbon dioxide. Temperature:a plant cannot photosynthesise if there is insuffi
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What are quadrats used for?
A quadrat can be used to survey the plants present in a square metre.
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What's an indentification key?
An identification key can then be used to identify species present, so a link may be formed between light level and species present.
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What are the 2 types of respiration?
There are two types of respiration, aerobic (uses oxygen) and anaerobic (does not use oxygen).
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What is respiration?
energy is released from cells by a series of chemical reactions this process is called respiration
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Describe aerobic respiration?
Aerobic respiration needs oxygen to work. Most of the chemical reactions involved in the process happen in tiny objects inside the cell cytoplasm, called mitochondria.
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What is the word equation of aerobic respiration?
glucose + oxygen → carbon dioxide + water (+ energy)
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Describe anaerobic respiration?
Anaerobic respiration is a type of respiration that does not use oxygen. It is used when there is not enough oxygen for aerobic respiration.
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What is the word equation for anaerobic respiration?
glucose → lactic acid (+ energy released)
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Name the different parts of a bacterium cell?
Molecule of circular DNA, cell membrane, cell wall and cytoplasm.
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Name the different parts of a yeast cell?
Nucleus, cell membrane, cell wall and cytoplasm.
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Describe the idea of sustainability?
Sustainability is the idea of using resources to meet the needs of the present without damaging the Earth or using up resources people might need in the future.
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What is biogas?
Biogas is a fuel manufactured using animal manure (or sometimes human waste). Biodigesters are used to convert the manure into biogas.This gas can then be used as a fuel to run generators and heat buildings.
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Other cards in this set
Card 2
Front
In what part of the cells in plants to chemical reactions occur?
Back
Cytoplasm is the part of the cell in plants where chemical reactions occur to help the plant survive.
Card 3
Front
What are enzymes?
Back
Card 4
Front
At what temperature do enzymes denature?
Back
Card 5
Front
Describe the key and lock model?
Back
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