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28 Cards in this Set
- Front
- Back
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All animal and plant cells have a:
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Nucleus, cytoplasm and a cell membrane.
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Plant cells also have a:
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Cell wall, chloroplasts and a vacuole.
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Gestation and infancy are the times of:
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Fastest growth
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All animals and plants are made of:
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Cells
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What's the function of the nucleus?
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Contains DNA which controls the activities of the cell
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What's the function of the cytoplasm?
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Contains enzymes and other chemicals – it's the site of most cell processes and reactions
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What's the function of the cell membrane?
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Regulates the movement of material into and out of the cell
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What's the function of the cell wall?
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Supports the cell, made of cellulose
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What's the function of the chloroplast
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Absorbs light energy and uses it to produce sugars in photosynthesis.
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What's the function of the large vacuole
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Provides support by exerting pressure on the cell contents. Contains a solution of minerals and other nutrients.
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Where are chloroplasts mainly found?
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In leaf cells
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Where does growth occur in a plant?
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Mainly at shoot and root tips and in special growth zones like buds
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Where does growth occur in animals? |
New cells can be made by most tissues
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How does growth occur in a plant?
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Size increase often caused by increasing the size of cells by absorbing water into the vacuole
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How does growth occur in an animal?
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Size increase is brought about by increasing the number of cells
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Cell specialisation in plants:
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Most plant cells can differentiate into different cell types
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Cell specialisation in animals:
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Only stem cells can differentiate into different cell types. Other animal cell functions remain fixed.
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Stem cells are undifferentiated cells found in [?], that have the ability to grow into different tissues |
>Animals
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Stem cells offer a possible cure for many diseases caused by:
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Cell damage
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Some people object to research using stem cells that have been taken from:
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Embryos
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Other sources of stem cells are:
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Umbilical cords and bone marrow.
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About how many weeks is human gestation? |
40 weeks
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mammals have different gestation times depending on:
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Their size, the number of offspring and how independent they are when born.
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Do large animals with a small number of independent offspring have the longest or shortest gestation.
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Longest
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To check that development is happening at normal rates, infants regularly have:
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Their mass and head circumference measured.
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What type of cells have a cell wall?
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Plant cells
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What types of cell have a cell membrane?
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All cells
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In plants where are the cells that can continue to divide and grow?
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Root and stem tips
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