What structures do plants have that aren't found in animal cells?
- fully permeable cellulose cell wall -chloroplasts - a vacuole
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What are the functions of these structures?
-Cell wall: It provides a rigid structure and gives the cell a particular shape to support itself -Chloroplasts: site of p'syn, contains chlorophyll and is only present in green part of plant
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What are the functions of these structures? (Cont.)
-Vacuole: A fluid filled space surrounded by a membrane. It contains cell sap and helps keep the shape of the cell.
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What are the functions of these structures? (Cont..)
-Cytoplasm: Where all chemical reactions take place. Cell membrane: It helps control what enters or leaves the cell. It is semi-permeable as it only allows some substances in and out
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What are the functions of these structures? (Cont...)
-Nuclear membrane: It surrounds the nucleus. It contains pores. Nucleus: The control centre of the cell and controls reactions. It contails genetic information and chromosomes. Mitochondria: The site of cell respiration.
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What is the total magnification?
eyepiece magification x magnification of objective lens used
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How do you prepare a temporary slide?
-Cut a square of onion skin using a scalpel -Peel off a thin layer of the epidermis using forceps -Place on a clean slide with a few drops of water or iodine to stop them drying out -The iodine colours the cells so that they show up -Place cover on
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What do you need to remember when using a microscope?
Start by using the lower objective lens first
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What are bacterial cells made of?
- They have a cell membrane but NO nucleus -They have plasmids (small rings of DNA) -they have free chromosomes and a cell wall (not made of cellulose)
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What is specialisation?
When thecells are designed to carry out a particular function. specialised cell > tissue > organ > organ system > organism
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Other cards in this set
Card 2
Front
What structures do plants have that aren't found in animal cells?
Back
- fully permeable cellulose cell wall -chloroplasts - a vacuole
Card 3
Front
What are the functions of these structures?
Back
Card 4
Front
What are the functions of these structures? (Cont.)
Back
Card 5
Front
What are the functions of these structures? (Cont..)
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