Study

Cells

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  • In which part of the cell do metabolic reactions occur/take place?
    In the cytoplasm.
  • What is the function of chlorophyll?
    Chlorophyll absorbs energy from the sunlight to be used by the plant to make food.
  • What two parts of the cells are found in plant cells but not animal cells ?
    1- cell wall & 2- chloroplasts
  • Are cell membranes present in all organisms ?
    Yes
  • What are animal vesicles made of ?
    Water or nutrients.
  • What is the percentage of water in cells ?
    70%
  • Is the cell membrane permeable or partially permeable?
    Partially permeable (it is a very thin layer)
  • What is a word for an organism with only one cell ?
    Unicellular
  • Do animals have a cell wall?
    No
  • Are plant vacuoles or animal vesicles bigger ?
    Plant vacuoles are much bigger.
  • Are animal cells often regular shape?
    No
  • Why are cell walls important?
    It stops the cell from bursting if it absorbs a lot of water.
  • What is a cell wall made of ?
    Cellulose
  • What is the cell sap in a plant cell made of?
    Sugars and order substances. (Cell sap is a solution made of sugars and other substances)
  • In what part of the nucleus is the genetic information of the organism kept ?
    In the chromosomes.
  • Name the two types of microscopes.
    1- light microscope. 2- electron microscope
  • What is the cell membrane made out of?
    Protein and fat
  • What is a nucleus?
    A nucleus is where all the genetic of organism is kept.
  • Up to how much can an electron microscope magnify?
    An electron microscope is able to magnify up to 10 million times. (x10 million)
  • Are plant cells often regular in shape ?
    Yes
  • How many times can a good light microscope magnify ?
    A very good light microscope can magnify up to 1500 times(x1500).
  • Are animal cells often regular in shape ?
    No, they are often irregular in shape.
  • In what way does the nucleus help the cell ?
    The nucleus helps the cell make the right sorts of proteins.
  • What are animal ‘vacuoles’ called ?
    Vesicles
  • Name the 7 characteristics of living organisms. Briefly explain them.
    1- movement. 2- respiration. 3- sensitivity. 4- growth. 5- reproduction. 6- excretion. 7- nutrition.
  • What is a vacuole surrounded by a plant cell ?
    By a membrane.
  • Are cell walls fully permeable or not permeable ?
    Cell walls are fully permeable; because of the spaces between fibers of crisscrossed cellulose which allows even larger molecules to go through.
  • How does a vacuole help a plant cell to be kept in shape ?
    The vacuole presses outward on the rest of the cell (and helps it to stay in shape)
  • What is a substance found in chloroplasts that is similar to starch, but that is not starch and is pressent in animals?
    Glycogen
  • What is that solution which surrounds the vacuoles in a plant cell called?
    Cell sap
  • What is the formula for magnification ?
    Magnification = size in drawing or photograph / size of the real object
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