cells

Cards (21)

  • Function of a vacuole
    contains cell sap and keeps cell rigid and firm
  • Function of chloroplasts
    contains chlorophyll, where photosynthesis takes place to produce glucose by absorbing light energy
  • Function of cell wall
    gives cell structure and support
  • Function of cytoplasm
    jelly like substance, where chemical reactions take place
  • Fucntion of cell membrane
    controls what goes in and out of a cell
  • Function of a ribosome
    where protein sythesizes
  • Function of mitochondria
    where respiration takes place and releases energy
  • Function of nucleus
    contains DNA and controls cell activities
  • Function of plasmid DNA
    provides genetic variation for bacteria
  • Function of chromosomal DNA
    controls activity of the cell
  • Eukaryotic cells
    have a nucleus, have membrane bound organelles, ribosomes are large
  • Prokaryotic cells
    no nucleus, no membrane bound organelles, ribosomes are small
  • Mitosis
    .2 daughter cells produced
    .diploid number of chromosomes
    .genetically identical cells
    .makes body cells for growth and repair
    .asexual reproduction
  • Meiosis
    -4 daughter cells produced
    -haploid number of chromosomes
    -not genetically identical
    -makes gametes
    -sexual reproduction
  • Describe mitosis(3 marks)
    -2 daughter cells
    -diploid
    -genetically identical
  • What should happen when cells are dividing by mitosis to make body cells?

    the cells produced at the end must have a diploid number of chromosomes
  • Explain why sperm cells cannot be produced using the cell cycle(2 marks)
    sperm cells are a haploid however the cell cycle produces diploid cells
  • What is cancer?
    when a mutated cell divides uncontrollably by mitosis to form a lump of cells called a tumour.
  • Describe how to produce a microscope slide to view onion cells
    -cut a thin layer of onion
    -place the layer onto the slide
    -add one drop of a stain using iodine
    -place cover slip over the specimen at an angle
    -place slide onto the stage and secure with stage clips
  • How to prepare a slide to view an onion cell
    -peel thin layer of the onion (allows light to go through)
    -place the layer onto a slide
    -stain the cells with iodine (to make the cells more visible)
    -place a cover slip over the cells
  • Describe how to use a light microscope
    -place the slide onto the stage of the microscope and secure with stage clips.
    -select lowest magnification of objective lens
    -look through the eyepiece
    -turn the focusing wheels to make the image clearer
    -select the next highest objective lens
    -refocus