Cells

• Components of blood


  • Red blood cells
  • White blood cells
  • Platelets
  • Plasma
• Red blood cells role and adaptations

  • Transports oxygen in the blood
  • No nucleus to allow more space for haemoglobin
  • Biconcave shape to give a large surface area
• White blood cells


  Cells in the blood that fight infection caused by pathogens
• Platelets


  Fragments of cells that cause clotting of blood at a wound, to reduce blood loss
• Plasma


  The liquid part of the blood, mostly made of water, but with substances like glucose, proteins, ions and carbon dioxide dissolved in it
• The nucleus is the control center of the cell, containing genetic material.
• Stem cells

  Undifferentiated cells that can become specialized. Found in bone marrow and embryo and for plants in the meristem
• magnification


  How enlarged an image is compared to its actual size
• Resolution


  Refers to how much detail can be seen in the image. difference between two points
• Conversions 


  1mm = 1000 micrometers
• Aseptic techniques


  -not growing microorganisms at body temp

  • no eating or drinking in lab
  • Using sterile loops when transferring cultures
  • Wiping benches with disenfectant
• Gamete


  Sex cells e.g sperm, ova
• Haploid cells

  Cell or nucleus of the gamete which has an unpaired set of chromosomes. Half the normal number
• Diploid cell


  Cell or nucleus of a cell that has a parked set of chromosomes
• Gene 


  section of a chromosome made from DNA that carries the code to make a protein
• Alleles


  two versions of the same gene one from your father and one from your mother