Biology: The a nature and variety of living organisms

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1. Examples of organisms

  • Cereals, mammals, yeast, chlorella, lactobacillus, influenza virus
  • Vegetables, mammals, mushrooms, HIV
  • Animals, lactobacillus, tobacco, pathogens, protein
  • DNA, cholera, insects, beans
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2. What are the characteristics of bacteria?

  • Do not have a nucleus, have a circular chromosome of DNA, can photosynthesise, single cell, feed off other organisms
  • Small, do not have a nucleus, photosynthesise, no circular chromosome DNA
  • Feed off other organisms, have a circular chromosome DNA, nucleus, multicellular
  • Reproduce rapidly, circular chromosome DNA, single celled

3. What are the characteristics of protoctists

  • Single celled, have chloroplasts
  • Single celled, microscopic, have chloroplasts, like animal cells, have a nucleus, feed off of other organisms
  • Like animal cells, have a chloroplasts, singles celled and microscopic
  • Like plant cells and animal cells

4. What is meant by the term pathogen?

  • An organism that causes disease
  • A pest that can cause disease
  • An organism that protects you from diseases
  • Something that makes you ill

5. What are the features of viruses?

  • Have a nucleus, small, reproduce, infect all types of living organisms
  • Particles rather than cells, smaller than bacteria, only reproduce inside living cells, in effect all types of organisms, come in all different shapes and sizes, do not have a cellular structure, have a protein coat around some genetic material
  • Protein coates, genetic material, different shapes and sizes, infects all type of living organisms
  • Protein coats, small, these of other organisms, single cells, chloroplasts

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