BIO2017: Lecture 3

HideShow resource information
  • Created by: LMoney
  • Created on: 04-04-14 14:36


  • grouped into alveolates and chromists
  • dinoflagellates- often produce potent neurotoxins- often responsible red tide phenomenon
  • ciliates- very diverse group e.g. paramecium
  • not all photosynthetic
  • haptophytes group of algae with scales on their coats- characteristic feature- additional appendage attachment for trapping prey- major carbon fixer- takes in CO2 and converts calcified scales
  • heterokonts are of most significance- largely non-photosynthetic with one exception

1) apicomplexans

  • exclusively parasitic
  • defined by presence of so-called apical complex in infective life cycle stage
  • flagella almost completely reduced only present in male gametes of some groups- no amoeboid stages
  • mitochondria with tubular cristae

sporozoites: infective stage of apicomplexan

apical complex: set of organelles at anterior end of infective stages apicomplexans- used to penetrate host cell

apicomplexans and humans:

  • some apicocomplexes are highly significant for human endeavours
  • include causal organism of malaria, most important infectious disease of humans
  • cryptosporidiosis- another important human disease- also caused by apicomplexan 


  • causative agent of malaria
  • most serious forms of disease in humans- caused by plasmodium falciparum and plasmodium vivax
  • P. falciparum is responsible for 80% of infections and 90% of deaths
  • malaria parasites don't only infect humans- many types of simian, rodent and bird…


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all BIO2017 resources »