lab 6 Flashcards

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1
Q

archaea

A
  • no nuclei
  • ancient group of poorly-known prokaryotes
  • live in extreme environments like thermal vents, salt springs, hot springs, swamps and marshes where other life forms are absent
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2
Q

bacteria

A
  • no nuclei
  • better known
  • consist of heterotrophic bacteria and a group of photoautotrophic bacteria Cynanobacteria (formerly known as blue green algae)
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3
Q

what do archara and bacteria have in common? groups of prokaryotes

A
  • no nuclei
  • single stranded circular chromosome which is concentrated in one area of their cells (called the nucleoid) but not enclosed by a nuclear membrane. small size (1 to 10 micrometers)
  • used to be classified under plantae but their cell walls do not contain cellulose and contain other molecules such as peptidoglycan
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4
Q

how do you describe a bacterial colony (table)

A
  • approximate size of colony
  • overall shape of colony
  • margin or edge of colony
  • surface texture
  • elevation of colony
  • colour of colony
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5
Q

what types of fungi and bacteria did we use?

A

bacteria: chromobacterium violaceum (purple in colour) and micrococcus luteus
fungi: rhizopus stolonifer (a filamentous mold) and saccharomyces cerevisiae (single celled yeast)

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6
Q

nostoc

A
  • belongs to a group of bacteria (cyanobacteria) whose cells are larger
  • blue-green in colour
  • nostoc forms filaments or chains of cells which adhere to each other by their gelatinous sheaths
  • nitrogen fixing bacteria (makes inorganic nitrogen compounds from the free nitrogen found in the atmosphere)
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