lab 6

Question 1

archaea

Answer 1

• 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

Question 2

bacteria

Answer 2

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

Question 3

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

Answer 3

• 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

Question 4

how do you describe a bacterial colony (table)

Answer 4

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

Question 5

what types of fungi and bacteria did we use?

Answer 5

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

Question 6

nostoc

Answer 6

• 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)