Micro Exam 2b

Question 1

what are the different protozoans?

Answer 1

• amoeba, flagellates
• ciliates
• sporozoa, coccidia
• microsporidia

Question 2

what are the different metazoans?

Answer 2

• flatworms
• flukes
• tapeworms

Question 3

characteristics of fungi

Answer 3

• can both harm and benefit the human being
• classified by biochemical tests and physical appearance
• multicellular for the most part , minus yeast who are unicellular
• molds and fleshy fungi contain a thallus (body) composed of long filaments of cells joined by hyphae
• dimorphic
• reproduction occurs in both sexual and asexual forms via the formation of spores
• aerobic or facultatively anaerobic
• chemohetertrophs

Question 4

septate hyphae

Answer 4

segmented molds

Question 5

coenocytic hyphae

Answer 5

continuous molds

Question 6

mycelium

Answer 6

large filamentous mass of hyphae

Question 7

unicellular fungi’s way of division

Answer 7

• budding (asymmetrical)

- fission (symmetrical)

Question 8

asexual spores

Answer 8

formed by hyphae and germinate to produce genetically identical daughter cells

• more common
• sporangiospores and conidiospores

Question 9

sexual spores

Answer 9

result from fusion of nuclei from 2 opposite mating strains of same species and result in genetically diverse daughter cells

Question 10

mycosis

Answer 10

fungal infection

Question 11

dimorphism

Answer 11

pathogenic fungi that contain this quality are yeastlike at 37 degrees Celsius and mold like at 25 degree Celsius

Question 12

intermediate host

Answer 12

host that harbors the asexually reproducing stage of an organism

Question 13

definitive host

Answer 13

host that harbors the sexually reproducing stage of an organism

Question 14

two advantages of fungi

Answer 14

• can help in production of foods

- used for biological control of pests

Question 15

two disadvantages of fungi

Answer 15

• cause food spoilage

- can cause disease in plants

Question 16

characteristics of algae

Answer 16

• eukaryotic photoautotrophs
• reproduce asexually by cell division and fragmentation
• many reproduce sexually though
• classified according to their structures and pigments

Question 17

five phyla of algae

Answer 17

• brown algae
• red algae
• green algae
• diatoms
• dinoflagellates

Question 18

brown algae

Answer 18

kelp

Question 19

red algae

Answer 19

grow deepest in the ocean

Question 20

green algae

Answer 20

have cellulose and chlorophyll a and b and store starch

Question 21

diatoms

Answer 21

unicellular and have pectin and silica cell walls

- produce neurotoxin

Question 22

dinoflagellates

Answer 22

produce neurotoxins that cause paralytic shellfish poisoning

Question 23

characteristics of protozoans

Answer 23

• unicellular, eukaryotic chemoheterotrophs
• found in soil and water and are normal microbiota of animals
• asexual reproduction by fission, budding and schizogany
• sexual reproduction by conjugation
• can have protective structure in the form of a cyst (capsule)
• contain complex walls
• trophozoite
• lack mitochondria
• use pseudopods to move

Question 24

ciliate conjugation

Answer 24

two haploid nuclei fuse to produce a zygote

Question 25

trophozoite

Answer 25

the feeding and growing stage in protozoa

Question 26

apicomplexa

Answer 26

non-motile, obligate intracellular parasite, protozoan

Question 27

euglenozoa

Answer 27

two groups of flagellated cells - euglenoids - hemoflagellates

Question 28

euglenoids

Answer 28

photoautotrophs, flagellum and red eyespot at anterior end, senses light

Question 29

hemoflagellates

Answer 29

transmitted by blood feeding insects