Eating habits - 11th set

Question 1

protozoas are (1)

Answer 1

microscopic, unicellular eukaryotic organisms ( functions are integrated into one cell) digestion, excretion, metabolism

Question 2

Cytoplasm is typically divided (ghost)

Answer 2

ectoplasm and endoplasm - other membrane bound organelles are present

Question 3

Vacuoles (lurking)

Answer 3

conspicuous organelle seen in some members

Question 4

Contractile vacuoles (contract plumber)

Answer 4

regulates fluid within the cells avoids cell bursting; no preventive cell wall is present

Question 5

Food vacuole (grocery bag)

Answer 5

membranous sac formed by the plasma membrane, fuses with lysosomes (contain many digestive/hydrolytic enzymes) inside cell. protozoans ingest food particles.

Question 6

Some have 2 nuclei within cell- Micronuclei (joon)

Answer 6

required for sexual reproduction; contains normal chromosomes

Question 7

Specific motility appendages are present amongst members (wig)

Answer 7

• cilia and flagella (differ in structure from prokaryotes )

Question 8

They lack…(pellet)

Answer 8

a rigid cell wall; pellicle may be present ( flexible outer covering)

Question 9

Some are…(free living)

Answer 9

parasites, majority are free living - require large amount of moisture (aquatic)

Question 10

They form important part of the…(exception)

Answer 10

food chain; exceptions are the human pathogen. eaten by smaller fish, who are eaten by larger fish.

Question 11

Oxygen, water and nutrients..

Answer 11

(small, lipid soluble) diffuse readily through their plasma membrane (aquatic habitat facilitates that)

Question 12

They have a complex…

Answer 12

life cycle ( more than one habitat and host ) host can be vertebrate or invertebrate

Question 13

Many protozoans are…(poly)

Answer 13

polymorphic

Question 14

morphologically distinct stages are…(poly - door)

Answer 14

seen during protozoan life cycle. polymorphic forms could be either trophozoite or the cysts

Question 15

Trophozoite (trough)

Answer 15

vegetative or the feeding stage

Question 16

Cysts stage (hs) is for…

Answer 16

resting form with dormant cytoplasm

• is means of survival and dispersal to new host

Question 17

Cysts are equivalent…

Answer 17

to endospores but are not resistant to heat and other adverse environmental conditions

Question 18

Cysts encounter favorable conditions…(win)

Answer 18

several trophozoites emerges

Question 19

Cysts formation is triggered by (nuclear)

Answer 19

nutrient limitation low moisture low temperature radiation presence of toxic compound

Question 20

Some have 2 nuclei within cell - Macronuclei (dev)

Answer 20

is derived / originates from micronuclei - role in routine cellular functions and asexual reproduction

Question 21

2 stages in protozoa life cycle

Answer 21

trophozoites and dormant cysts