Quiz 9

Question 1

Protozoa
- Know their major properties

Answer 1

unicellular eukaryotes that generally lack photosynthetic ability
- lack a cell wall, but often contain a rigid material under the plasma membrane

Question 2

Protozoa
- Know the difference between a trophozoite and cyst

Answer 2

trophozoite phase: active eating/growing form
cyst: resting, protected stage better for survival/spread

Question 3

What are the two ways in which protozoa reproduce asexually? What is schizony?

Answer 3

Binary : chromosomes are copied and separated and the cells split
Schizony process:
1) nucleus divides many times, each cell contains many nuclei
2) small portions of cytoplasm surround each nuclei and the cells separate into daughter cells

Question 4

What are the two major ways in which protozoa reproduce sexually?
- Know the process of conjugation and how it works

Answer 4

some species undergo meiosis to produce haploid gametes, and the gametes fuse to produce a diploid zygote

conjugation
- 2 nuclei, micronucleus and a micronucleus
1) two cells fuse and the haploid micronuclei are exchanged
2) they fuse into a new diploid micronucleus
3) this new micronucleus replaces the micronucleus

Question 5

How are protozoa classified?

Answer 5

classified based on locomotion

Question 6

Know the basic properties of the flagellates – what are flagella and what do they do? What are undulating membranes?

Answer 6

Flagellates have long whip-like tails called flagella that they use to move, acquire food, and sense their surroundings
- some have an undulating membrane which folds in a wave-like movement

Question 7

Flagellates
- What happens if they lack mitochondria?
– know that some cause disease

Answer 7

if they lack mitochondria, then they must obtain ATP from a host, and in this way they are obligate parasites

Question 8

How do amoeba move and obtain food? What are pseudopodia?

Answer 8

Amoeba move and obtain food using arm-like membrane structures called pseudopodia

Question 9

What are cilia and how do they work?

Answer 9

Cilia are rows of hairlike structures that move in unison to allow ciliates to move and acquire food

Question 10

What are the apicomplexa and what are their major properties?

Answer 10

Apicomplexa are non-motile obligate intracellular parasites that have complex life cycles
- usually infect multiple hosts
- have structures at tips that help it to penetrate host tissues