Algae

Question 1

General

Answer 1

Can be unicellular or multicellular
Responsible for oxygen production
Can undergo sexual or asexual reproduction
Some produce toxins:
-Dinoflagellates - saxitorin(neurodamage) (paralysis)
→ diatoms - domoic acid (short term memory less

Question 2

Pathogenic algae

Answer 2

Genus prototheca includes achlorophyllous green algae
Causes protothecosis (skin disease)

Question 3

Heterotrophic algae

Answer 3

• Shared ancestry
• loss of photosynthetic ability
Presence of cell wall
• biochemical pathways

Question 4

Algal chloroplasts

Answer 4

Pyrenoids - sub compartment improving photosynthesis

Question 5

Archaeplastida

Answer 5

Chloroplast from primary endosymbiosis
1)chlorophyta - usual green algae
2) chlamydomonas - unicellular, flagellate, eight sensing spot
3) rhodophyta -red algae oldest group
4) charophyta - green algae and land plants
Volvox -unicellular form colonies
Ulva-multicellular edible algae

Question 6

Chromalveolates _dinoflagellates

Answer 6

Marine
Can be phototrophs, heterotrophs
Some make neurotoxins
Thick cellulose armour-theca

Question 7

Chromalveolates _stramenopiles

Answer 7

1) chrysophyta - golden algae, fucoxanthin pigment
2) phaeophyta - brown algae multicellular; chlorophyll a,c, beta-carotene and fucoxanthin
3) bacillariophyta - diatoms, silica skeletons-frustules