Algae

Which answer is correct?: Algae are...
1. ...prokaryotic autotrophic organisms
2. eukaryotic autotrophic organisms
3. prokaryotic heterotrophic organisms
Algae have
1. blue fyco-cyanin
2. red fyco-cyanin
3. blue fyco-erytrin
Storage substance by algae is
1. algetic starch
2. glycogen
3. cellulose
In shape different cells able to bind air nitrogen
1. heterocysts
2. acinetes
3. ascospores
Algae contain
1. circular DNA
2. right nucleus
3. linear DNA
The source of electrons for photosynthesis by algae
1. is the water
2. is not the water
Calm spores of algae are called
1. acinetes
2. heterocysts
3. ascospores
Algae occured
1. 2.5 to 3.5 millions years ago
2. 2.5 to 3.5 billions years ago
3. 3.5 to 5.5 millions years ago
Mushroom shaped formations developed through the sedimantation of calsium carbonate in the walls of algae are
1. stromatolites
2. baobalites
3. acinetes
Algae participate in the the production of rock
1. travertine
2. slate
3. limestone