Topic 6 Questions: Cryptomonads Flashcards
How do cryptomonads move and what is their primary habitat?
They can move via their 2 flagella or move via currents
Their primary habitat is deep cold waters
Prefer 20-22 degrees
Describe the major features of a cryptomonad cell.
Ejectisomes
Nucleus
Contractile vacuole
flagella
- What cellular features are responsible for the poor preservation of cryptomonad cells and why?
Ejectisomes: they are rapidly discharged into the vestibulum as a defense response
This makes them disintegrate
- What material are the periplast plates made of? Where is the periplast located
numerous hexagonal, rectangular protein plates beneath and above plasma membrane
- What is the nucleomorph and what is its origin?
This is a remnant of the endosymbiont nucleus and it is derived from red algae
- Name two accessory pigments present in crytomonad cells.
phycocyanin and phycoerythrin
- What is the primary mode of reproduction in this algal group?
asexual mitosis and cytokinesis
production of resting stages or cysts
- Compare and contrast euglenoids with cryptomonads.
COMMON:
Freshwater and marine
Require vitamin B
Phagotrophic forms
Flagella emerge from apical depression
Primarily unicells
Most naked, with cell covering inside the plasma
membrane
Plastidless, colorless plastids or pigmented plastids
Plastids: by secondary endosymbiosis
Storage: granules in the cytoplasm
Have light sensitive systems
Can produce cysts
No good fossil record.
DIFFERENT:
CRYPTOMONADS
No metabolic movements
* Storage material: starch
* Different flagellar apparatus
Pigments resemble those of red algae
Commonly planktonic.