Topic 6 Questions: Cryptomonads Flashcards

1
Q

How do cryptomonads move and what is their primary habitat?

A

They can move via their 2 flagella or move via currents

Their primary habitat is deep cold waters
Prefer 20-22 degrees

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2
Q

Describe the major features of a cryptomonad cell.

A

Ejectisomes
Nucleus
Contractile vacuole
flagella

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3
Q
  • What cellular features are responsible for the poor preservation of cryptomonad cells and why?
A

Ejectisomes: they are rapidly discharged into the vestibulum as a defense response
This makes them disintegrate

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4
Q
  • What material are the periplast plates made of? Where is the periplast located
A

numerous hexagonal, rectangular protein plates beneath and above plasma membrane

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5
Q
  • What is the nucleomorph and what is its origin?
A

This is a remnant of the endosymbiont nucleus and it is derived from red algae

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6
Q
  • Name two accessory pigments present in crytomonad cells.
A

phycocyanin and phycoerythrin

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7
Q
  • What is the primary mode of reproduction in this algal group?
A

asexual mitosis and cytokinesis
production of resting stages or cysts

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8
Q
  • Compare and contrast euglenoids with cryptomonads.
A

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.

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