cryptophytes

Question 1

primary or secondary endosymbiosis?

Answer 1

• Secondary endosymbiosis from red algae (4 membranes).

Question 2

structure

Answer 2

• Small, pear-shaped.
• Two unequal flagella (longer one with two rows of hairs(mastigonemes) shorter has single frow of mastigonemes) .
• Periplast: Flexible protein structure instead of cell wall.
• Trichocysts (ejectosomes): Defense mechanism — explosive protein discharge to escape predators.
• Rapid uncoiling propels the cell away from the predators in a zig zag ourse

Question 3

nutrition types

Answer 3

• Photoautotrophic: Chlorophyll a, c, phycobiliproteins (phycocyanin, phycoerythrin).
• Heterotrophic: No pigments, ingests particles.
• Mixotrophic: Both photosynthesis and ingestion.

Question 4

information about the choloroplast in cryptophytes

Answer 4

• Acquired vis secondary endosymbiosis from red algal ancestor
• Surrounded by 4 membranes (evidence of engulfed eukaryotic cell
• Contains phycoboloproteins (similar to red alage) for efficient light absorption

Question 5

main pigments?

Answer 5

chlorophyll a and c phycocyanin phycoerythrin

Question 6

storage products

Answer 6

starch in cytoplasm as lipid

Question 7

plastids

Answer 7

thylakoids usually in pairs. phycobilin pigments are located in the thylakoid lumen pyrenoid present

Question 8

habitat

Answer 8

planktonic

Question 9

representative genera

Answer 9

cryptomonas, chroomonas