Problema 2 · Biología URV Test Practice: Eukaryotes and Fungi

a. Which notable biological feature is characteristic of dinoflagellates?

Solución: c) Biosynthesis of potent neurotoxins

b. What defines an apicoplast?

Solución: b) A non-photosynthetic relict plastid derived from an algal endosymbiont

c. Which secondary pigment imparts the distinctive brownish coloration to Phaeophyceae (brown algae)?

Solución: b) Fucoxanthin

d. Which taxon of unicellular green algae is widely cultivated for commercial biofuel synthesis?

Solución: c) Chlorella

e. What structural material constitutes the cell wall (frustule) of diatoms?

Solución: a) Amorphous hydrated silica

f. Which medical condition is initiated by Trichomonas vaginalis?

Solución: b) Trichomoniasis (sexually transmitted infection)

g. Which physiological and genomic trait is recognized in parabasalids?

Solución: c) Paucity or absence of canonical spliceosomal introns

h. What vital biological stage is carried out by sporozoites in Apicomplexa?

Solución: c) Infection and transmission into a novel host organism

i. What aquatic environment harbors the overwhelming majority of chlorophyte species?

Solución: c) Freshwater habitats

j. What cytological feature uniquely distinguishes diplomonads?

Solución: b) Possession of two identical nuclei