Problema 6 · Biología URV Test Practice: Eukaryotes and Fungi

a. Hydrogenosomes found in anaerobic protists are associated with which pathway?

Solución: b) Anaerobic fermentative ATP production

b. Which protist assemblage is defined by the presence of both flagella and a kinetoplast?

Solución: c) Kinetoplastids

c. What is the principal ecological niche of diatoms on Earth?

Solución: b) Major primary producers in global phytoplankton

d. Which parasitic group utilizes sporozoites as the vehicle for host transmission?

Solución: c) Apicomplexans

e. What role does the xanthophyll fucoxanthin fulfill in brown algae?

Solución: a) Broadens the photosynthetic absorption spectrum

f. How does the unicellular green alga Chlorella respond to environmental stress (e.g., nutrient limitation)?

Solución: b) Accumulates dense intracellular pools of neutral lipids or starch

g. What is the etiological agent of toxoplasmosis in mammals?

Solución: b) Toxoplasma gondii

h. Which parasitic protists absorb host nutrients directly across their outer membrane without a cytostome?

Solución: c) Apicomplexans

i. What biochemical hallmark links the green alga Chara closely to land plants?

Solución: c) Identical complement of photosynthetic pigments (chlorophyll a and b, carotenoids)

j. What mechanical phenomenon underlies the formation of pseudopodia?

Solución: a) Coordinated dynamic extensions of the actin cytoskeleton and cytoplasm