TAMU BIOLOGY 112 PRACTICE EXAMS 2025/2026
QUESTIONS WITH ANSWERS RATED A+
✔✔choanocytes - ✔✔-create currents, trap and ingest food bits through phagocytosis
✔✔amoebocytes - ✔✔distribute food
✔✔cnidaria - ✔✔-radial symmetry
-polyp-sessile
-medusa form free-floating
-sac like body with gastrovascular cavity
-stinging tentacles around central mouth catch prey with cnidocytes
✔✔ctenophora - ✔✔-comb jellies are biradially symmetric and diploblastic
-transparent, medusa like body
-moves with cilia, fused into 8 comb like plates
-largest organism to move with cilia
-only 2 tentacles or none
-cells eject sticky thread to capture prey
✔✔plathelminthes - ✔✔-flatworms
-flat, triploblastic, coelomate with bilateral symmetry
-mesoderm derived muscle tissues
-many organs, simple nervous system
-protonephridia with flame bulbs remove excess water and waste
✔✔flatworm diversity - ✔✔planarians, trematodes, tapeworms
✔✔planarians - ✔✔free living carnivores or scavengers
✔✔trematodes - ✔✔parasitic on animals and with complex life cycles
✔✔tapeworms - ✔✔-parasitic mostly in vertebrate intestines
-no mouth or digestive system (absorptive feeders)
-anterior scolex for attachment
-repeated productive segments fill with eggs
✔✔rotifers - ✔✔-free living, aquatic
-microscopic, cylindrical body
-rotating wheel of cilia brings plankton to mouth
-well developed organ systems
-alimentary canal
-pseudocoelom acts as circulatory system
-parthenogenesis sometimes occurs
, ✔✔ectoprocta - ✔✔-true coelom
-bryozoans or moss animals
-most with mineralized exoskeleton
-colonial, mostly marine
✔✔brachiopoda - ✔✔-have left and right
-marine with 2 shells (analogous to bivalve mollusks) and pedicle
-very diverse in fossil record, few species today
✔✔mollusca - ✔✔-muscular feet
-visceral mass
-brain goes around digestive tract
-most have open circulatory system
-mantle covers visceral mass
-forms mantle cavity with gills or lungs
-shell present in most mollusks
-secreted by mantle tissue
-CaCO3 in a protein matrix
-many feed with radula
-most with separate sexes
✔✔gastropoda - ✔✔-falls under mollusca
-stomach foot
-cephalization
-largest class: land, freshwater, marine
-single shell or no shell
-viscera twists so that mantle cavity lies over end of head
-feed with radula
✔✔class bivalvia - ✔✔bivalves, 2 part shell joined by hinge
no distinct head
-burrowing or sessile
✔✔bivalves - ✔✔oyesters and others, exception of Mollusca that DO NOT feed with
radula
✔✔cephalopoda - ✔✔-falls under mollusca
-head foot
-mostly active marine predators
-foot modified into grasping arms and tentacles with suckers
-octopus, squid, cuttle fish
-beak like jaws
-well developed eyes and brain
-water jet propulsion
-protective ink
QUESTIONS WITH ANSWERS RATED A+
✔✔choanocytes - ✔✔-create currents, trap and ingest food bits through phagocytosis
✔✔amoebocytes - ✔✔distribute food
✔✔cnidaria - ✔✔-radial symmetry
-polyp-sessile
-medusa form free-floating
-sac like body with gastrovascular cavity
-stinging tentacles around central mouth catch prey with cnidocytes
✔✔ctenophora - ✔✔-comb jellies are biradially symmetric and diploblastic
-transparent, medusa like body
-moves with cilia, fused into 8 comb like plates
-largest organism to move with cilia
-only 2 tentacles or none
-cells eject sticky thread to capture prey
✔✔plathelminthes - ✔✔-flatworms
-flat, triploblastic, coelomate with bilateral symmetry
-mesoderm derived muscle tissues
-many organs, simple nervous system
-protonephridia with flame bulbs remove excess water and waste
✔✔flatworm diversity - ✔✔planarians, trematodes, tapeworms
✔✔planarians - ✔✔free living carnivores or scavengers
✔✔trematodes - ✔✔parasitic on animals and with complex life cycles
✔✔tapeworms - ✔✔-parasitic mostly in vertebrate intestines
-no mouth or digestive system (absorptive feeders)
-anterior scolex for attachment
-repeated productive segments fill with eggs
✔✔rotifers - ✔✔-free living, aquatic
-microscopic, cylindrical body
-rotating wheel of cilia brings plankton to mouth
-well developed organ systems
-alimentary canal
-pseudocoelom acts as circulatory system
-parthenogenesis sometimes occurs
, ✔✔ectoprocta - ✔✔-true coelom
-bryozoans or moss animals
-most with mineralized exoskeleton
-colonial, mostly marine
✔✔brachiopoda - ✔✔-have left and right
-marine with 2 shells (analogous to bivalve mollusks) and pedicle
-very diverse in fossil record, few species today
✔✔mollusca - ✔✔-muscular feet
-visceral mass
-brain goes around digestive tract
-most have open circulatory system
-mantle covers visceral mass
-forms mantle cavity with gills or lungs
-shell present in most mollusks
-secreted by mantle tissue
-CaCO3 in a protein matrix
-many feed with radula
-most with separate sexes
✔✔gastropoda - ✔✔-falls under mollusca
-stomach foot
-cephalization
-largest class: land, freshwater, marine
-single shell or no shell
-viscera twists so that mantle cavity lies over end of head
-feed with radula
✔✔class bivalvia - ✔✔bivalves, 2 part shell joined by hinge
no distinct head
-burrowing or sessile
✔✔bivalves - ✔✔oyesters and others, exception of Mollusca that DO NOT feed with
radula
✔✔cephalopoda - ✔✔-falls under mollusca
-head foot
-mostly active marine predators
-foot modified into grasping arms and tentacles with suckers
-octopus, squid, cuttle fish
-beak like jaws
-well developed eyes and brain
-water jet propulsion
-protective ink
