EXAM 3 BIOL 211 IOWA STATE –
BIEDERMAN EXAM QUESTIONS &
ACTUAL CORRECT ANSWERS
Deuterostomes are - correct answer ✔✔• bilaterally symmetrical
• Coelomate
• Blastopore fate (anus)
Blastopore Fate (anus) - correct answer ✔✔• Second opening in the gastrula becomes the
mouth
Phylum Echinodermata classes - correct answer ✔✔• Sea stars
• Brittle stars
• Sea urchins
• Sand dollars
• Sea cucumbers
How many species of phylum Echinodermata are there? - correct answer ✔✔7,500 species (all
marine)
Adult Echinoderms - correct answer ✔✔Pentaradial (Starfish)
Cnidarians - correct answer ✔✔Radial symmetry (jellyfish)
Echinoderms have what kind of system - correct answer ✔✔Unique water vascular system
,True or false: Deuterostomes are chordates? - correct answer ✔✔False
Echinoderms have a network of hydraulic canals used in - correct answer ✔✔• locomotion
• feeding
• gas exchange
• excretion
Echinoderm Features - correct answer ✔✔• Muscle and nervous tissue, but no cephalization in
adults
• No specialized respiratory, circulatory, or excretory systems
• Complete (but short) digestive system
Sea Stars - correct answer ✔✔keystone predators/ species - play a unique role in the ay
ecosystems function
Phylum Chordata - correct answer ✔✔This phylum includes the animals that are most familiar
to us - and includes humans
Phylum Chordata subphylum - correct answer ✔✔•Cephalochordate
• Urochordata
• Vertebraes
All chordates have four characteristics - correct answer ✔✔• Pharyngeal gills slits or pouches
• dorsal hollow nerve cord
• notochord
• post-anal tail
, Pharyngeal slits or pouches - correct answer ✔✔Openings to the outside of the body at the
pharynx
Pharyngeal slits allow what - correct answer ✔✔Allows water that enters the mouth to exit
without passing though the gut in invertebrate chordates
Dorsal hollow nerve cord - correct answer ✔✔Nerve cord develops into the central nervous
system (brain and spinal cord)
Notochord - correct answer ✔✔A flexible rod that supports a chordate's back
Muscular post-anal tail - correct answer ✔✔• tail that extends posteriorly to anus
• lost during embryonic development in may species
Subphylum Cephalochordate - correct answer ✔✔lancelets (blade like shape)
Lancelet anatomy - correct answer ✔✔Suspension feeders that use their pharyngeal slits to
filter out small food particles
Subphylum Urochordata - correct answer ✔✔tunicates, sea squirts
Adult tunicate features - correct answer ✔✔• no notochord
• no dorsal hollow nerve cord
• no post anal tail
Subphylum Vertebrates - correct answer ✔✔63,000 named species of vertebraes
BIEDERMAN EXAM QUESTIONS &
ACTUAL CORRECT ANSWERS
Deuterostomes are - correct answer ✔✔• bilaterally symmetrical
• Coelomate
• Blastopore fate (anus)
Blastopore Fate (anus) - correct answer ✔✔• Second opening in the gastrula becomes the
mouth
Phylum Echinodermata classes - correct answer ✔✔• Sea stars
• Brittle stars
• Sea urchins
• Sand dollars
• Sea cucumbers
How many species of phylum Echinodermata are there? - correct answer ✔✔7,500 species (all
marine)
Adult Echinoderms - correct answer ✔✔Pentaradial (Starfish)
Cnidarians - correct answer ✔✔Radial symmetry (jellyfish)
Echinoderms have what kind of system - correct answer ✔✔Unique water vascular system
,True or false: Deuterostomes are chordates? - correct answer ✔✔False
Echinoderms have a network of hydraulic canals used in - correct answer ✔✔• locomotion
• feeding
• gas exchange
• excretion
Echinoderm Features - correct answer ✔✔• Muscle and nervous tissue, but no cephalization in
adults
• No specialized respiratory, circulatory, or excretory systems
• Complete (but short) digestive system
Sea Stars - correct answer ✔✔keystone predators/ species - play a unique role in the ay
ecosystems function
Phylum Chordata - correct answer ✔✔This phylum includes the animals that are most familiar
to us - and includes humans
Phylum Chordata subphylum - correct answer ✔✔•Cephalochordate
• Urochordata
• Vertebraes
All chordates have four characteristics - correct answer ✔✔• Pharyngeal gills slits or pouches
• dorsal hollow nerve cord
• notochord
• post-anal tail
, Pharyngeal slits or pouches - correct answer ✔✔Openings to the outside of the body at the
pharynx
Pharyngeal slits allow what - correct answer ✔✔Allows water that enters the mouth to exit
without passing though the gut in invertebrate chordates
Dorsal hollow nerve cord - correct answer ✔✔Nerve cord develops into the central nervous
system (brain and spinal cord)
Notochord - correct answer ✔✔A flexible rod that supports a chordate's back
Muscular post-anal tail - correct answer ✔✔• tail that extends posteriorly to anus
• lost during embryonic development in may species
Subphylum Cephalochordate - correct answer ✔✔lancelets (blade like shape)
Lancelet anatomy - correct answer ✔✔Suspension feeders that use their pharyngeal slits to
filter out small food particles
Subphylum Urochordata - correct answer ✔✔tunicates, sea squirts
Adult tunicate features - correct answer ✔✔• no notochord
• no dorsal hollow nerve cord
• no post anal tail
Subphylum Vertebrates - correct answer ✔✔63,000 named species of vertebraes
