Bio 172 UH Manoa Exam; Questions and Answers
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Endoderm
Mesoderm
Ectoderm Correct answer Three embryonic layers. Endoderm being the inner most layer
and Ectoderm being the outermost.
What traits are present in the early stages of development that would not allow you to
determine if the animal is a protostome or deuterostome?
A) Radial Cleavage
B) presence of endoderm, mesoderm, and ectoderm
c) Coelom formed by splitting the mesodermal mass
D) Anus forms from blastopore
E) The developmental fate of each embryonic cell is fully determined Correct answer B)
presence of endoderm, mesoderm, and ectoderm
Coelom Correct answer Internal body cavity derived from the mesoderm
Blastopore Correct answer The opening that develops into the mouth in protostomes and
the anus in deuterostomes
Radial Symmetry Correct answer Can be split on multiple planes and be symmetrical
(Circle)
Ex. Adult Cnidaria
Bilateral symmetry Correct answer Will only be symmetrical if split on one line, all others
will not be symmetrical (humans)
Ex. Nematoda
, Bio 172 UH Manoa Exam; Questions and Answers
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Rotational symmetry Correct answer Division of the body into two halves divides it into
two copies of the same half with one rotated 180 degrees.
Ex. Ctenophora
Asymmetry Correct answer No symmetry in any split
Ex. Porifera
Which is not a monophyletic group?
A) Opisthokonta
B) Bilateria
C) Cnidaria
D) Ctenophora
E) Porifera Correct answer A) Opisthokonta
Which is true about animal evolutionary history?
A) the Cambrian explosion led to the appearance of the Ediacaran biota
B) the Cambrian explosion occurred around 100 MYA
C) several extant phyla first appear in the fossil record from the Cambrian period
D) many fossils dating from the Cambrian explosion represent species that survive today
E) the Cambrian explosion was caused by a rapid increase in Earth's atmospheric nitrogen
Correct answer C) Several extant phyla first appear in the fossil record from the Cambrian
Period
, Bio 172 UH Manoa Exam; Questions and Answers
100% Solved
Ediacaran Period Correct answer before Cambrian period, about 635-543 MYA
Cambrian Explosion/Period Correct answer the most rapid evolution of new animal phyla
and animal diversity in Earth's history about 542-488 MYA
Which of the following is not typical of most animals?
A) Specialized tissues
B) a stage of development called gastrulation
C) possession of hox genes
D) alternation of generations between diploid and haploid lifestages
E) food obtained via heterotrophy Correct answer D) Alternation of generations between
diploid and haploid lifestages
Hox Genes Correct answer Responsible for the general body pattern of most animals
Gastrulation Correct answer results in the formation of the primitive gut (archenteron) or
digestive cavity and the formation of the embryonic layers.
Organogenesis Correct answer formation of organs
Which of the following is true of the animal phylogenetic tree?
A) fossils provide the best source of information for determining the animal phylogenetic tree
B) major accepted clades of the animal phylogeny have remained constant over the past 50
years
, Bio 172 UH Manoa Exam; Questions and Answers
100% Solved
C) Future DNA evidence is likely to demonstrate that the Bilateria is the most primitive animal
clade
D) Eumetazoans include more species than Metazoans
E) As more DNA is sequenced and analyzed from more animals, future changes to major
surviving clades of the animal phylogenetic tree become less likely. Correct answer E) As
more DNA is sequenced and analyzed from more animals, future changes to major surviving
clades of the animal phylogenetic tree become less likely
Which of the following is not true of the coelom?
A) it may be present in triploblastic organisms
B) it is a cavity the houses internal organs
C) it is derived from mesoderm
D) it is present in all animals
E) it usually contain fluids Correct answer D) it is present in all animals
Triploblastic Correct answer Having 3 embryonic layers (endoderm, mesoderm, and
ectoderm)
Diploblastic Correct answer Having 2 embryonic layers (endoderm and ectoderm).
Which of the following does not play a major role in Earth's post-Cambrian animal evolution?
A) evolution among plants
B) meteor strikes
C) Change in distance between the Earth and the sun
D) shift in Earth's geography
100% Solved
Endoderm
Mesoderm
Ectoderm Correct answer Three embryonic layers. Endoderm being the inner most layer
and Ectoderm being the outermost.
What traits are present in the early stages of development that would not allow you to
determine if the animal is a protostome or deuterostome?
A) Radial Cleavage
B) presence of endoderm, mesoderm, and ectoderm
c) Coelom formed by splitting the mesodermal mass
D) Anus forms from blastopore
E) The developmental fate of each embryonic cell is fully determined Correct answer B)
presence of endoderm, mesoderm, and ectoderm
Coelom Correct answer Internal body cavity derived from the mesoderm
Blastopore Correct answer The opening that develops into the mouth in protostomes and
the anus in deuterostomes
Radial Symmetry Correct answer Can be split on multiple planes and be symmetrical
(Circle)
Ex. Adult Cnidaria
Bilateral symmetry Correct answer Will only be symmetrical if split on one line, all others
will not be symmetrical (humans)
Ex. Nematoda
, Bio 172 UH Manoa Exam; Questions and Answers
100% Solved
Rotational symmetry Correct answer Division of the body into two halves divides it into
two copies of the same half with one rotated 180 degrees.
Ex. Ctenophora
Asymmetry Correct answer No symmetry in any split
Ex. Porifera
Which is not a monophyletic group?
A) Opisthokonta
B) Bilateria
C) Cnidaria
D) Ctenophora
E) Porifera Correct answer A) Opisthokonta
Which is true about animal evolutionary history?
A) the Cambrian explosion led to the appearance of the Ediacaran biota
B) the Cambrian explosion occurred around 100 MYA
C) several extant phyla first appear in the fossil record from the Cambrian period
D) many fossils dating from the Cambrian explosion represent species that survive today
E) the Cambrian explosion was caused by a rapid increase in Earth's atmospheric nitrogen
Correct answer C) Several extant phyla first appear in the fossil record from the Cambrian
Period
, Bio 172 UH Manoa Exam; Questions and Answers
100% Solved
Ediacaran Period Correct answer before Cambrian period, about 635-543 MYA
Cambrian Explosion/Period Correct answer the most rapid evolution of new animal phyla
and animal diversity in Earth's history about 542-488 MYA
Which of the following is not typical of most animals?
A) Specialized tissues
B) a stage of development called gastrulation
C) possession of hox genes
D) alternation of generations between diploid and haploid lifestages
E) food obtained via heterotrophy Correct answer D) Alternation of generations between
diploid and haploid lifestages
Hox Genes Correct answer Responsible for the general body pattern of most animals
Gastrulation Correct answer results in the formation of the primitive gut (archenteron) or
digestive cavity and the formation of the embryonic layers.
Organogenesis Correct answer formation of organs
Which of the following is true of the animal phylogenetic tree?
A) fossils provide the best source of information for determining the animal phylogenetic tree
B) major accepted clades of the animal phylogeny have remained constant over the past 50
years
, Bio 172 UH Manoa Exam; Questions and Answers
100% Solved
C) Future DNA evidence is likely to demonstrate that the Bilateria is the most primitive animal
clade
D) Eumetazoans include more species than Metazoans
E) As more DNA is sequenced and analyzed from more animals, future changes to major
surviving clades of the animal phylogenetic tree become less likely. Correct answer E) As
more DNA is sequenced and analyzed from more animals, future changes to major surviving
clades of the animal phylogenetic tree become less likely
Which of the following is not true of the coelom?
A) it may be present in triploblastic organisms
B) it is a cavity the houses internal organs
C) it is derived from mesoderm
D) it is present in all animals
E) it usually contain fluids Correct answer D) it is present in all animals
Triploblastic Correct answer Having 3 embryonic layers (endoderm, mesoderm, and
ectoderm)
Diploblastic Correct answer Having 2 embryonic layers (endoderm and ectoderm).
Which of the following does not play a major role in Earth's post-Cambrian animal evolution?
A) evolution among plants
B) meteor strikes
C) Change in distance between the Earth and the sun
D) shift in Earth's geography
