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Zoology 250 Midterm 1: Metazoa and
placozoa, porifera 2025/2026 Exam
Questions with 100% Correct Answers |
Latest Update
What character states define Kingdom Anamalia? - 🧠 ANSWER ✔✔1) animals are
multicellular (except gametes)
-hence alternative name of Metazoa
-to distinguish from single-celled protozoans, protozoa being an old name for non-
photosynthetic single celled eukaryotes
2) lack cell wall
-unlike other major groups of multicellular eukaryotes, plants and fungi
3) are chemoheterotrophic: cannot make own carbon-based food source, get it from
carbon molecules made by other organisms
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,2
4) are (mostly) sexual: motile haploid sperm fertilizes larger non-motile haploid
egg to make diploid zygote
5) are animate: are capable of moving entire multicellular body in at least one stage
in life cycle
meta - 🧠 ANSWER ✔✔later
Meta also means change which is a little bit confusing
zoo - 🧠 ANSWER ✔✔animal
prot - 🧠 ANSWER ✔✔early, first
A few features are unique to animals and may act as synapomorphies for the
entirety of the kingdom or for large clades within it - 🧠 ANSWER ✔✔1)
gastrulation and embryonic tissue layering
2) unique types of intercellular junctions
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, 3
3)Type IV collagen
4)Type IV collagen is a main constituent of the basal lamina, the epithelium-
secreted layer of the basement membrane
5) striated myofibrils and actin-myosin contractile elements
definition of animal - 🧠 ANSWER ✔✔a heterotrophic multicellular eukaryote that
undergoes embryogenesis via tissue layering
1) gastrulation and embryonic tissue layering - 🧠 ANSWER ✔✔most animals share
similar pattern of fertilization and early embryonic development
have haploid gametes of different sizes
-anisogamy: small motile sperm, large nonmotile eggs
Diploid zygote initially undergoes a number of mitatic cell divisions without
growth of cells between divisions
3
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
Zoology 250 Midterm 1: Metazoa and
placozoa, porifera 2025/2026 Exam
Questions with 100% Correct Answers |
Latest Update
What character states define Kingdom Anamalia? - 🧠 ANSWER ✔✔1) animals are
multicellular (except gametes)
-hence alternative name of Metazoa
-to distinguish from single-celled protozoans, protozoa being an old name for non-
photosynthetic single celled eukaryotes
2) lack cell wall
-unlike other major groups of multicellular eukaryotes, plants and fungi
3) are chemoheterotrophic: cannot make own carbon-based food source, get it from
carbon molecules made by other organisms
1
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
,2
4) are (mostly) sexual: motile haploid sperm fertilizes larger non-motile haploid
egg to make diploid zygote
5) are animate: are capable of moving entire multicellular body in at least one stage
in life cycle
meta - 🧠 ANSWER ✔✔later
Meta also means change which is a little bit confusing
zoo - 🧠 ANSWER ✔✔animal
prot - 🧠 ANSWER ✔✔early, first
A few features are unique to animals and may act as synapomorphies for the
entirety of the kingdom or for large clades within it - 🧠 ANSWER ✔✔1)
gastrulation and embryonic tissue layering
2) unique types of intercellular junctions
2
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, 3
3)Type IV collagen
4)Type IV collagen is a main constituent of the basal lamina, the epithelium-
secreted layer of the basement membrane
5) striated myofibrils and actin-myosin contractile elements
definition of animal - 🧠 ANSWER ✔✔a heterotrophic multicellular eukaryote that
undergoes embryogenesis via tissue layering
1) gastrulation and embryonic tissue layering - 🧠 ANSWER ✔✔most animals share
similar pattern of fertilization and early embryonic development
have haploid gametes of different sizes
-anisogamy: small motile sperm, large nonmotile eggs
Diploid zygote initially undergoes a number of mitatic cell divisions without
growth of cells between divisions
3
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
