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Zoology 250 Midterm 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
Which of these features seems to be a synapomorphy of the cnidarian subphylum
Medusozoa?
a. two layers of epitheliomuscular cells
b. linear rather than circular mitochondrial DNA
c. presence of a siphonoglyph
d. loss of the polyp stage
e. presence of a complete gut - 🧠 ANSWER ✔✔b
Name a phylum of Metazoa that can reproduce sexually but does not have gonads.
- 🧠 ANSWER ✔✔Porifera
For which of these phyla was there a recent controversy about the presence of an
anal opening?
a. Xenacoelomorpha
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b. Ctenophora
c. Chaetognatha
d. Platyhelminthes
e. Nemertea - 🧠 ANSWER ✔✔b
Primary endosymbiosis involves a eukaryotic cell taking on a _____ as a symbiont
- 🧠 ANSWER ✔✔free-living bacteria
A triploblastic phylum that uses a toxin created by symbiotic bacteria. - 🧠
ANSWER ✔✔Chaetognatha
When unfertilized eggs are able to develop into a functional adult, this is called
____________ - 🧠 ANSWER ✔✔Parthenogenesis
If an anthozoan polyp has more than 8 tentacles, then a cross-section through it
should show _______ - 🧠 ANSWER ✔✔precisely 8 gastrovascular septa
Which of these protist taxa include species that live endosymbiotically in the guts
of termites and cockroaches? - 🧠 ANSWER ✔✔Parabasalida
Which of the following groups was placed into its current phylum based much
more on molecular evidence than on morphological evidence? - 🧠 ANSWER
✔✔Myxozoa
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COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
Zoology 250 Midterm 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
Which of these features seems to be a synapomorphy of the cnidarian subphylum
Medusozoa?
a. two layers of epitheliomuscular cells
b. linear rather than circular mitochondrial DNA
c. presence of a siphonoglyph
d. loss of the polyp stage
e. presence of a complete gut - 🧠 ANSWER ✔✔b
Name a phylum of Metazoa that can reproduce sexually but does not have gonads.
- 🧠 ANSWER ✔✔Porifera
For which of these phyla was there a recent controversy about the presence of an
anal opening?
a. Xenacoelomorpha
1
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, 2
b. Ctenophora
c. Chaetognatha
d. Platyhelminthes
e. Nemertea - 🧠 ANSWER ✔✔b
Primary endosymbiosis involves a eukaryotic cell taking on a _____ as a symbiont
- 🧠 ANSWER ✔✔free-living bacteria
A triploblastic phylum that uses a toxin created by symbiotic bacteria. - 🧠
ANSWER ✔✔Chaetognatha
When unfertilized eggs are able to develop into a functional adult, this is called
____________ - 🧠 ANSWER ✔✔Parthenogenesis
If an anthozoan polyp has more than 8 tentacles, then a cross-section through it
should show _______ - 🧠 ANSWER ✔✔precisely 8 gastrovascular septa
Which of these protist taxa include species that live endosymbiotically in the guts
of termites and cockroaches? - 🧠 ANSWER ✔✔Parabasalida
Which of the following groups was placed into its current phylum based much
more on molecular evidence than on morphological evidence? - 🧠 ANSWER
✔✔Myxozoa
2
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
