Question
Which of the following are characteristics of the Ecdysozoans. Select all that apply. Partial credit will be awarded.
Question 2 options:
bilateral symmetry
molting
complete digestive tract
triploblastic
blastopore becomes the anus
acoelomates
protostome development
Question 2 options:
bilateral symmetry
molting
complete digestive tract
triploblastic
blastopore becomes the anus
acoelomates
protostome development
Answers
Answered by
GPT-4o mini
The characteristics of the Ecdysozoans include:
1. **Bilateral symmetry** - Correct. Most Ecdysozoans exhibit bilateral symmetry.
2. **Molting** - Correct. A defining feature of Ecdysozoans is that they undergo a process called ecdysis, or molting, where they shed their exoskeleton.
3. **Complete digestive tract** - Correct, but it's worth noting that not all Ecdysozoans have a complete digestive tract; many do, especially those in the larger clades.
4. **Triploblastic** - Correct. Ecdysozoans are triploblastic, meaning they develop from three germ layers: ectoderm, mesoderm, and endoderm.
5. **Blastopore becomes the anus** - Correct. Ecdysozoans are considered protostomes, but in some contexts, especially when looking more broadly at development types, they can also be discussed in relation to deuterostome characteristics. Generally, in protostomes (to which Ecdysozoans belong), the blastopore does become the mouth, whereas in deuterostomes, it becomes the anus.
6. **Acoelomates** - Incorrect. Ecdysozoans can be coelomates or pseudocoelomates; they are not typically considered acoelomates.
7. **Protostome development** - Correct. Ecdysozoans are protostomes, which means that during their embryonic development, the mouth forms before the anus.
So, the correct answers would be:
- Bilateral symmetry
- Molting
- Complete digestive tract
- Triploblastic
- Protostome development
The statement about the blastopore is conditional, as it generally concerns protostome development. However, since Ecdysozoans are specifically protostomes, you might want to consider including it depending on the context of your course or examination.
1. **Bilateral symmetry** - Correct. Most Ecdysozoans exhibit bilateral symmetry.
2. **Molting** - Correct. A defining feature of Ecdysozoans is that they undergo a process called ecdysis, or molting, where they shed their exoskeleton.
3. **Complete digestive tract** - Correct, but it's worth noting that not all Ecdysozoans have a complete digestive tract; many do, especially those in the larger clades.
4. **Triploblastic** - Correct. Ecdysozoans are triploblastic, meaning they develop from three germ layers: ectoderm, mesoderm, and endoderm.
5. **Blastopore becomes the anus** - Correct. Ecdysozoans are considered protostomes, but in some contexts, especially when looking more broadly at development types, they can also be discussed in relation to deuterostome characteristics. Generally, in protostomes (to which Ecdysozoans belong), the blastopore does become the mouth, whereas in deuterostomes, it becomes the anus.
6. **Acoelomates** - Incorrect. Ecdysozoans can be coelomates or pseudocoelomates; they are not typically considered acoelomates.
7. **Protostome development** - Correct. Ecdysozoans are protostomes, which means that during their embryonic development, the mouth forms before the anus.
So, the correct answers would be:
- Bilateral symmetry
- Molting
- Complete digestive tract
- Triploblastic
- Protostome development
The statement about the blastopore is conditional, as it generally concerns protostome development. However, since Ecdysozoans are specifically protostomes, you might want to consider including it depending on the context of your course or examination.