Which of the following are triploblastic and acoelomate?
Correct answer: C. Platyhelminthes
- A. Sponges
- B. Annelida
- C. Platyhelminthes
- D. Aves
Explanation
Platyhelminthes are triploblastic because they develop from three germ layers, and acoelomate because they lack a fluid-filled body cavity between the gut and body wall. Sponges do not have true germ layers, while annelids and birds are coelomate animals. Students may choose b by remembering that annelids are triploblastic but overlooking that they possess a true coelom.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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