Amphoixus is a__________?
Correct answer: D. All of these
- A. Chordate
- B. Protochordate
- C. Lower chordate
- D. All of these
Explanation
Amphioxus, or Branchiostoma, has chordate features such as a notochord, dorsal hollow nerve cord and pharyngeal slits. It is therefore a protochordate and is commonly called a lower chordate, making all three descriptions applicable. Students may choose b or c by selecting only one classification level instead of recognizing that the terms overlap.
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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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