Which chemical component has the greatest contribution in the total mammalian cell weight__________?
Correct answer: D. Water
- A. Proteins
- B. Carbohydrate
- C. Lipids
- D. Water
Explanation
Water usually makes up the greatest proportion of a mammalian cell's mass, commonly about 70% or more, and acts as the main solvent for cellular reactions. Proteins, lipids and carbohydrates together generally contribute less total mass than water. Students often choose proteins because they are the most abundant organic macromolecules, but the question asks for the total cell weight, not only dry organic matter.
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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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