Question

what molecules can be broken down into intermediate products that enter cellular respiration? check all that apply proteins lipids nucleic acids carbon dioxide

Explanation:

• Proteins: Proteins are broken down into amino acids, which can be converted into intermediates of glycolysis or the citric acid cycle to enter cellular respiration.
• Lipids: Lipids (fats) are broken down into glycerol and fatty acids. Glycerol can be converted to glyceraldehyde - 3 - phosphate (a glycolysis intermediate), and fatty acids are broken down via beta - oxidation to acetyl - CoA (a citric acid cycle intermediate).
• Nucleic acids: Nucleic acids are broken down into nucleotides, which can be further broken down into components that can enter cellular respiration pathways (e.g., the sugar part can be metabolized like other sugars, and the nitrogenous bases can be metabolized to enter energy - producing pathways).
• Carbon dioxide: Carbon dioxide is a product of cellular respiration, not a molecule that is broken down to enter cellular respiration. It is released during the citric acid cycle and is the end - product of the oxidation of organic molecules in respiration.

Answer:

A. proteins, B. lipids, C. nucleic acids