Which of the following do NOT need to be digested into smaller forms before the GI tract can absorb them?

Question

BlackTom AI · Accepted Answer

Question restatement: Which of the following do NOT need to be digested into smaller forms before the GI tract can absorb them?

Answer options: 
- Proteins and polysaccharides 
- Polysaccharides and vitamins 
- Vitamins and minerals 
- Proteins and minerals 
- Proteins and vitamins 
- Polysaccharides and minerals

Analysis of each option: 
Option 1: 'Proteins and polysaccharides' — Both proteins and polysaccharides require breaking down before absorption. Proteins are digested into amino acids, and polysaccharides are digested into monosaccharides like glucose. This option states a combination that does need digestion, so it is incorrect with respect to the question.

Option 2: 'Polysaccharides and vitamins' — Polysaccharides must be hydrolyzed to monosaccharides prior to absorption, so digestion is required for them. Vitamins, however, generally do not require digestion to be absorbed; many vitamins are absorbed intact or in their active forms. Since one part of this pair does require digestion, this option is not the correct answer to the prompt.

Option 3: 'Vitamins and minerals' — This pair comprises micronutrients that are typically absorbed without prior digestion: vitamins (especially water-soluble vitamins) are absorbed through intestinal cells largely in their active or readily absorbable forms, and minerals are absorbed as ions or simple compounds without being digested into smaller units. This aligns with the statement that they do NOT need to be digested first. This option correctly answers the question.

Option 4: 'Proteins and minerals' — Proteins require digestion to amino acids before absorption, whereas minerals do not. Since one component (proteins) does require digestion, this option does not fit the prompt.

Option 5: 'Proteins and vitamins' — Proteins require digestion; vitamins generally do not. Because digestion is needed for proteins, this option is not correct for the question.

Option 6: 'Polysaccharides and minerals' — Polysaccharides require breakdown to monosaccharides, while minerals do not. The presence of polysaccharides that must be digested means this option is not the correct answer.

Synthesis: Only 'Vitamins and minerals' describes substances that typically do not require digestion into smaller units before absorption, whereas all other pairings include at least one component that must be digested (proteins, polysaccharides). Therefore, option 3 is the correct choice, corresponding to the given answer.

Which of the following do NOT need to be digested into smaller forms before the GI tract can absorb them?单项选择题

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