Q146 / 180 · NEET 2013 (Karnataka) · Zoology

Which enzymes are likely to act on the baked potatoes eaten by a man, starting from the mouth and as it moves down the alimentary canal?

  • A
    Pancreatic amylase $\rightarrow$ Salivary amylase $\rightarrow$ Lipases
  • B
    Disaccharidase like maltase $\rightarrow$ Lipases $\rightarrow$ Nucleases
  • Correct answer
    C
    Salivary amylase $\rightarrow$ Pancreatic amylase $\rightarrow$ Disaccharidase
  • D
    Salivary maltase $\rightarrow$ Carboxy peptidase $\rightarrow$ Trypsinogen

Solution

Baked potatoes consists of starch, which is a polysaccharide. Hence, it is acted upon by salivary amylase in mouth which converts starch into maltose, isomaltose and $\alpha$ dextrin Starch $\underset{\text { amylase }}{\stackrel{\text { Salivary }}{\longrightarrow}}$ Maltose + Isomaltose $+\alpha$-Dextrins. Similarly, in small intestine, pancreatic amylase acts on starch to produce disaccharides maltose, isomaltose and $\alpha$ dextrin. Starch $\underset{\alpha \text {-anylase }}{\stackrel{\text { Pancreatic }}{\longrightarrow}}$ Maltose + Isomaltose $+\alpha$-Dextrins Then, these disacchararides are acted upon my intestinal juicesmaltase and convert it into monosaccharides. Maltose $\stackrel{\text { Maltase }}{\longrightarrow}$ Glucose + Glucose Related Theory The breakdown of biomacromolecules occurs in the duodenum region of the small intestine. The simple substances thus formed are absorbed in the jejunum and ileum regions of the small intestine. The undigested and unabsorbed substances are passed on to the large intestine. Caution Gastric amylase appears to play a minor role in starch digestion in the stomach

Hence, the correct answer is option: 'C'.

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