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NEET 2013
Exam
NEET
Year
2013
Subject
Zoology
Chapter
Digestion and Absorption

NEET 2013 · Zoology · Digestion and Absorption

Which enzymes are likely to act on the baked potatoes eaten by a...

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?

Options

  1. APancreatic amylase →\rightarrow Salivary amylase →\rightarrow Lipases
  2. BDisaccharidase like maltase →\rightarrow Lipases →\rightarrow Nucleases
  3. CSalivary amylase →\rightarrow Pancreatic amylase →\rightarrow Disaccharidase
  4. DSalivary maltase →\rightarrow Carboxy peptidase →\rightarrow Trypsinogen

Correct answer

C. Salivary amylase →\rightarrow Pancreatic amylase →\rightarrow Disaccharidase

Step-by-step 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 α\alpha dextrin Starch ⟶ Salivary  amylase \underset{\text{ amylase }}{\stackrel{\text{ Salivary }}{\longrightarrow}} Maltose + Isomaltose +α+\alpha-Dextrins. Similarly, in small intestine, pancreatic amylase acts on starch to produce disaccharides maltose, isomaltose and α\alpha dextrin. Starch ⟶ Pancreatic α-anylase \underset{\alpha \text{-anylase }}{\stackrel{\text{ Pancreatic }}{\longrightarrow}} Maltose + Isomaltose +α+\alpha-Dextrins Then, these disacchararides are acted upon my intestinal juicesmaltase and convert it into monosaccharides. Maltose ⟶ Maltase \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
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