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?
- APancreatic amylase $\rightarrow$ Salivary amylase $\rightarrow$ Lipases
- BDisaccharidase like maltase $\rightarrow$ Lipases $\rightarrow$ Nucleases
- Correct answerCSalivary amylase $\rightarrow$ Pancreatic amylase $\rightarrow$ Disaccharidase
- DSalivary 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'.