The following is a scheme showing the fate of carbohydrates during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as A, B, C and D. Choose the correct option from those given.

A - Amylase, B - Maltase, C - Lactase, D - Invertase

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A - Amylase, B - Maltase, C - Invertase, D - Lactase

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A - Amylase, B - Invertase, C - Maltase, D - Lactase

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A - Amylase, B - Lactase, C - Maltase, D - Invertase

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Solution

The correct option is D A - Amylase, B - Lactase, C - Maltase, D - Invertase
$S t a r c h A m y l a s e - ---- \to M a l t o s e + I s o m a l t o s e + L i m i t d e x t r i n s$

$L a c t o s e M i l k s u g a r L a c t a s e - --------- \to β - g a l a c t o s i d a s e G l u c o s e + G a l a c t o s e$

$M a l t o s e M a l t a s e - -------- \to α - g l u c o s i d a s e G l u c o s e + G l u c o s e$

$S u c r o s e C a n e s u g a r S u c r a s e / i n v e r t a s e - ---------- \to β - f r u c t o s i d a s e G l u c o s e + F r u c t o s e$

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\begin{matrix} Column I (Enzyme) & Column II (Substrate) i. Amylase & a. Maltose. ii. Maltase & b.Saccharides. iii.Sucrase & c.Dextrins. iv. α Dextrinase & d.Sucrose. \end{matrix}

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