This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: nutrition and digestion, Subject name: Biochemistry
Alpha-amylase acts on which bond? 
Select and explain. 
A. Alpha 1-4 bond, B. Alpha 1-6, C. Beta 1-4, D. Beta 1-6
A: Alpha 1-4 bond
Answer: A: Alpha 1-4 bond 
Explanation: Salivary amylase and pancreatic amylase are alpha-amylases, which act at random on alpha- 1,4 glycosidic bonds to split starch into smaller units (dextrins), and finally to alpha-maltose.Ref: DM Vasudevan, page no: 69