Question

19. (v) The diagram represents stages in the breakdown of starch to maltose by the enzyme amylase.
Which are the correct labels ?
Starch
a.P
b.Q
c.R
d.R
Maltose
a.R
b.R
c.P
d.Q
Amylase
a.Q
b.P
c.Q
d.P​

Answer 1

Answer:

P is amylase

Q is starch

S is maltose

Answer 2

In the diagram the correct labelling is Q,R and P. (Option b)

• Since we observe Starch breaking down and diagrammatically Q is being broken down, Q represents starch.
• R is broken part of Q hence, we can tell that R is maltose as breakdown of starch gives rise to maltose.
• And hence P represents the enzyme amylase.
• Amylases break down starch into smaller molecules, producing maltose, which is then split into two glucose molecules by the enzyme maltase.
• For most countries, a sizable component of the usual human diet is made up of starch.
• Amylose and amylopectin are broken down by salivary amylase into dextrins and maltose, which are shorter chains of glucose.
• Whole grains are sweetened by the increased concentration of maltose in the mouth that comes from the mechanical and chemical breakdown of their starches.
• A sample of starch will hydrolyze into dextrins, maltose, glucose, and shorter polysaccharides in the presence of amylase.
• Depending on how long the reaction is allowed to run, the amount of hydrolysis will vary; if the starch is entirely hydrolyzed, glucose will be the final product.

Hence, in the diagram the correct labelling is Q,R and P.

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