NURSING ANM AND GNM

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NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The enzyme amylase will affect the breakdown of carbohydrates, but it will not affect the breakdown of proteins. The ability of an enzyme molecule to interact with specific molecules is most directly determined by the
A
shapes of the molecules involved
B
number of molecules involved
C
sequence of bases present in ATP
D
amount of glucose present in the cell
Explanation: 

Detailed explanation-1: -Salivary amylase does not break down proteins because it does not have the required 3D shape to catalyze the breakdown of proteins. Every enzyme has a pretty specific substrate, and the substrate physically interacts with the enzyme during catalysis.

Detailed explanation-2: -Amylases digest starch into smaller molecules, ultimately yielding maltose, which in turn is cleaved into two glucose molecules by maltase. Starch comprises a significant portion of the typical human diet for most nationalities.

Detailed explanation-3: -Digestion of carbohydrates is performed by several enzymes. Starch and glycogen are broken down into glucose by amylase and maltase. Sucrose (table sugar) and lactose (milk sugar) are broken down by sucrase and lactase, respectively.

Detailed explanation-4: -Why can the same enzyme not break down cellulose? The enzyme cannot attack cellulose because of its helical shape. Cellulose molecules are much too large.

There is 1 question to complete.
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