Action of Salivary Amylase on Starch

What is the meant by optimum temperature for enzyme activity?

• The temperature at which the enzyme deactivated.

• The temperature at which the enzyme denaturated.

• The temperature at which the enzyme shows the maximum activity.

• The temperature at which the enzyme shows the minimum activity.

The digestion of food starts at the ______.

• Alimentary Canal

• Intestine

• Stomach

• Mouth

The optimum temperature for the enzymatic activity of salivary amylase ranges from ______ to ______.

• 32 °C to 37 °C.

• 5 °C to 10 °C.

• -10 °C to 10 °C.

• 30 °C to 32 °C.

The enzyme salivary amylase is most active at pH ______.

• 6.8

• 5.4

• 2.5

• 10

Which of the following digestive enzyme is found in the saliva?

• Mucin

• secretin

• Salivary amylase

• Pepsin

The salivary amylase hydrolyses starch into __________.

• Lipids

• Carbohydrate.

• Maltose

• Fats

What is an achromic point?

• The point at which the enzyme shows the maximum activity.

• The point at which the enzyme denaturated.

• Time during the action of amylase on starch at which the reaction mixture no longer gives a colour with iodine.

• The time required to digest starch partially by the enzyme-salivary amylase.

In the stomach the salivary amylase is not functioning. Why?

• Stomach is highly acidic.

• pH of stomach is more than 6.

• Digestion of starch is not happening in stomach.

• Stomach is highly basic.

The experiment set up to study the effect of temperature on the activity of salivary amylase on starch is carried out at 10 °C. The solution mixture that contains amylase and starch keeps on giving blue colour for iodine test about half an hour. What is the reason for this?

• At the lower temperature, reaction rate of starch reduces.

• At the lower temperature, starch loss its functionality.

• At the lower temperature, the enzyme is more activated.

• At the lower temperature, the enzyme is deactivated.

What is a valid conclusion based on the graph?

• Temperature influences an enzyme's activity rate.
• The maximum rate of human respiration occurs at about 57°C.
• Growth can be controlled by enzyme action.
• The maximum rate of human digestion occurs at about 45°C.