GRADE 8 QUIZ 2-DIGESTION

Which of the following explains digestion?

• It is the process of breaking down food into simple substance our body can absorb.

• It is the elimination of undigested food that were not absorb by the body.

• It is the absorption and circulation of nutrients in the body.

• It the process of supplying the cell with nutrients

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.

Which of the following digestive organ absorbs the nutrients?

• esophagus

• mouth

• large intestine

• small intestine

What substance that speed up the chemical reaction in digestion?

• enzymes

• digestive juices

• bile

• water

What enzyme breaks down carbohydrates?

• Amylase

• Lipase

• Protease

What enzyme is responsible for the breakdown of fats and oil?

• Amylase

• Lipase

• Protease

It is a digestive enzymes that break down amino acids?

• Amylase

• Lipase

• Protease

In what organ does mechanical and chemical digestions begin?

• Mouth

• Stomach

• Small Intestine

• Large Intestine

Where do substrates bind on an enzyme?

• voltage-gated channels
• surface receptor
• calcium channels
• active site

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6
  
• The optimum pH of the enzyme is 5.0
  
• Activity increases from pH 6.6 to 9.0
• The enzyme denatures at pH 6.6