Biology-Grade 9-Quiz 1-Digestive System

The products of protein digestion that are absorbed by the villi in the small intestine are called

polypeptides.
nucleotides.
fatty acids.
amino acids.

Which row below has an organ incorrectly paired with its function?

a
b
c
d

At body temperature, which of these combinations is most likely to result in digestion of protein?

protein, water, pepsin
protein, HCl, pepsin
protein, bile, pepsin
protein, sodium bicarbonate, pepsin

Which of the following statements is true?

Emulsification requires enzymes.
Emulsification is a physical process.
Emulsification results in the breakdown of lipids into glycerol and fatty acids.

At body temperature, which of these combinations will result in the nutrients glycerol and fatty acids?

fat, HCl, sucrase
protein, bile, sodium bicarbonate, pepsin
fat, bile, HCl, protease
fat, bile, sodium bicarbonate, lipase

Enzymes of the digestive system are:
amylase
carbohydrase
peptidase
lipase
Match the enzyme to the substrate digested given below.

Sort elements

sucrose
lipids
proteins
starch

carbohydrases
lipase
peptidases
amylase

The correct order of structures through which the food passes is:

large intestine
rectum
stomach
small intestine

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Order the following four events that occur during lipid digestion.

emulsification by bile
physical digestion through chewing
absorption of glycerol and fatty acids into the lymph vessels
hydrolysis by lipase

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Lipase:

Acts on carbohydrates
Digests lipids into glucose molecules
Digests lipids into fatty acids and glycerol
None of the above

Food moves in the esophagus by:

Mastication
Deglutition
Peristalsis
Bolus

Chyme is:

An acidic liquid
Found in the stomach
A mixture of gastric juice and food

Lactase breaks down lactose into:

Two glucose molecules
One glucose and one fructose molecules
One glucose and one galactose molecules
One galactose and one fructose molecules

Maltose is a disaccharide sugar made of:

Sucrose + glucose
Glucose + glucose
Fructose + lactose
Fructose + fructose

The correct order of structures through which the food passes is :

Mouth – stomach – esophagus- small intestine – large intestine- anus
Mouth – small intestine – large intestine – stomach – esophagus – anus
Esophagus – mouth – small intestine – large intestine – esophagus anus
Mouth – esophagus – stomach – small intestine – large intestine – anus

Which row identifies the nutrients absorbed by the structures labelled 1 and 2 respectively?

a
b
c
d

Which row below correctly identifies the organ that produces enzymes that chemically digest proteins, starch, and fats?

a
b
c
d