Download 6.1 Digestion For each question, choose the answer you consider to

-16.1
Digestion
For each question, choose the answer you consider to be the best and indicate your choice on
the question paper by encircling it.
1.
2.
3.
During the process of digestion, fats are broken down when fatty acids are detached
from glycerol. In addition, proteins are digested to yield amino acids. What do these
two processes have in common?
A.
They are catalyzed by the same enzyme.
B.
Both occur intra-cellularly in most organisms.
C.
They involve the addition of a water molecule to break bonds (hydrolysis).
D.
Both require the presence of hydrochloric acid to lower the pH.
To leave the digestive tract, a substance must cross a cell membrane. During which
stage of food processing does this take place?
A.
ingestion
B.
digestion
C.
hydrolysis
D.
absorption
The following processes are involved in processing of food in a digestive system.
I
hydrolysis
II
absorption
III
elimination
Increasing the surface area directly facilitates which digestive processes?
4.
A.
I and III
B.
II and III
C.
I, II and III
D.
I and II
After ingestion, the first type of macromolecule to be worked on by enzymes in the
human digestive system is
A.
protein.
B.
carbohydrate.
C.
cholesterol.
D.
nucleic acid.
-25.
6.
7.
8.
9.
What is the substrate of salivary amylase?
A.
protein
B.
starch
C.
sucrose
D.
glucose
What part of the digestive system has secretions with a pH of 2?
A.
small intestine
B.
stomach
C.
pancreas
D.
liver
Which of the following statements describes pepsin?
A.
It is manufactured by the pancreas.
B.
It helps stabilize fat-water emulsions.
C.
It splits maltose into monosaccharides.
D.
It begins the hydrolysis of proteins in the stomach
Most nutrients absorbed into the lymph or bloodstream are in which form?
A.
disaccharides
B.
polymers
C.
monomers
D.
enzymes
How does the digestion and absorption of fat differ from that of carbohydrates?
A.
Processing of fat does not require any digestive enzymes, whereas the
processing of carbohydrates does.
B.
Fat absorption occurs in the stomach, whereas carbohydrates are absorbed
from the small intestine.
C.
Carbohydrates need to be emulsified before they can be digested, whereas fats
do not.
D.
Most absorbed fat first enters the lymphatic system, whereas carbohydrates
directly enter the blood.
-3Use the diagram below to answer questions 10 and 11.
10.
11.
Where does the complete digestion of carbohydrates and digestion of most fats occur?
A.
I
B.
II
C.
III
D.
IV
In which regions does digestion of carbohydrates occur?
A.
I, II and III
B.
II, III and IV
C.
III and IV
D.
I, III and IV
-412.
13.
Which of the following does not occur in the mouth?
A.
lubrication of the food
B.
beginning of protein digestion
C.
breaking the food into small fragments
D.
hydrolysis of starch into maltose
Below are characteristic features of villi found in the small intestine:
I
have numerous microvilli
II
have lacteal at the middle
III
epithelial wall is one cell thick
IV
have dense network of blood capillaries
Which features are adaptations for absorption and transport of end product(s) of
carbohydrate digestion?
14.
15.
A.
I, II and III
B.
II, III and IV
C.
II and IV
D.
I, III and IV
In the table below which option shows the correct source, substrate, product(s) and
optimum pH conditions for pancreatic protease.
Enzyme
Source
Substrate
Products
A.
pepsin
pancreas
polypeptides
dipeptides
Optimum
pH
7.8
B.
pepsin
stomach
protein
polypeptides
2.0
C.
protease
pancreas
polypeptides
dipeptides
7.8
D.
protease
pancreas
protein
polypeptides
2.0
Digestion takes place in alimentary canal. Food travels through these organs in the
following order:
A.
Mouth, oesophagus, stomach, small intestine, large intestine and rectum
B.
Mouth, oesophagus, stomach, large intestine, small intestine and rectum
C.
Mouth, stomach, oesophagus, small intestine, large intestine and rectum
D.
Mouth, stomach, oesophagus, small intestine, large intestine and rectum
-516.
17.
18.
19.
20.
Pancreatic juice which is released into duodenum contains enzymes that can split;
A.
carbohydrates, proteins, fats, minerals
B.
carbohydrates, proteins, fats, nucleic acids
C.
proteins, fats, nucleic acid, water
D.
proteins, fats, nucleic acid, vitamins
Which of the following statement is not correct regarding the function of the large
intestines?
A.
the only important secretion is mucous
B.
feces are formed and stored here
C.
main absorption is water and electrolytes
D.
digestion of vitamin K and H occur here
Which of the following is not a characteristic of the large intestine?
A.
it is divided into ascending, transverse, and descending portions
B.
it contains abundant bacteria, some of which synthesize certain vitamins
C.
is the main absorptive site
D.
it absorbs much of the water and salts remaining in the wastes
Which of the following is not a function of the stomach?
A.
receives food
B.
mixes food with gastric juice
C.
carries out limited amount of absorption
D.
moves food into the large intestine
Which of the following is not a function of the small intestines?
A.
receives secretions from the pancreas and liver
B.
completes digestion of nutrients
C.
absorbs products of digestion
D.
transports the residue to the anal canal