Digestion and Absorption Test

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Digestion and Absorption Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Rennin acts on

A
Milk changing casein into calcium paracaseinate at 7.2 - 8.2 pH

B
Proteins in stomach

C
Fat in intestine

D
Milk changing casein into calcium paracaseinate at 1 - 3 pH

Solution

Rennin curdles milk protein caseinogens, which is hydrolysed into casein. Rennin converts casein into solid calcium paracaseinate in presence of Ca$$^{2+}$$ at pH of 1 - 3 so that pepsin can reduce it to smaller protein particles.
Question 2
1 / -0

Pepsinogen is converted to pepsin by

A
Low pH

B
Trypsinogen

C
Chymotrypsin

D
Enterokinase

Solution

Pepsinogen is converted to pepsin, which digests proteins. Pepsinogen production is stimulated by the presence of gastrin in the blood. Hydrochloric acid ($$HCl$$), converts pepsinogen to pepsin, which breaks down proteins to peptides. $$HCl$$ maintains a pH in the stomach of approximately 2.0.
Question 3
1 / -0

Which of the following is absorbed in ileum?

A
Fat

B
Bile salts

C
Vit-K

D
Glucose

Solution

Ileum is the final and longest segment of the small intestine. It is specifically responsible for the absorption of vitamin $$B_{12}$$ and the reabsorption of conjugated bile salts.
So, the correct answer is 'Bile salts'
Question 4
1 / -0

Glucose is transported to cell by

A
$${ Na }^{ + }$$ Symport

B
$${ K }^{ + }$$Symport

C
$${ Na }^{ + }$$ Antiport

D
$${ K }^{ + }$$Antiport

Solution

Carbohydrates are hydrolysed by concerning enzymes and converted into monosaccharides like glucose and fructose. Monosaccharides are absorbed via the capillary blood with in the villus to finally reach into portal vein. Absorption of glucose molecules occurs along with, Na+ by active import. Fructose is absorbed passively through facilitated diffusion.
Question 5
1 / -0

Human is unable to digest dietary

A
Glycogen

B
Glucose

C
Dextrin

D
Cellulose

Solution

Cellulose is a linear polysaccharide polymer with many glucose monosaccharide units. The acetal linkage is beta, which makes it different from starch. This peculiar difference in acetal linkages results in a major difference in digestibility of humans. Humans are unable to digest cellulose, because the appropriate enzymes to breakdown the beta acetal linkages are lacking.
Question 6
1 / -0

Enzymes which does act on low pH are called as

A
Protease

B
$$\alpha -$$Amylase

C
Hydrolases

D
Peroxidase

Solution

Hydrolases are the hydrolytic enzymes which are active at low pH. These enzymes are present in the lysosomes and are called as acid hydrolases. A low pH is actively maintained in the lysosomes with the help of proton pump present in the lysosomal membrane which actively pumps protons into the lysosomes.
Question 7
1 / -0

In mammals, milk is digested by action of

A
Rennin

B
Amylase

C
Internal bacteria

D
Invertase

Solution

The coagulation of milk in the stomach of a young mammal is done by an enzyme secreted by glands in the stomach and known as rennin. This enzyme is especially abundant in the mucous lining of the stomach of young mammals. In the presence of calcium, rennin changes irreversibly the casein of milk to a paracasein, which is then acted upon by pepsin. This enzyme is absent from the stomach of adults.
Question 8
1 / -0

Which food substance is absorbed during digestion?

A
Carbohydrates

B
Proteins

C
Vitamins

D
Fats

Solution

Vitamins are not digested but absorbed in the gastrointestinal tract. Carbohydrate, protein and fats require digestion before they can be absorbed in monomer form. Fat soluble vitamins are absorbed along with dietary fat, whereas water soluble vitamins are absorbed by passive diffusion. Vitamin $$B_{12}$$ is absorbed with Intrinsic factor by forming a complex.
Question 9
1 / -0

Which of the following is absorbed in proximal intestine?

A
Iron

B
Sodium

C
Bile salts

D
Vitamin $${ B }_{ 12 }$$

Solution

Absorption is the process through which the food stuff diffuses through the intestinal mucous membrane and reaches the blood. The small intestine consists of three parts anterior duodenum, middle jejunum and posterior ileum. Iron and calcium ion are absorbed in the duodenum, i.e., proximal intestine.
Question 10
1 / -0

Water absorption mainly occurs in

A
Colon

B
Intestine

C
Gastrium

D
Appendix

Solution

Water is absorbed mainly in large intestine, which turns undigested food into a coherent mass of feces. Colon absorbs water from the undigested food. Due to presence of Haustra the water absorbing surface of colon increases and it efficiently increases absorption of water.

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Digestion and Absorption Test - 34

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Digestion and Absorption Test - 34

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SHARING IS CARING

Question 1

Milk changing casein into calcium paracaseinate at 7.2 - 8.2 pH

Proteins in stomach

Fat in intestine

Milk changing casein into calcium paracaseinate at 1 - 3 pH

Solution

Question 2

Low pH

Trypsinogen

Chymotrypsin

Enterokinase

Solution

Question 3

Fat

Bile salts

Vit-K

Glucose

Solution

Question 4

$${ Na }^{ + }$$ Symport

$${ K }^{ + }$$Symport

$${ Na }^{ + }$$ Antiport

$${ K }^{ + }$$Antiport

Solution

Question 5

Glycogen

Glucose

Dextrin

Cellulose

Solution

Question 6

Protease

$$\alpha -$$Amylase

Hydrolases

Peroxidase

Solution

Question 7

Rennin

Amylase

Internal bacteria

Invertase

Solution

Question 8

Carbohydrates

Proteins

Vitamins

Fats

Solution

Question 9

Iron

Sodium

Bile salts

Vitamin $${ B }_{ 12 }$$

Solution

Question 10

Colon

Intestine

Gastrium

Appendix

Solution

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