Tag: digestion in small intestine

Questions Related to digestion in small intestine

Various types of movements are generated by the ________ layer of the small intestine. 

bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

  1. serosa

  2. muscularis

  3. mucosa

  4. sub-mucosa

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Correct Option: B
Explanation:

Various types of movements are generated by the 'muscular' layer of the small intestine.

So the correct option is B.

Which of the following statements is false?

bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

  1. The breakdown of most of biomacromolecules occurs in duodenum.

  2. Simple substances (digested foods) are absorbed in the jejunum and ileum.

  3. Significant digestive activity occurs in large intestine.

  4. Undigested and unabsorbed substances are passed on to the large intestine.

Show answer
Correct Option: C
Explanation:

The correct answer is (c).

Match the two columns and select the right one among options given.

Column I Column II
A. Duodenum  (i) A cartilaginous flap
B. Epiglottis  (ii) Small blind sac
C. Glottis  (iii) 'U' shaped structure emerging from the stomach
D. Caecum  (iv) Opening of wind pipe
bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

  1. A-(i), B-(ii), C-(iii), D-(iv)

  2. A-(iv), B-(iii), C-(iv), D-(i)

  3. A-(iii), B-(i), C-(iv), D-(ii)

  4. A-(ii), B-(iv), C-(i), D-(iii)

Show answer
Correct Option: C
Explanation:

(A) Duodenum - 'U' shaped structure emerging from the stomach

(B) Epiglottis - A cartilaginous flap
(C) Glottis - Opening of wind pipe
(D) Caecum - Small blind sac
So, the correct answer is (c).

Select the incorrect statement.

biology digestive system digestion in small intestine digestive glands and their secretions alimentary canal

  1. Lipases and nucleases are not present in pancreatic juice.

  2. Goblet cells secrete mucus.

  3. Brunner's glands are sub-mucosal glands.

  4. Carboxypeptidase catalyses conversion of proteins, peptones and proteoses to dipeptides.

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Correct Option: A
Explanation:

The correct answer is (a).

Digestion of food
Which one of the following is the coned matching of the site of action on the given substrate, the enzyme acting upon it and the end product ?

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Small intestine : Proteins $\overset{Pepsin}{\rightarrow}$ Amino acids

  2. Stomach : Fats $\overset{Lipase}{\rightarrow}$ Micelles

  3. Duodenum : Triglycerides $\overset{Trypsin}{\rightarrow}$ Monoglycerides

  4. Small intestine.: Starch $\overset{\alpha - amylase}{\rightarrow}$ Disaccharide (maltose)

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Correct Option: D

Isomaltase catalyzes the hydrolysis of bonds as shown in

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. glc(1-6)glc

  2. glc(1-4)glc

  3. gal(1-6)glc

  4. fru(1-6)glc

Show answer
Correct Option: A
Explanation:

Isomaltase is an enzyme that breaks the bonds linking saccharides, which cannot be broken by amylase or maltase. It digests polysaccharides at the alpha 1-6 linkages

So, the correct option is 'glc(1-6)glc'

Which of the following is a group of end products of carbohydrate digestion?

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Glucose, galactose, maltose

  2. Sucrose, galactose, maltose

  3. Galactose, glucose, fructose

  4. None of the above

Show answer
Correct Option: C
Explanation:

The end product of carbohydrate digestion is mainly glucose together with some fructose and galactose (monosaccharide). 

Chylomicrons are __________________.

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Fat droplets coated with phospholipids

  2. Fat droplets coated with cholesterol and protein

  3. Undigested proteins

  4. Undigested carbohydrates

Show answer
Correct Option: B
Explanation:

  • Fatty acids and glycerol being insoluble, cannot be absorbed into the blood. So, they are first incorporated into small droplets called micelles which move into the intestinal mucosa. 
  • They are then re-formed into very small protein coated fat globules called the chylomicrons which are transported into the lymph vessels (lacteals) in the villi. These lymph vessels ultimately release the absorbed substances into the bloodstream. Hence, chylomicrons are fat droplets coated with cholesterol and proteins.
So, the correct answer is 'fat droplets coated with cholesterol and proteins'.

Fat is completely digested in the

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Stomach

  2. Mouth

  3. Small intestine

  4. Large intestine

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Correct Option: C
Explanation:
  • Digestion of some fats can begin in the mouth where lingual lipase breaks down some short chain lipids into diglycerides. However, fats are completely digested in the small intestine.
  • Fat is completely digested in the small intestine because it gets bile from the liver through gallbladder which is responsible for fat digestion.
  • Hence Fat is completely digested in the Small intestine.
  • So, the correct answer is 'Small intestine'.

Carbohydrates in the chyme are hydrolysed to disaccharide by amylase of 

biology digestion and absorption digestion in small intestine digestive glands and their secretions alimentary canal

  1. Pancreatic juice

  2. Gastric juice

  3. Brunners gland

  4. Crypts of Lieberkuhn

Show answer
Correct Option: A
Explanation:

The chyme produced by digestion in the stomach is passed on to the small intestine for further digestion and absorption where the enzyme pancreatic amylase of the pancreatic juice converts the carbohydrates present in the chyme into disaccharides and monosaccharides. 

So, the correct answer is 'Pancreatic juice'.