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Digestion in Humans

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A starving person digests the stored food in the order

  1. proteins - fats - glycogen

  2. glycogen - fats - proteins

  3. glycogen - proteins - fats

  4. fats - glycogen - protein


Correct Option: B
Explanation:

This is the correct order as first, the stored glycogen is used, then fats and lastly protein stores are digested by the starving person.

Excessive washing of cut fruits and vegetables would lead to the loss of

  1. vitamins B and C

  2. vitamin D

  3. vitamin K

  4. protein


Correct Option: A
Explanation:

As these are water soluble vitamins, they are easily lost from the surfaces of fruits and vegetables when these are excessively washed.

Which is the longest part of the alimentary canal?

  1. Duodenum

  2. Ileum

  3. Colon

  4. Large intestine


Correct Option: B
Explanation:

Behind the duodenum, ileum is present and is the longest part of the alimentary canal.

An infant passes greenish faecal matter in first two days of birth. This is known as

  1. macrophage

  2. stercobilin

  3. meconium

  4. albumin


Correct Option: C
Explanation:

It is the greenish coloured faecal matter, which is passed in the stools of infants.

Scaly ant eater is

  1. coprophagous

  2. detritivorous

  3. myrmecophagous

  4. microphagous


Correct Option: C
Explanation:

Consumption of termites or ants is myrmecophagy, e.g. scaly ant eater.

Which of the following functions is performed by Trypsin?

  1. It converts polysaccharides to disaccharides.

  2. It converts peptides to amino acids.

  3. It converts proteins and peptones to peptides.

  4. It converts sucrose into glucose.


Correct Option: C
Explanation:

This function is performed by trypsin.

The term given to rhythmic waves of contraction passing backwards over the gut wall resulting in the pushing of the food is called

  1. regurgitation

  2. emulsification

  3. mastication

  4. peristalsis


Correct Option: D
Explanation:

It is initiated in the colon about half an hour after taking of food.

Which of the following is not found in the gastric juice of rabbit?

  1. HCl

  2. Ptyalin

  3. Pepsin

  4. Intrinsic factor


Correct Option: B
Explanation:

Salivary amylase is not found in the gastric juice, but present in the saliva.

Which part contains the thickest sub-mucosa?

  1. Large intestine

  2. Oesophagus

  3. Stomach

  4. Duodenum


Correct Option: C
Explanation:

It possesses the thickest sub mucosa.

Which of the following organs in ruminants releases pepsin and HCl?

  1. Abomassum

  2. Rumen

  3. Omassum

  4. Reticulum


Correct Option: A
Explanation:

Here the digestive juice containing pepsin and HCl is released.

What function is performed by enterokinase?

  1. It converts trypsinogen to trypsin.

  2. It converts caesin to caesinogen.

  3. It converts pepsinogen to pepsin.

  4. It converts proteins to peptides.


Correct Option: A
Explanation:

This function is performed by enterokinase.

Dental formula for frog is

  1. 3/3, 1/1, 4/4, 2/3

  2. 2/2, 1/1, 2/2, 2/2, 3/3

  3. 2/1, 0/0, 3/2, 3/3

  4. Not reconstructible as frogs are homodont (all teeth are similar) and polyphyodont (teeth arise many times in their life history).


Correct Option: D
Explanation:

Only mammals possess dental formula as they have heterodont (different set up of teeth) type set up.

What is common among amylase, trypsin and renin?

  1. These are all proteins.

  2. These are all proteolytic enzymes.

  3. These act at pH less than 7.

  4. These are all produced in the stomach.


Correct Option: A
Explanation:

These are enzymes. Hence, these are all proteins.

Which enzyme will digest proteins, if the pH of stomach is -1.6?

  1. Trypsin

  2. Amylase

  3. Pepsin

  4. Carboxypeptidase


Correct Option: C
Explanation:

Its optimum pH is 1.6.

Which vitamin is also known as vitamin G?

  1. Thiamin

  2. Riboflavin

  3. Niacin

  4. Pantothenic acid


Correct Option: B
Explanation:

It is also known as vitamin G in America.

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