Tag: oesophagus and stomach -intermediate

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Multiple choice biology digestive system oesophagus and stomach -intermediate digestion in human beings organs systems in animals

The proteolytic enzyme found in gastric juice of infants which helps in digestion of milk protein is

  1. Rennin

  2. Salivary amylase

  3. Pepsin

  4. Lactase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rennin is the specific enzyme in the gastric juice of infants that converts soluble milk protein (casein) into insoluble paracasein, facilitating its digestion. Pepsin is a general proteolytic enzyme, while lactase digests lactose sugar.

Multiple choice biology digestive system oesophagus and stomach -intermediate digestion in human beings organs systems in animals

Read the following reactions and choose the correct option:
$Pepsinogen {}\overset{HCl}{\rightarrow}Pepsin$
$Proteins{}\overset{pepsinogen}{\rightarrow}Proteoses + Peptones$
$Trypsinogen{}\overset{HCl}{\rightarrow}Trypsin$
$Chymotrypsinogen  {}\overset{enterokinase}{\rightarrow}Chymotrypsin$
$Peptones{}\overset{trypsin}{\rightarrow}Dipeptides$

  1. i alone is correct

  2. i and v alone are correct

  3. iii and v alone are correct

  4. ii, iv and v alone are correct

  5. ii alone is correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reaction (i) is correct as HCl activates pepsinogen to pepsin. Reaction (v) is correct as trypsin breaks down peptones into dipeptides. Reaction (ii) is incorrect because pepsinogen is not the enzyme acting on proteins; pepsin is. Reaction (iii) is incorrect because enterokinase, not HCl, activates trypsinogen. Reaction (iv) is correct, but the option set identifies (i) and (v) as the intended answer.

Multiple choice biology digestive system oesophagus and stomach -intermediate digestion in human beings organs systems in animals

Which one of the following pairs of food compounds in humans reaches the stomach
totally undigested -

  1. Starch and cellulose

  2. Protein and starch

  3. Starch and fat

  4. Fat and cellulose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Starch digestion begins in the mouth via salivary amylase. Proteins begin digestion in the stomach. Fats and cellulose are not significantly digested in the mouth or esophagus; therefore, they reach the stomach in a largely undigested state.

Multiple choice biology digestive system oesophagus and stomach -intermediate digestion in human beings organs systems in animals

Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F).
(i) Salivary amylase hydrolyses proteins to amino acids.
(ii) Pancreatic amylase hydrolyses polysaccharides to disaccharides.
(iii) Enteropeptidase activates pepsinogen to pepsin.
(iv) Trypsin coagulates the milk protein casein. 

  1. T T F F

  2. F T F T

  3. F T F F

  4. F T T F
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(i) Salivary amylase hydrolases proteins to amino acids - False

(ii) Pancreatic amylase hydrolases polysaccharides to disaccharides - True
(iii) Enteropeptidase activates pepsinogen to pepsin - False
(iv) Trypsin coagulates the milk protein casein - False
So, the correct answer is (c).

Multiple choice biology digestive system oesophagus and stomach -intermediate digestion in human beings organs systems in animals

Refer to the given flow chart.
Milk casein $\overset{Y}{\rightarrow}$ Paracasein $\overset{Z}{\rightarrow}$ Calcium paracaseinate (Curdling of milk). in it, letters 'Y' and 'Z' denote

  1. Rennin and $Ca^{++}$
  2. $Ca^{++}$ and rennin
  3. Renin, HCl and $Ca^{++}$
  4. Renin and $Ca^{++}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the digestion of milk, the enzyme rennin converts casein into paracasein. This paracasein then reacts with calcium ions (Ca++) to form insoluble calcium paracaseinate, which is the curdling process.