Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

Which one of the following pairs of the cells with their secretion is correctly matched?

  1. Oxyntic cells- A secretion with pH between 2.0 and 3.0

  2. Alpha cells of Islets of Langerhans- Secretion that decreases blood sugar level

  3. Kupffer cells- A digestive enzyme that hydrolysis nucleic acids

  4. Sebaceous glands- A digestive enzyme that hydrolysis nucleic acids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxyntic cells or parietal cells, are the stomach epithelium cells that secrete gastric acid intrinsic factor. These cells secrete hydrochloric acid (HCl), which makes the gastric juice acidic (pH =2 -3). 

Oxyntic cells  are the epithelial cells that secrete hydrochloric acid (HCl) and intrinsic factor. These cells are located in the gastric glands found in the lining of the fundus and in the body of the stomach.
Alpha cells of islets of Langerhans secretes glucagon hormone, which increase the glucose level in the blood by converting glycogen to glucose in liver cells. 

Kupffer cells are specialized cells in the liver that destroy bacteria, foreign proteins and worn-out blood cells. 
Sebaceous glands and microscopic glands in the skin that secrete an oily/waxy matter (called as sebum) to lubricate the skin and hair of mammals.

Therefore, the correct answer is option A.

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

Which of the following best represents the enzyme composition of pancreatic juice?

  1. Amylase, peptidase, trypsinogen, rennin

  2. Lipase, amylase, trypsinogen, peptidase

  3. Lipase, amylase, pepsin, maltase

  4. Peptidase, amylase, pepsin, rennin
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pancreatic juice is liquid secetrted by pancreas . It is alkaline in nature and it has following enzymes lipase, for digesting fats, amylase for digesting starch, trypsinogen for digesting proteins.

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

The end products of protein digestion are

  1. monosaccharides

  2. steroids

  3. amino acids

  4. fatty acids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  1. Amino acids and proteins are the building blocks of life. Amino acids are organic compounds that combine to form proteins.
  2.  When proteins are digested or broken down, amino acids are left. Zymogenic cell or peptic cell in the stomach that releases pepsinogen and chymosin. 
  3. This inactive pepsinogen, on exposure to hydrochloric acid, gets converted to the active enzyme pepsin.
  4.  Pepsin is produced in the stomach and is one of the main digestive enzymes, which helps in digestion of the proteins to polypeptide chains. The end product of protein is it must be broken down into amino acids. Hence, the end product of protein digestion is amino acids.
So, the correct answer is 'amino acids'.

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

A pancreatic zymogen secreted into the duodenum, can be activated by:-

  1. trypsin

  2. pepsin

  3. secretin

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

Enteropeptidase is an enzyme produced by the cells of the duodenum and is involved in the digestion in humans and other animals. Enteropeptidase converts trypsinogen (a zymogen) into its active form trypsin, resulting in the subsequent activation of pancreatic digestive enzymes

So, the correct answer is 'trypsin'

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen? 

  1. The pancreatic enzymes and specially the trypsin and lipase will not work efficiently.

  2. The pH of stomach will fall abruptly.

  3. Steapsin will be more effective.

  4. Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parietal cells secrete HCl and intrinsic factor. Parietal glands also secrete pepsinogen to which hydrochloric acid acts to convert it into pepsin. Pepsin in return causes digestion of protein. If parietal cells become non-functional, it will directly affect protein digestion. So, the correct answer is (d).

Multiple choice bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

When the acidic food from stomach comes to small intestine which of the following acts on it to make it alkaline?

  1. Bile

  2. Trypsin

  3. Pepsin

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The pancreatic enzymes and intestinal enzymes are optimally active in alkaline pH (8.0-8.4) in the small intestine.
  • Thus, the acidic food from stomach is made alkaline by the action of bile.
  • Bile is alkaline in nature as it contains organic salt known as bile salt.