Tag: bio-chemistry

Questions Related to bio-chemistry

Cells are autonomous because___________________

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. They synthesize components of living protoplasm from non-living materials.

  2. They are able to grow and divide.

  3. Each cell has its own life span.

  4. All of the above.

Show answer
Correct Option: D
Explanation:
  • All of the living organisms are made up of cells. Cells can give rise to new cells by cell division. Each cell has a particular life span. Cells possess machinery, enzymes to form living protoplasm from non-living materials. 
  • For example, plant cells take up CO$ _2$ and O$ _2$ from the environment and make food in the presence of sunlight. Animal cells break down or oxidize glucose and form ATP. 
  • Such ATPs are used as energy currency in cell and various processes of cell formation organelle are carried out. Thus, the correct answer is option D.
Robert Hooke actually observed .......... of cells. 
bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. Cell walls.

  2. Protoplasts.

  3. Wall-less cells.

  4. Walled cells.

Show answer
Correct Option: A
Explanation:

Robert Hook discovered cells in 1655 with the help of compound microscope. He was observing insects, sand, bird feathers, fossils and plants. Once he was observing a thin slice of cork under the microscope he found a framework similar to honeycomb-like structure. He named those structures as cells but those were actually non living cell walls. So option A is correct.

Schleiden and Schwann formulated the cell theory.

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory

  1. True

  2. False

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Correct Option: A

Villi are present in

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

  1. Stomach

  2. Intestine

  3. Oesophagus

  4. Both  A and B

Show answer
Correct Option: B
Explanation:
  • Villi are small finger-like projections on the surface of the intestine which increase the area of absorption.

So, the correct answer is 'Intestine'.

Which of the following are secreted by duodenum or small intestine?

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

  1. Enterokinin

  2. Secretin

  3. Villikinin

  4. All of the above

Show answer
Correct Option: D
Explanation:

(A) Enterokinin is the hormone secreted by Brunner's gland activates the inactive enzyme of the pancreas and convert procarboxypeptidase into carboxypeptidase.

(B) Secretin secreted bu duodenum into blood stimulates the secretion of the pancreas and liver.
(C) VIlikinin is released by duodenal mucosa and increases the motility of villi.
So the correct option is 'All of the above.

The pH of human small intestine is around $7.5$ and the pH of large intestine can be $5.5$. As substances travel from the small intestine to larger intestine, what would happen to the $H^+$ ions concentration?

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

  1. Increases $20$ fold

  2. Increases $2$ fold

  3. Increases $10$ fold

  4. Increases $100$ fold

Show answer
Correct Option: D
Explanation:

pH scale is not a linear scale like a centimetre or inch scale (in which two adjacent values have the same difference). It is a logarithmic scale in which two adjacent values increase or decrease by a factor of 10. As pH 7.5 and 5.5 differ by 2, the difference in H$^{+}$ ion concentration between them would be 10$^{2}$ = 100.

So, the correct option is 'Increases 100 fold'.

Partially digested acidic food released from the stomach into the duodenum is called as ________.

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

  1. Food bolus

  2. Chyme

  3. Chyle

  4. Faeces

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Correct Option: A

If the pH of duodenum decreases below $5$, then secretion of ________ stop.

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

  1. Secretin

  2. Enterokinase

  3. CCK

  4. Gastrin

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Correct Option: A

In small intestine, active absorption occurs in case of?

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

  1. Glucose

  2. Alcohol

  3. Water

  4. All the above

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Correct Option: A

Match the two column 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-ii, D-i

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

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

Show answer
Correct Option: A