Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice 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

Cells are autonomous because___________________

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice 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
Robert Hooke actually observed .......... of cells. 

  1. Cell walls.

  2. Protoplasts.

  3. Wall-less cells.

  4. Walled cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Enterokinin

  2. Secretin

  3. Villikinin

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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?

  1. Increases $20$ fold
  2. Increases $2$ fold
  3. Increases $10$ fold
  4. Increases $100$ fold
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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

  1. Food bolus

  2. Chyme

  3. Chyle

  4. Faeces
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the stomach, food is mixed with gastric juices and hydrochloric acid, churning it into a semi-fluid state known as chyme. This acidic mixture is subsequently released in small portions into the duodenum through the pyloric sphincter. Bolus refers to chewed food mixed with saliva before swallowing, while chyle refers to milky lymphatic fluid containing emulsified fats found in the intestine.

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

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

  1. Secretin

  2. Enterokinase

  3. CCK

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

Secretin is a hormone released by the duodenum in response to low pH (acidic chyme). Its primary function is to stimulate the pancreas to release bicarbonate-rich fluid to neutralize the acid. If the pH is not low, the stimulus for secretin release is absent.

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Matching the anatomical terms correctly reveals that the duodenum is a U-shaped structure emerging from the stomach (A-iii). The epiglottis is a cartilaginous flap that prevents food from entering the trachea (B-i). The glottis is the opening of the windpipe (C-iv), and the caecum is a small blind sac that hosts symbiotic microorganisms (D-ii).