Tag: biology

Questions Related to biology

Consider the following statements :I. Nicotinamide (anti pellagra) occurs in milk, yeast, meat and leafy vegetables
II. Crypts of Lieberkuhn occur in liver
III. Steapsin is pancreatic amylase

biology digestion and absorption liver functions of the liver secretory organs

  1. II and III are correct

  2. II and III are incorrect

  3. I and II are correct

  4. I and III are correct

  5. I and III are incorrect

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Correct Option: B

If liver is removed, the component that increases in blood

biology digestion and absorption liver functions of the liver secretory organs

  1. Protein

  2. Urea

  3. Uric acid

  4. Ammonia.

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Correct Option: D

Organs functioning as modulator and effector for homeostatic control of blood sugar are respectively

biology digestion and absorption liver functions of the liver secretory organs

  1. Liver and islets of Langerhans

  2. Islets of Langerhans and hypothalamus

  3. Hypothalamus and islets of Langerhans

  4. Hypothalamus and liver.

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Correct Option: A

Angiotensinogen is a protein produced by

biology digestion and absorption liver functions of the liver secretory organs

  1. Macula densa cells

  2. Liver cells

  3. Juxtaglomerular cells

  4. Endothelial cells

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Correct Option: B
Explanation:
Angiotensinogen is a plasma protein produced and secreted by liver cells. It is a sole precursor of all angiotensin peptide. Juxtaglomerular cells secrete renin which acts on angiotensinogen to release angiotensin I and then it is converted to angiotensin II by the action of enzyme angiotensin-converting enzymes.
So, the correct answer is 'Liver cells'.

The conversion of $NH _{3}$ into urea occurs in


biology digestion and absorption liver functions of the liver secretory organs

  1. Intestine

  2. Spleen

  3. Kidney

  4. Liver

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Correct Option: D

If liver is removed, which component of blood will increase?

biology digestion and absorption liver functions of the liver secretory organs

  1. Ammonia

  2. Protein

  3. Uric acid

  4. Urea

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Correct Option: A
Explanation:
  • Animals accumulate ammonia, urea, uric acid, carbon dioxide, water and ions like Na +, K+, Cl–, phosphate, sulphate, etc., either by metabolic activities or by other means like excess ingestion. 
  • These substances have to be removed totally or partially. Ammonia, urea and uric acid are the major forms of nitrogenous wastes excreted by the animals.  Ammonia is rapidly removed from the liver by urea cycle.
  • Urea cycle takes place in the liver in which the ammonia is converted into a water-soluble compound known as urea. Urea formed is a non-toxic excretion product whereas Ammonia is toxic to the CNS because it reacts with the α-ketoglutarate to form glutamate. Hence, If the liver is removed, which component of blood will increase is ammonia.
So, the correct answer is 'ammonia'.

Lymphocytes of lower vertebrates are produced in

biology digestion and absorption liver functions of the liver secretory organs

  1. Liver

  2. Spleen

  3. Bone marrow

  4. Vertebrae.

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Correct Option: A

Consider the following statements.
a. Beta-oxidation takes place only in glyoxisomes and not in cytosol.
b. When fatty acids undergo betaoxidation to form acetyl coA, only NADH is produced and not $FADH _2$.
Which of the statements given is/are correct?

biology digestion and absorption liver functions of the liver secretory organs

  1. $1$ only

  2. $2$ only

  3. Both $1$ and $2$

  4. Neither $1$ nor $2$

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Correct Option: A

Liver is able to manufacture vitamin.

biology digestion and absorption liver functions of the liver secretory organs

  1. $A$

  2. $B$

  3. $K$

  4. $D$

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Correct Option: C

Which of the following lipoproteins in blood remove excess cholesterol from body cells and transport it to the liver for elimination ?

biology digestion and absorption liver functions of the liver secretory organs

  1. HDL

  2. LDL

  3. VLDL

  4. Both (B) and (C)

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Correct Option: A