Subunits present in haemoglobin are from Chemistry Biomolecules

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311.

Subunits present in haemoglobin are

  • 2

  • 3

  • 4

  • 5


C.

4

Haemoglobin is made up of four polypeptide subunits, two alpha (α) and two beta (β) subunits. Each of the four subunits consists of a heme molecule and each of them is capable of taking up one molecule of O2. Therefore, oxyhaemoglobin can be represented as Hb(O2)4.


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312.

Assertion : Carboxypeptidase is an exopeptidase.

Reason : It cleaves the N-terminal bond.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


313.

Assertion : Glycosides are hydrolysed in acidic conditions.

Reason : Glycosides are acetals.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


314.

Assertion : Activity of an enzyme is pH dependent.

Reason : Change in pH affects the solubility of the enzyme in water.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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315.

Assertion: DNA molecules and RNA molecules are found in the nucleus of a cell.
Reason: On heating, the enzymes do not lose their specific activity.

  • If both assertion and reason are true and reason is a correct explanation of the assertion.

  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

  • If the assertion is true but the reason is false.

  • If both the assertion and reason are false.


316.

The number of amino acids and number of peptide bonds in a linear tetrapeptide (made of different amino acids) are respectively

  • 4 and 4

  • 5 and 5

  • 5 and 4

  • 4 and 3


317.

In DNA, the consecutive deoxynucleotides are connected via

  • phosphodiester linkage

  • phosphomonoester linkage

  • phosphotriester linkage

  • amide linkage


318.

Which one is not a constituent of nucleic acid?

  • Uracil

  • Guanidine

  • Phosphoric acid

  • Ribose sugar


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319.

In aqueous solution glucose remains as:

  • only in the open-chain form

  • only in the pyranose form

  • only in furanose form

  • in all three forms in equilibrium


320.

Vitamin C is

  • citric acid

  • lactic acid

  • paracetamol 

  • ascorbic acid


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