The inside of a cell is a

  • reducing medium

  • oxidising medium

  • neutral medium

  • None of these

O2 binding in Hb is

  • pH dependent

  • pH independent

  • O2 binds at neutral pH

  • None of these

Release of O2 from oxyhaemoglobin is favoured by

  • high pH and low CO2 conc

  • low pH and low CO2 conc

  • high pH and high CO2 conc

  • low pH and high conc. of CO2 

Nitrogenase enzyme contains

1. Fe-S protein

  • 3. Both 1 nd 2

  • 2. Mo-Fe-S protein

  • 3

  • 4. None of the above

The biological role of Cytochrome P-450 is

  • Nitrogen fixation

  • Oxidation of RH to ROH

  • Amide hydrolysis

  • Oxidation of amino acid.

The metal that is not prevalent in the biological system is

  • Platinum

  • Manganese

  • Cobalt

  • Nickel

Hemerythrin belongs to the group of

  • Non-heme iron protein

  • Binuclear copper protein

  • Heme-iron protein

  • None of these. 

Which of the following metalloproteins does not have iron in the active site?

  • Hemoglobin

  • Hemerythrin

  • Hemocyanin

  • Cytochrome c

Which of the following is a heme iron protein?

  • Rubredoxin

  • Transferrin

  • Hemerythrin

  • Cytochrome c

The reduction of nitrogen to ammonia, carried out by the enzyme nitrogenase needs

  • 2e- 

  • 4e- 

  • 6e- 

  • 8e- 

Iron-sulphur clusters in biological systems are involved in

  • group-transfer

  • proton transfer

  • atom transfer

  • e- transfer

The extent of π electron conjugation in macrocyclic rings (i) heme, (ii) coenzyme B12 and (iii) chlorophyl follows the order

  • (i)>(iii)>(ii)

  • (i)>(ii)>(iii)

  • (iii)>(i)>(ii)

  • (ii)≈(i)>(iii)

Molybdoenzymes can both oxidize as well as reduce the substrates, because

  • Mo(VI) is more stable than Mo(IV)

  • Mo(IV) can transfer oxygen atom to the substrate and Mo(VI) can abstract oxygen atom from the substrate

  • Conversion of Mo(VI) to Mo(IV) is not favoured

  • Mo(VI) can transfer oxygen atom to the substrate and Mo(IV) can abstract oxygen atom from the substrate

Which is not a macromolecule?

  • DNA

  • Starch

  • Palmitate

  • Insulin

The reaction of concentrated sulphuric acid with carbohydrates (C12H22O11) is an example of

  • Dehydration

  • Oxidation

  • Reduction

  • Sulphonation

An anomers is represented by -

  •  

  •  

  •  

  •  

The product of D-glucose with HI is -

 

  • Neo-pentane

  • n-Hexane

  • Cyclohexane

  • Glucaric acid 

The fat-soluble vitamin(s) is/are-

  • Vitamin A

  • Vitamin B

  • Vitamin E

  • Both 1 and 3

Why cannot vitamin C be stored in our body? 

  • Because it is unstable.

  • Because it is a fat-soluble vitamin.

  • Because it is a water-soluble vitamin.

  • None of the above

Glycogen is a branched-chain polymer of α-D glucose units in which chain
is formed by C1 - C4 glycosidic linkage whereas branching occurs by the
formation of C1 - C6 glycosidic linkage. The structure of glycogen is similar to

  •   Amylose

  •   Amylopectin

  •   Cellulose

  •   Glucose

An anomer is represented by: 

  •  

  •  

  •  

  •  

In disaccharides, if the reducing groups of monosaccharides, i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?                          

  •  

  •  

  •  

  •  

Carbon atoms of pentose sugars of nucleotides having phosphodiester linkage are -
  • 5' and 3'
  • 2' and 5'
  • 5' and 5'
  • '3 and 3'

Nucleic acids are the polymers of : 
  • Nucleosides
  • Nucleotides
  • Bases
  • Sugars

The incorrect statement among the following regarding glucose is -
  • It is an aldohexose.
  • n-Hexane is formed when glucose is heating with HI.
  • It is present in furanose form.
  • It does not give 2, 4- DNP test.

Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be .....

  • Primary structure of proteins

  • Secondary structure of proteins

  • Tertiary structure of proteins

  • Quaternary structure of proteins

 RNA does not contain -
  • Adenine
  • Uracil
  • Thymine
  • Cytosine

DNA does not have -
  • Adenine
  • Thymine
  • Cytosine
  • Uracil

A reactions among the following of glucose can be explained only by it's cyclic structure is -
  • Glucose forms pentaacetate.
  • Glucose reacts with hydroxylamine to form an oxime.
  • Pentaacetate of glucose does not react with hydroxylamine.
  • Glucose is oxidized by nitric acid to saccharic acid.

 D configuration is shown by -
  • i, ii, iii
  • ii, iii
  • i, ii
  • iii

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