Q. No.One turn of the helix in a B-form DNA is approximately of the length
1.
0.34 nm
2.
3.4 nm
3.
2 nm
4.
20 nm
The two polynucleotide chains in DNA are
1. parallel
2. discontinuous
3. antiparallel
4. semi - conservative
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About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
1. phosphorus and sulphur
2. sulphur and magnesium
3. magnesium and sodium
4. calcium and phosphorus
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Which one of the following is not a constituent of cell membrane
1. Cholesterol
2. Glycolipids
3. Proline
4. Phospholipids
A competitive inhibitor of succinic dehydrogenase is
1. malonate
2. oxaloacetate
3. α-ketoglutarate
4. malate
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Three of the following statements about enzymes are correct and one is wrong, which one is wrong
1. Most enzymes are proteins but some are lipids
2. Enzymes require optimum pH for maximal activity
3. Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperatures 80°- 90°C
4. Enzymes are highly specific
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In curve of enzyme catalyzed reaction, the value of velocity of enzyme reaction at point A will be
1. and velocity may increase by increasing temperature
2. and velocity may increase by increasing substrate
3. and velocity may increase by increasing by catalyst
4. and velocity remain constant even changing any factor in to the medium.
Which one of the following enzymes carries out the initial step in the digestion of milk in humans?
1. Pepsin
2. Rennin
3. Lipase
4. Trypsin
Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component "X" in it.
Category Component
1. Cholesterol Guanine
2. Amino acid NH2
3. l Nucleotide Adenine
4. Nucleoside Uracil
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Which one of the following is a non-reducing carbohydrate?
| 1. | Maltose |
| 2. | Sucrose |
| 3. | Lactose |
| 4. | Ribose 5-phosphate |
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