Q. No.An organic substance bound to an enzyme and essential for its activity is called
1. holoenzyme
2. apoenzyme
3. isoenzyme
4. coenzyme
1. holoenzyme
2. apoenzyme
3. isoenzyme
4. coenzyme
An enzyme that can stimulate germination of barley seeds is
1. α-amylase
2. lipase
3. protease
4. invertase
Antibodies in our body are complex
1. Steroids
2. prostaglandins
3. Glycoproteins
4. Lipoproteins
Antiparallel strands of a DNA molecule means that
| 1. | the phosphate groups of two DNA strands, at their ends, share the same position |
| 2. | the phosphate groups at the start of two DNA strands are in opposite position (pole) |
| 3. | one strand turns clockwise |
| 4. | one strand turns anti-clockwise |
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
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
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
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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