Q. No.In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :
1. G 17%, A 16.5%, T32.5%
2. G 17%, A 33%, T 33%
3. G8.5%, A50%, T24.5%
4. G 34%, A 24.5%, T 24.5%
1. G 17%, A 16.5%, T32.5%
2. G 17%, A 33%, T 33%
3. G8.5%, A50%, T24.5%
4. G 34%, A 24.5%, T 24.5%
Satellite DNA is important because it:
| 1. | shows a high degree of polymorphism in the population and also the same degree of polymorphism in an individual, which is heritable from parents to children |
| 2. | does not code for proteins and is the same in all members of the population |
| 3. | codes for enzymes needed for DNA replication |
| 4. | codes for proteins needed in the cell cycle |
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Which of the following is required as inducer(s) for the expression of Lac operon?
1. lactose and galactose
2. glucose
3. galactose
4. lactose
A complex of ribosomes attached to a single strand of RNA is known as:
| 1. | Okazaki fragment | 2. | Polysome |
| 3. | Polymer | 4. | Polypeptide |
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Which of the following is not required for any of the techniques of DNA fingerprinting available at present?
| 1. | DNA -DNA hybridization | 2. | Polymerase chain reaction |
| 3. | Zinc finger analysis | 4. | Restriction enzymes |
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Taylor conducted experiments to prove the semiconservative mode of chromosome replication on:
| 1. | E. coli | 2. | Vinca rosea |
| 3. | Vicia faba | 4. | Drosophila melanogaster |
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DNA- dependent RNA polymerase catalyzes transcription on the strand of the DNA which is called the
1. Antistrand
2. Template strand
3. Coding strand
4. Alpha strand
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If there are 999 bases in RNA that code for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?
| 1. | 1 | 2. | 11 |
| 3. | 33 | 4. | 333 |
DNA fragments are:
1. Positively charged
2. Negatively charged
3. Neutral
4. Either positively or negatively charged depending on their size
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