Q. No.DNA or RNA segment tagged with a radioactive molecule is called:
1.
vector
2.
probe
3.
clone
4.
plasmid
Satellite DNA is a useful tool in:
1. Organ transplantation
2. Sex determination
3. Forensic science
4. Genetic engineering
Which one of the following does not follow the central dogma of molecular biology?
1. Pea
2. Mucor
3. Chlamydomonas
4. HIV
Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a triplet?
| 1. | Nirenberg and Matthaei | 2. | Hershey and Chase |
| 3. | Morgan and Sturtevant | 4. | Beadle and Tatum |
Semiconservative replication of DNA was first demonstrated in:
1. Drosophila melanogaster
2. Escherichia coli
3. Streptococcus pneumoniae
4. Salmonella typhimurium
What is not true for genetic code?
1. A codon in mRNA is read in non-contiguous fashion
2. It is nearly universal
3. It is degenerate
4. It is unambiguous
| 1. | The total amount of purine nucleotides and pyrimidine nucleotides is not always equal |
| 2. | There are two strands, which run parallel in the 5' → 3’ direction |
| 3. | The proportion of adenine in relation to thymine varies with the organism |
| 4. | There are two strands, which run antiparallel - one in 5' → 3’ direction and the other in 3’→ 5’ |
1. GUU, GCU - Alanine
2. UAG, UGA - Stop
3. AUG, ACG - Start/methionine
4. UUA, UCA -Leucine
Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they:
1. act as replicons
2. are RNA transcription initiators
3. help chromosome pairing
4. prevent chromosome loss
Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?
1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines
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