Q. No.Semiconservative replication of DNA was first demonstrated in:
1. Drosophila melanogaster
2. Escherichia coli
3. Streptococcus pneumoniae
4. Salmonella typhimurium
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| 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’ |
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Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?
1. Genetic code is specific
2. Genetic code is not ambiguous
3. Genetic code is redundant
4. Genetic code is nearly universal
1. sn RNA
2. hn RNA
3. 23 S rRNA
4. 5 S rRNA
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The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C.
1. A - translation B - transcription C - Erwin Chargaff
2. A -transcription B - translation C - Francis Crick
3. A - translation B - extension C - Rosalind Franklin
4. A - transcription B - replication C - James Watson
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The association of histone H1 with a nucleosome indicates:
1. DNA replication is occurring
2. The DNA is condensed into a chromatin fibre
3. The DNA double helix is exposed
4. Transcription is occurring
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Let us presume that it is possible to view enzymes and organelles in a cell, including those involved with gene expression. A prokaryotic cell can be differentiated from a eukaryotic cell because it can be seen that:
1. the nucleotides in the promoter are different in prokaryotes and eukaryotes.
2. the actual genes are more widely-spaced apart in eukaryotes than prokaryotes.
3. ribosomes have started translating mRNA that was still being synthesized by RNA polymerase.
4. prokaryotic mRNA does not contain introns.
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The number of genes in human genome is found to be much less than what was initially expected as humans are capable of making large number of diverse proteins. This paradox can be best explained by:
1. Gene editing
2. Alternative splicing
3. Intron excision
4. Post transcriptional modification
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%
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The human chromosome with the highest and least number of genes in them are respectively:
1. Chromosome 21 and Y
2. Chromosome 1 and X
3. Chromosome 1 and Y
4. Chromosome X and Y
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