Q. No.A sequential expression of a set of human genes occurs when a steroid molecule binds to
1. mRNA
2. DNA sequence
3. tRNA
4. Ribosome
1. mRNA
2. DNA sequence
3. tRNA
4. Ribosome
The two polynucleotide chains of DNA are
1. Discontinuous
2. Antiparallel
3. Parallel
4. Semiconservative
In the DNA molecule
1. The proportion of adenine in relation of thymine varies with the organism
2. There are two strands which run antiparallel one in 5’ → 3’ direction and other in 3’ → 5’
3. The total amount of purine nucleotides and pyrimidine nucleotides is not run always equal
4. There are two strands which run paralled in the 5’ → 3’ direction.
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Which one of the following pairs of codons is correctly matched with their function or the signal for the
particular amino acid ?
1. AUG, ACG – start/methionine
2. UUA, UCA – Leucine
3. GUU – Alanine
4. UAG, UGA – stop
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What is not for genetic code
1. It is unambiguous
2. A codon in mRNA is read in a non-contiguous fashion
3. It is nearly universal
4. It is degenerate
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Semiconservative replication of DNA was first demonstrated in
1. Salmonella typhimurium
2. Drosophila melangaster
3. Escherichia coli
4. Streptococcus pneumonia
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Removal of introns and joining of exons in a defined order during transcription is called:
1. Looping
2. Inducing
3. Slicing
4. Splicing
The one aspect which is not a salient feature of genetic code, is its being
1. Ambiguous
2. Universal
3. Specific
4. Degenerate
Select the two correct statements out of the four (a-d) given below about lac operon :
| (a) | Glucose or galactose may bind with the repressor and inactivate it. |
| (b) | In the absence of lactose, the repressor binds with the operator region. |
| (c) | The z-gene codes for permease. |
| (d) | This was elucidated by Francois Jacob and Jacque Monod. |
The correct statements are :
| 1. | (a) and (c) | 2. | (b) and (d) |
| 3. | (a) and (b) | 4. | (b) and (c) |
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Satellite DNA is useful tool in
1. Sex determination
2. Forensic science
3. Genetic engineering
4. Organ transplantation
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