Q. No.Differentiation of organs and tissues in a developing organism is associated with:
1. developmental mutations
2. differential expression of genes
3. lethal mutations
4. deletion of a gene
The two polynucleotide chains in DNA are:
1. parallel
2. discontinuous
3. antiparallel
4. semiconservative
Amino acid sequence, in protein synthesis is decided by the sequence of:
1. t-RNA
2. m-RNA
3. c-DNA
4. r-RNA
Antiparallel strands of a DNA molecule mean that:
| 1. | one strand turns anti-clockwise |
| 2. | the phosphate groups of two DNA strands, at their ends, share the same position |
| 3. | the phosphate groups at the start of two DNA strands are in opposite positions (pole) |
| 4. | one strand turns clockwise |
Match the following genes of the lac operon with their respective products:
| (a) | i gene | (i) | -galactosidase |
| (b) | Z gene | (ii) | Permease |
| (c) | A gene | (iii) | Repressor |
| (d) | Y gene | (iv) | transacetylase |
Select the correct option
| Options: | (a) | (b) | (c) | (d) |
| 1. | (iii) | (iv) | (i) | (ii) |
| 2. | (i) | (iii) | (ii) | (iv) |
| 3. | (iii) | (i) | (ii) | (iv) |
| 4. | (iii) | (i) | (iv) | (ii) |
Purines found both in DNA and RNA are:
| 1. | Cytosine and thymine | 2. | Adenine and thymine |
| 3. | Adenine and guanine | 4. | Guanine and cytosine |
Under which of the following conditions will there be no change in the reading frame of the following mRNA?
5'AACAGCGGUGCUAUU 3'
| 1. | Deletion of GGU from 7th, 8th and 9th positions |
| 2. | Insertion of G at the 5th position |
| 3. | Deletion of G from the 5th position |
| 4. | Insertion of A and G at the 4th and the 5th positions respectively |
Expressed Sequence Tags (ESTs) refers to:
1. Novel DNA sequence
2. Genes expressed as RNA
3. Polypeptide expression
4. DNA polymorphism
The length of the DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?
1. Deletion of non-essential genes
2. Super-coiling in nucleosomes
3. DNAse digestion
4. Through the elimination of repetitive DNA
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