Molecular Basis of Inheritance

During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and

1. RNA primers are involved
2. is facilitated by telomerase
3. moves in one direction of the site
4. moves in bi-directional way

Which form of RNA has a structure resembling clover leaf ?

1. r-RNA
2. m-RNA
3. t-RNA
4. hn-RNA

During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG, then the nucleotide sequence in the mRNA would be -

1. UAUGC
2. TCTGG
3. UATGC
4. TATGC

The following ratio is generally constant for a given species :-

1. A+CT+G
2. G+CA+T
3. A+GC+T
4. T+CG+A

DNA fingerprinting refers to :-

1. Techniques used for molecular analysis of different specimens of DNA
2. Analysis of DNA samples using imprinting devices
3. Molecular analysis of profiles of DNA samples
4. Techniques used for identification of fingerprints of individuals

The telomeres of eukaryotic chromosomes consist of short sequences of

1. Adenine rich repeats
2. Cytosine rich repeats
3. Thymine rich repeats
4. Guanine rich repeats

What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA?

1. A polypeptide of 49 amino acids will be formed
2. A polypeptide of 25 amino acids will be formed
3. Two polypeptides of 24 and 25 amino acids will be formed
4. A polypeptide of 24 amino acids will be formed

What does "lac" refer to in what we call the lac operon?

1. The number 1,00,000
2. Lac insect
3. Lactase
4. Lactose

During translation initiation in prokaryotes, a GTP molecule is needed in:

1. Association of 30S-mRNA with formyl-met-tRNA
2. Formation of formyl-met-tRNA
3. Association of 50S subunit of ribosome with initiation complex
4. Binding of 30S subunit of ribosome with mRNA

Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as 'start' or 'stop' codon?

1. UUU – Stop
2. UAC – Tyrosine
3. UGU – Leucine
4. UCG – Start