If one strand of DNA has the nitrogenous base sequence as ATCTG, what would be the complementary RNA strand sequence?

(1) TTAGU

(2) UAGAC

(3) AACTG

(4) ATCGU

Removal of introns and joining of exons in a defined order during transcription is called

(1) looping

(2) inducing

(3) capping

(4) splicing

What are those structures that appear as ‘beads-on-string’ in the chromosomes when viewed under electron microscope?

(1) Nucleotides

(2) Nucleosomes

(3) Base pairs

(4) Genes

Select the two 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 Jacques Monod

The correct statements are

1. (B) and (C)

2. (A) and (C)

3. (B) and (D)

4. (A) and (B)

The one aspect which is not a salient feature of genetic code, is its being

(1) degenerate

(2) ambiguous

(3) universal

(4) specific

Satellite DNA is 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 Mathaei

(2) Hershey and chase

(3) Morgan and Sturtevant

(4) Beadle and Tatum

Semi-conservative 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 a non-contiguous fashion

2. It is nearly universal

3. It is degenerate

4. It is unambiguous