Satellite DNA is a useful tool in

• Organ transplantation

• Sex determination

• Forensic science

• Genetic engineering

Select the correct statement from the one’s given below with respect to dihybrid cross.

• Tightly linked gene on the same chromosome show higher recombinations

• Genes for apart on same chromosomes show very few recombination

• Genes loosely linked on the same chromosomes show similar recombination as lightly linked ones

• Tightly linked genes on the same chromosomes show very few recombination

Maximum green house gases are released by

• India

• Britain

• USA

• France

Allelic sequence variation where more than one variant allele at a locus in a human population with a frequency greater than 0.01 is referred to as

• DNA polymorphism

• Multiple allelism

• SNP

• EST

The statement All biological catalysts are protein is no longer valid after the discovery of

• ribonuclease

• ribozyme

• RNAs

• DNAs

The chromosome of cell duplicate during the

• S-phase of cell cycle

• G₁-phase of cell cycle

• G₂-phase of cell cycle

• Prophase of cell division

107.

Consider these following sentences and choose the correct ones.

(I) Each gene contains a specific promoter region and a leader sequence for guiding the beginning of transcription.

(II) Only one strand of DNA, called template strand is copied by RNA polymerase this strand runs in 3ʹ → 5ʹ direction.

(III) RNA polymerase adds complementary nucleotides forming single strand mRNA in 3ʹ → 5ʹ direction.

(IV) Section of DNA that has been transcribed is rewound into its original configuration.

• II, III and IV

• II and IV

• I, II and IV

• I, II, and IV

The fact that DNA is a genetic material was established by the experiment of

• Meselson and Stahl

• Hershey and Chase

• Avery, Macleod and McCarty

• Rosalind Franklin and Kornberg

Which of the following is the Pribnow box?

• 5′-TATAAT-3′

• 5′-TAATAT-3′

• 5′-AATAAT-3

• 5′-ATATTA-3′

The genome of Caenorhabditis elegans consists of

• 3 billion base pairs and 30,000 genes

• 12 million base pairs and 6000 genes

• 4.7 million base pairs and 4000 genes

• 97 million base pairs and 18,000 genes