Q. In the medium where E. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down sometime after addition of lactose in the medium?

Q. Briefly describe the following:
(a) Transcription
(b) Polymorphism
(c) Translation
(d) Bioinformatics

Q. If a double stranded DNA has 20 percent of cytosine, calculate the percent of adenine in the DNA.

Q. What is DNA fingerprinting? Mention its application.

Q. Differentiate between the followings:
(a) Repetitive DNA and Satellite DNA
(b) mRNA and tRNA
(c) Template strand and Coding strand

Q. If the sequence of one strand of DNA is written as follows:

Q. Which property of DNA double helix led Watson and Crick to hypothesise semi-conservative mode of DNA replication? Explain.

Q. How did Hershey and Chase differentiate between DNA and protein in their experiment while proving that DNA is the genetic material?

Q. List two essential roles of ribosome during translation.

Q. Depending upon the chemical nature of the template (DNA or RNA) and the nature of nucleic acids synthesised from it (DNA or RNA), list the types of nucleic acid polymerases.

Q. If the sequence of the coding strand in a transcription unit is written as follows:
5'-ATGCATGCATGCATGCATGCATGCATGC-3'
Write down the sequence of mRNA.

Q. Group the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.

Q. Explain (in one or two lines) the function of the following:
(a) Promoter
(b) tRNA
(c) Exons

Q. Why is the Human Genome project called a mega project?