As the two strands of the double helix are separated, the positive supercoiling interferes with the further unwinding of DNA. Which of the following enzyme makes a break in a strand of DNA to release the supercoiling and facilitate the replication to occur?

#Question id: 14246

#Section 5: Bioprocess Engineering and Process Biotechnology

A steam steriliser is used to sterilise liquid medium for fermentation. The initial concentration of contaminating organisms is 10⁸ per litre. For design purposes, the final acceptable level of contamination is usually taken to be 10^-3cells; this corresponds to a risk that one batch in a thousand will remain contaminated even after the sterilisation process is complete. For how long should 1 m³ medium be treated if the temperature is 80⁰C ________________.10^6

 To be safe, assume that the contaminants present are spores of Bacillus stearothermophilus, one of the most heat-resistant microorganisms known. For these spores the activation energy for thermal death is 283 kJ gmo1^-1 and the Arrhenius constant is 10^36.2 s^-1

#Question id: 4848

#Section 3: Genetics, Cellular and Molecular Biology

Neurospora strain with genotype AB was cross to another strain with genotype ab. Following different ascus and their appropriate number given in table.

Distance map unit between Gene A and centromere?

#Question id: 1154

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following events do not occur during the epinephrine-stimulated conversion of glycogen to glucose-1-phosphate?

#Question id: 16788

#Section 1: Engineering Mathematics

If he arithmetic mean between a " 1 and b, then n is equal to 

#Question id: 14662

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology