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

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#Question id: 18722

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

Which DNA ligase enzyme is used in genetic engineering?

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#Question id: 1653

#Section 2: General Biology

Which of the following statements does NOT apply to IgG?

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#Question id: 14780

#Section 1: Engineering Mathematics

A and B throws two dice; if A throws 9 then B’s chance of throwing a higher number is 1/6 , state whether the above statement is true or false.

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#Question id: 14845

#Section 1: Engineering Mathematics

Four persons are chosen at random from a group containing 3 men, 2 women and 4 children. The chance that exactly 2 of them will be children is

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#Question id: 3862

#Section 3: Genetics, Cellular and Molecular Biology

The largest gene characterized to date is: