Impeller of diameter 0.25 m with stirrer speed of 1 s-¹ is used in 2 m³ baffled bioreactor for the mixing purpose of the medium. The mixing time is equal to (assuming medium viscosity = 0.01 Pa s and density = 1000 kg m^-1)

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#Question id: 3266

#Section 3: Genetics, Cellular and Molecular Biology

One species mates at the season when daylight is increasing from 13 hours to 13 hours, 15 minutes; another species mates at the season when daylight is increasing from 14 hours to 14 hours, 15 minutes. The isolating mechanism is

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#Question id: 3688

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following enzyme has a unique ability to introduce positive and negative supercoiling of the DNA and it is the target for antibacterial agents such as ciprofloxacin/quinolones?

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#Question id: 14151

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

Which of the following statement is true?

A) PAM matrices are derived from an evolutionary model whereas the BLOSUM matrices consist of entirely direct observations. 

B) Because of BLOSUM matrices have less evolutionary meaning that is why the PAM matrices are used most often for reconstructing phylogenetic trees.

C) BLOSUM matrices are entirely derived from local sequence alignments of conserved sequence blocks, whereas the PAM matrix is based on the global alignment of full-length sequences.

D) BLOSUM matrices are more advantageous in searching databases and finding conserved domains in proteins.

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#Question id: 15015

#Section 1: Engineering Mathematics

A square matrix each of whose diagonal elements are ‘1’ and non-diagonal elements are '0’ is called 

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#Question id: 4841

#Section 3: Genetics, Cellular and Molecular Biology

The tendency of two or more than two genes to stay together during inheritance is called ___________