Which technique separates nucleic acids (DNA and RNA) by molecular weight?

#Question id: 14604

#Section 2: General Biology

#Question id: 4834

#Section 3: Genetics, Cellular and Molecular Biology

Alleles of different genes that are on the same chromosome can occasionally be separated by a phenomenon called

#Question id: 14273

#Section 5: Bioprocess Engineering and Process Biotechnology

Nicotiana tabacum cells are cultured to high density for production of polysaccharide gum. The reactor used is a stirred tank, containing initially 100 litres medium. The maximum specific growth rate of the culture is 0.18 d^-1 and the yield of biomass from substrate is 0.5 g g^-l. The concentration of growth-limiting substrate in the medium is 3% (w/v). The reactor is inoculated with 1.5 g l^{- 1} cells and operated in batch until the substrate is virtually exhausted; medium flow is then started at a rate of 4 l d^-1. Fed-batch operation occurs under quasi-steady-state conditions. Estimate the batch culture time.                                  ____________________

#Question id: 3933

#Section 3: Genetics, Cellular and Molecular Biology

A gene contains two 100 bp introns and three 50 bp exons. About how long is the mature RNA transcribed from this gene?

#Question id: 3934

#Section 3: Genetics, Cellular and Molecular Biology

The purpose of the GTP cap on mRNA is __.