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TLS Online TPP Program

#Question id: 4313

Which of the following statements best describes the characteristics of siRNA?

#SCPH28 | Zoology

  1. a double-stranded RNA, one of whose strands can complement and inactivate a sequence of mRNA

  2. a single-stranded RNA that can, where it has internal complementary base pairs, fold into cloverleaf patterns

  3. a double-stranded RNA that is formed by cleavage of hairpin loops in a larger precursor

  4. a portion of rRNA that allows it to bind to several ribosomal proteins in forming large or small subunits

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TLS Online TPP Program

#Question id: 77

#SCPH05 I Biotechnology

Which of the pairs of molecular structures shown depict enantiomers (enantiomeric forms) of the same molecule?
TLS Online TPP Program

#Question id: 1102

#SCPH28 | Zoology

Caffeine is an inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of which of the following molecules?
TLS Online TPP Program

#Question id: 14312

#SCPH05 I Biotechnology

An industrial waste-water stream is fed to a stirred-tank reactor continuously and the cells are recycled back to the reactor from the bottom of the sedimentation tank placed after the reactor. The following are given for the system: F = 100 l/h; S0 = 5000 mg/l; mm = 0.25 h-1 ; Ks = 200 mg/l; α (recycle ratio) = 0.6; C (cell concentration factor) = 2; Y M X/S = 0.4. The effluent concentration is desired to be 100 mg/l.  Determine the required reactor volume.

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TLS Online TPP Program

#Question id: 12580

#SCPH06 I Botany

When levels of CO2 are experimentally increased, C3 plants generally respond with a greater increase in productivity than C4 plants. This is because
TLS Online TPP Program

#Question id: 752

#I Life Science/ Life Sciences Group – I-V

The A260/A280 ratio of a double-stranded DNA sample can be used to assess its purity. The value for the pure DNA is ----------------