Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 39397
TLS Online TPP Program

#Question id: 27314

A feature of RNA that adds to its propensity to form double-helical structures is additional non-Watson–Crick base pairs. One such example is the G:U base pair, which has

#Section 3: Genetics, Cellular and Molecular Biology

  1. hydrogen bonds between N1 of uracil and the carbonyl on C6 of guanine, and between the carbonyl on C2 of uracil and N1 of guanine.

  2.  hydrogen bonds between N3 of uracil and the carbonyl on C6 of guanine, and between the carbonyl on C6 of uracil and N7 of guanine. 
  3. hydrogen bonds between N3 of uracil and the carbonyl on C6 of guanine, and between the carbonyl on C2 of uracil and N1 of guanine.
  4. hydrogen bonds between N3 of uracil and the carbonyl on C6 of guanine, and between the carbonyl on C2 of uracil and N7 of guanine. 
More Questions
TLS Online TPP Program

#Question id: 14929

#Section 5: Bioprocess Engineering and Process Biotechnology

Escherichia coli grows with a doubling time of 0.5 h in the exponential growth phase. How much time would be required to grow the cell culture from 0.1 to 10 kgdry cell m-3 
TLS Online TPP Program

#Question id: 14930

#Section 5: Bioprocess Engineering and Process Biotechnology

E. coli grows from 0.10 to 0.50 kg dry cell m-3 in 1 h. Assuming exponential growth during this period, evaluate the specific growth rate 
TLS Online TPP Program

#Question id: 14931

#Section 5: Bioprocess Engineering and Process Biotechnology

E. coli grows from 0.10 to 0.50 kg dry cell m-3 in 1 h. Evaluate the doubling time during the exponential growth phase 
TLS Online TPP Program

#Question id: 14932

#Section 5: Bioprocess Engineering and Process Biotechnology

 E. coli grows from 0.10 to 0.50 kg dry cell m-3 in 1 h. How much time would be required to grow from 0.10 to 1.0 kg dry cell m-3? You may assume exponential growth during this period 
TLS Online TPP Program

#Question id: 14933

#Section 5: Bioprocess Engineering and Process Biotechnology

E. coli was continuously cultured in a continuous stirred tank fermenter with a working volume of 1.0 I by chemostat. A medium containing 4.0 g1-1 of glucose as a carbon source was fed to the fermenter at a constant flow rate of 0.5 I h-1, and the glucose concentration in the output stream was 0.20 g1-1, The cell yield with respect to glucose YxS was 0.42 g dry cells per gram glucose. Determine the cell concentration in the output stream 
TLS Online TPP Program

#Question id: 14934

#Section 5: Bioprocess Engineering and Process Biotechnology

E. coli was continuously cultured in a continuous stirred tank fermenter with a working volume of 1.0 I by chemostat. A medium containing 4.0 g1-1 of glucose as a carbon source was fed to the fermenter at a constant flow rate of 0.5 I h-1, and the glucose concentration in the output stream was 0.20 g I-1. The cell yield with respect to glucose YxS was 0.42 g dry cells per gram glucose. Determine specific growth rate