Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 20147
TLS Online TPP Program

#Question id: 18852

What is the starting point for selection of a suitable IEX matrix for purification of a recombinant protein?

#Unit 13. Methods in Biology
  1. Prediction of isoelectric point (pI) from the amino acid sequence
  2. Test protein binding to an IEX matrix at a range of pHs and salt concentrations
  3. Test protein binding to a selection of anion and cation exchange matrices
  4. Pass your sample through a preparative column and elute with a salt gradient
More Questions
TLS Online TPP Program

#Question id: 18083

#Unit 8. Inheritance Biology

The interaction of selection and inbreeding in determining the incidence of autosomal recessive diseases. Consider a gene in which recessive mutations occur at a rate of 10-5. Assume a selective disadvantage S of 0.4 in homozygotes for the recessive allele. Would q be expected to rise, fall, or remain unchanged during the first 10 generations after the cessation of inbreeding, Briefly justify your answer. What numerical value would q approach after thousands of generations with no inbreeding?
TLS Online TPP Program

#Question id: 18087

#Unit 13. Methods in Biology

Each of five questions on a multiple-choice examination has four choices, only one of which is correct. The student is attempting to guess the answers. The random variable X is the number of questions answer correctly. Probability that the student will get
Exactly three correct answers
TLS Online TPP Program

#Question id: 18088

#Unit 13. Methods in Biology

If a coin is tossed 5 times, then consider the following statements:
I: Probability of getting exactly 2 heads is 5/16.
II: Probability of getting at least 4 heads is 3/16.
III: Probability of getting at most 2 heads is 5/8.
Which one of the following is correct in respect of the above statements
TLS Online TPP Program

#Question id: 18219

#Unit 1. Molecules and their Interaction Relevant to Biology

Pseudoknot loop refers to 
TLS Online TPP Program

#Question id: 18221

#Unit 9. Diversity of Life Forms

In animal cells and in the meristem cells of land plants, the nuclear envelope disintegrates during mitosis. This disintegration does not occur in the cells of most protists and fungi. According to our current knowledge of plant evolution, which group of organisms should feature mitosis most similar to that of land plants? 
TLS Online TPP Program

#Question id: 18222

#Unit 9. Diversity of Life Forms

Which event during the evolution of land plants probably made the synthesis of secondary compounds most beneficial?