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TLS Online TPP Program

#Question id: 4430

During splicing, an unusual type of base pairing occurs. What is it and what does it do?

#Unit 3. Fundamental Processes

  1. G to C base pairing that helps to draw the 3' end of exon 1 close to the 5' end of exon 2

  2. G to G base pairing that helps to draw the 3' end of exon 1 close to the 5' end of exon 2

  3. G to A base pairing that helps to draw the branch point close to the beginning of the intron

  4. G to G base pairing that helps to draw the branch point close to the beginning of exon 2

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TLS Online TPP Program

#Question id: 19049

#Unit 13. Methods in Biology

What is the nature of mobile phase in reverse phase chromatography? 
TLS Online TPP Program

#Question id: 7204

#Unit 5. Developmental Biology

Following statements are regarding to anterior-posterior polarity in planaria.

A. The anterior expression of Notum functions to antagonize the posteriorly produced Wnt, leading to head specification.

B. Regulation of the balance between Wnt and Notum signals may underlie not only head-tail specification but also regulation of organ size.

C. In addition, there appears to be an anterior-to-posterior gradient of Erk signaling that functions as a positive inducer of tail specification.

D. Wnt signaling achieves its repression of head regeneration by inhibiting Erk. Therefore, only in those more anterior regions lacking Wnt (due to Notum’s repression of Wnt) can Erk induce head regeneration.

Which of the following statements are incorrect?
TLS Online TPP Program

#Question id: 10643

#Unit 10. Ecological Principles

Population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02) Estimate the number of individuals added to (or lost from) a population of 1,000 individuals in one year.
TLS Online TPP Program

#Question id: 33338

#Unit 2. Cellular Organization

How does FtsZ find the cell midpoint of a rod-shaped cell?
TLS Online TPP Program

#Question id: 12469

#Unit 10. Ecological Principles

A population of strictly monogamous swans consists of 40 males and 10 females. What is the effective population size (ne) for this population?