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TLS Online TPP Program

#Question id: 11172

Consider the consequences of a harmless prey that evolves toward mimicry of a model that has an antipredator defense (Batesian mimicry). What happens to the effectiveness of this defense as more and more prey in the population are harmless mimics

#Unit 10. Ecological Principles
  1. The number of both models and mimics is unlimited because they both reinforce the protection afforded by the warning color pattern
  2. The number of mimics is limited because they dilute the protection afforded by the warning color pattern
  3. The number of mimics is unlimited because they reinforce the protection afforded by the warning color pattern
  4. The number of models is limited because they dilute the protection afforded by the warning color pattern
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TLS Online TPP Program

#Question id: 22964

#Unit 7. System Physiology – Animal

The receptor for PTH is coupled, via a 
TLS Online TPP Program

#Question id: 4682

#Unit 3. Fundamental Processes

what will happen, when repressor bound at OR1 and OR2,
TLS Online TPP Program

#Question id: 12093

#Unit 10. Ecological Principles

The resemblance of body structure and mode of life of some species of Australian marsupials to certain species of placental mammals is an example of
TLS Online TPP Program

#Question id: 12613

#Unit 10. Ecological Principles

A 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)  population of 1,000 individuals in one year. 
TLS Online TPP Program

#Question id: 7265

#Unit 5. Developmental Biology

Following statement regarding to the cascade of regulated RNA splicing controls drosophila sexual differentiation.

A. The Sex-lethal (Sxl) protein, encoded by the sex-lethal gene, is the first protein to act in the cascade and present only in female embryos.

B. Early in development, the Sxl gene is transcribed from a promoter that functions only in male embryos.

C. Later in development, this male-specific promoter is shut off, and another promoter for sex-lethal becomes active in both male and female embryos.

D. In male embryos, however, in the absence of early Sxl protein, exon 3 of the sex-lethal pre-mRNA is spliced to exon 2 to produce an mRNA that contains a stop codon early in the sequence.

Which of the following is correct?