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TLS Online TPP Program

#Question id: 12349

Males in a population differ in the time they spend displaying to females. A researcher hypothesizes that predators are responsible for these differences. Males display for longer durations when there are no predators in the vicinity and for shorter durations when there is a predator nearby. Which of the following study designs is the most appropriate test of this hypothesis?

#Unit 10. Ecological Principles
  1. Map predator distribution in the area; measure the abundance of females; quantify the natural variation in male display rates in areas without predators
  2. Measure display  rates of  males at  the beginning  of  the breeding season; remove all  predators from the study site; then measure male display rates later in the breeding season; repeat for multiple populations
  3. Measure display rates of males in areas with and without predators; randomly assign males to two treatments: (i) capture and release back in original area (ii) capture and switch between areas; measure display rates for all experimental males
  4. Measure display rates of males in areas with and without predators; randomly assign males to two treatments: (i) addition of females to the area (ii) removal of females from the area; measure display rates for all experimental males
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TLS Online TPP Program

#Question id: 4656

#Unit 11. Evolution and Behavior

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?
TLS Online TPP Program

#Question id: 13086

#Unit 13. Methods in Biology

Which group of VNTRs are tandem are frequently distributed in all eukaryotic genomes (except yeast) examined so far. They show a large, stable 'polymorphism due to variation in the number of repeat units and are almost 'ideal as molecular markers for genome mapping.
TLS Online TPP Program

#Question id: 11682

#Unit 7. System Physiology – Animal

A young woman is given daily injections of a substance beginning on the 16th day of her normal menstrual cycle and continuing for 3 weeks. As long as the injections continue, she does not menstruate. The injected substance could be which of the following?
TLS Online TPP Program

#Question id: 19470

#Unit 12. Applied Biology

From where did this GOX gene has been isolated from and expressed in transgenic plants?
TLS Online TPP Program

#Question id: 19822

#Unit 12. Applied Biology

Recognition of which molecules by receptor-like molecules present in resistant plants initiates several biochemical reactions?