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TLS Online TPP Program

#Question id: 18219

Pseudoknot loop refers to 

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. Base pairing formed between loop residues within a hairpin loop and residues outside the hairpin loop
  2. Hydrogen bonded interaction formed between loop residues of two hairpin structures
  3. Interactions between loop residues of a hairpin loop and a bulge loop
  4. None of the above 
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TLS Online TPP Program

#Question id: 12330

#Unit 10. Ecological Principles

Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?
TLS Online TPP Program

#Question id: 12331

#Unit 10. Ecological Principles

The species richness of a community refers to the
TLS Online TPP Program

#Question id: 12332

#Unit 10. Ecological Principles

With a few exceptions, most of the food chains studied by ecologists have a maximum of how many links?
TLS Online TPP Program

#Question id: 12333

#Unit 10. Ecological Principles

Coral animals
TLS Online TPP Program

#Question id: 12334

#Unit 10. Ecological Principles

If a meteor impact or volcanic eruption injected a lot of dust into the atmosphere and reduced the sunlight reaching Earth's surface by 70% for one year, all of the following marine communities most likely would be greatly affected except
TLS Online TPP Program

#Question id: 12335

#Unit 10. Ecological Principles

How does the foraging of animals on tree seeds affect the distribution and abundance of the trees? This question