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TLS Online TPP Program

#Question id: 11296

Which of the following statements is true?

#XL - R Botany
  1. Oligotrophic lakes contain more nutrients than eutrophic lakes.
  2. Xerarch succession is primary succession that occurs in salt-water environments.
  3. Most ecologists believe that most communities achieve a stable, unchanging climax vegetation.
  4. A mature ecosystem has greater species richness, greater biomass, and less net productivity than a younger stage of succession.
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TLS Online TPP Program

#Question id: 4765

#XL - R Botany

The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?
TLS Online TPP Program

#Question id: 27334

#XL - T Zoology

RNA does not contain
TLS Online TPP Program

#Question id: 5265

#XL - S Microbiology

The mechanism by which genes are transferred into bacteria via viruses is called
TLS Online TPP Program

#Question id: 355

#XL - Q Biochemistry

Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?
TLS Online TPP Program

#Question id: 5695

#XL - T Zoology

Triploids are usually autopolyploids. They arise spontaneously in nature, but they can be constructed by geneticists from the cross of a 4n (tetraploid) and a 2n (diploid). Triploids are characteristically sterile due to