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TLS Online TPP Program

#Question id: 8774

A large proportion of archaeans are extremophiles, so called because they inhabit extreme environments with high acidity, salinity, and/or temperature. Such environments are thought to have been much more common on primitive Earth. Thus, modern extremophiles survive only in places that their ancestors became adapted to long ago. Which of the following is, consequently, a valid statement about modern extremophiles, assuming that their habitats have remained relatively unchanged?

#Unit 9. Diversity of Life Forms
  1. Among themselves, they should share relatively few ancestral traits, especially those that enabled ancestral forms to adapt to extreme conditions.
  2. On a phylogenetic tree whose branch lengths are proportional to the amount of genetic change, the branches of the extremophiles should be shorter than the non-extremophilic archaeans.
  3. They should contain genes that originated in eukaryotes that are the hosts for numerous species of bacteria.
  4. They should currently be undergoing a high level of horizontal gene transfer with nonextremophilic archaeans
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TLS Online TPP Program

#Question id: 11665

#Unit 7. System Physiology – Animal

Materials are returned to the blood from the filtrate by which of the following processes?
TLS Online TPP Program

#Question id: 11460

#Unit 7. System Physiology – Animal

The round window ________.

I) dampens fluid vibrations

II) collects sound pressure waves

III) detects the frequency of sounds
TLS Online TPP Program

#Question id: 26938

#Unit 10. Ecological Principles

Which of the following statements is the most appropriate to define character displacement?
TLS Online TPP Program

#Question id: 31060

#Unit 4. Cell Communication and Cell Signaling

Active MAP kinase phosphorylates Raf on multiple sites, results: 
TLS Online TPP Program

#Question id: 5802

#Unit 8. Inheritance Biology

A wild type allele: