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TLS Online TPP Program

#Question id: 1427

 In females, all the cells in a tumor have the same inactive X chromosome. The reason for this is that:

#Unit 4. Cell Communication and Cell Signaling

  1. all of the cells in a tumor are derived from a single progenitor cell.

  2. all late-stage tumors have chromosome abnormalities.

  3. multiple mutations are required for tumor induction.

  4. many tumor-suppressor genes are on the X chromosome.

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TLS Online TPP Program

#Question id: 4974

#Unit 11. Evolution and Behavior

Which of these is the most likely explanation for the modern-day distribution of dicynodont fossils?
TLS Online TPP Program

#Question id: 4975

#Unit 11. Evolution and Behavior

The observation that tusks were limited to males in several species, and were apparently not used in food-gathering, is evidence that the tusks probably
TLS Online TPP Program

#Question id: 4976

#Unit 11. Evolution and Behavior

Which of these is the most likely explanation for the existence of dicynodont fossils on modern-day Antarctica?
TLS Online TPP Program

#Question id: 5012

#Unit 11. Evolution and Behavior

A

Silurian

I

Seed plants appear

B

Devonian

II

Gymnosperms dominant

C

Carboniferous

III

Invasion of land by primitive land plants

D

Jurassic

IV

first reptiles
TLS Online TPP Program

#Question id: 5014

#Unit 11. Evolution and Behavior

 Following geological time period and major evolutionary event?

I. Devonian                            A. Gymnosperms dominant

II. Jurassic                               B. Amphibians diversify; first reptiles

III. Carboniferous                  C. Mammals appear

IV. Triassic                           D. Seed plants appear
TLS Online TPP Program

#Question id: 5015

#Unit 11. Evolution and Behavior

 During which of the following largest mass extinction recorded in the history of life on Earth.