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TLS Online TPP Program

#Question id: 1467

Which of the following statements correctly describes a characteristic of tumor-suppressor gene?

#Unit 4. Cell Communication and Cell Signaling

  1. They are frequently overexpressed in cancerous cells.

  2. They are cancer-causing genes introduced into cells by viruses.

  3. They encode proteins that help prevent uncontrolled cell growth.

  4. They often encode proteins that stimulate the cell cycle.

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TLS Online TPP Program

#Question id: 4963

#Unit 11. Evolution and Behavior

Which free-living cells were the earliest contributors to the formation of Earthʹs oxidizing atmosphere?
TLS Online TPP Program

#Question id: 10677

#Unit 10. Ecological Principles

What interactions occur in epiphyte plants that grow on other plants?
TLS Online TPP Program

#Question id: 33375

#Unit 1. Molecules and their Interaction Relevant to Biology

How many hydrogen bonds will be present in 20 amino acid alpha helix
TLS Online TPP Program

#Question id: 15838

#Unit 8. Inheritance Biology

You are interested in a new type of autosomal dominant mutation that gives purple eyes in Drosophila. You have a true-breeding purple-eyed line carrying a mutation that you call pr-1. You have isolated a second purple-eyed mutation that you call pr-2, which you have established in a true-breeding line that also carries a recessive marker st, which gives stubby legs. You cross a fly from the pr-1 line to a fly from the st, pr-2 line producing F1 females which you then cross to males from a true breeding st line (normal eyes). From this cross, 1000 progeny flies can be categorized into four different phenotypic classes:
 
What is the distance between the st and pr genes?
TLS Online TPP Program

#Question id: 10473

#Unit 1. Molecules and their Interaction Relevant to Biology

Cleavage of beta-carotene by BCMO1 yields two molecules of :