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TLS Online TPP Program

#Question id: 4959

If a fossil is encased in a stratum of sedimentary rock without any strata of igneous rock (e.g., lava, volcanic ash) nearby, then it should be

#Unit 11. Evolution and Behavior

  1. easy to determine the absolute age of the fossil, because the radioisotopes in the sediments will not have been ʺresetʺ by the heat of the igneous rocks.

  2. easy to determine the absolute age of the fossil, because the igneous rocks will not have physically obstructed the deposition of sediment of a single age next to the fossil.

  3. difficult to determine the absolute age of the fossil, because the ʺmarker fossilsʺ common to igneous rock will be absent.

  4. difficult to determine the absolute age of the fossil, because radiometric dating of sedimentary rock is less accurate than that of igneous rock.

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TLS Online TPP Program

#Question id: 1996

#Unit 4. Cell Communication and Cell Signaling

Naturally acquired passive immunity would involve the
TLS Online TPP Program

#Question id: 11321

#Unit 10. Ecological Principles

What is a constitutive plant defense?
TLS Online TPP Program

#Question id: 14961

#Unit 8. Inheritance Biology

Drosophila females are capable of storing sperm and using it to fertilize eggs long after mating. How might this present a problem for a geneticist?
TLS Online TPP Program

#Question id: 31189

#Unit 4. Cell Communication and Cell Signaling

Which of the following are constitutively active kinases of β-catenin pathway?
a) GSK3
b) APC 
c) CK1
d) βTrCP
TLS Online TPP Program

#Question id: 15419

#Unit 5. Developmental Biology

Doris Taylor’s research group used detergents to remove all the cells from a cadaveric rat heart, which leaves behind the natural extracellular matrix. An extracellular matrix scaffold can promote the differentiation and rebuilding of a beating heart. The researchers then infused this ECM scaffold with cardiomyocytes. Now these cells differentiated and organized into a functionally contracting “recellularized” heart. Which of the following statement is correct?